Java Programming
Java Programming
QUESTIONS
& SOLUTIONS
- Write a program to display the greatest of the given 3
numbers. (ifelse.java)
class ifelse
{
public static void main(String args[])
{
int a = 325, b = 712, c = 478;
System.out.print("Largest Value is :");
if (a > b)
{
if (a > c)
{
System.out.println(a);
}
else
{
System.out.println(c);
}
}
else
{
if (c > b)
{
System.out.println(c);
}
else
{
System.out.println(b);
}
}
}
}
2.
Write a program to display the season given the month using
switch case. (switchcs.java)
class switchcs
{
public static void main(String args[])
{
int mth = 4;
String season;
switch(mth)
{
case 12:
case 1:
case 2:
season = "Winter";
break;
case 3:
case 4:
case 5:
season = "Spring";
break;
case 6:
case 7:
case 8:
season = "Summer";
break;
case 9:
case 10:
case 11:
season = "Autumn";
break;
default:
season = "Invalid Month";
}
System.out.println("April is in the " + season +
".'");
}
}
3.
Write a program to illustrate multiple inheritance to display
the student’s marks and the sports details. (mltinh.java)
class student
{
int rollno;
void getnum(int n)
{
rollno = n;
}
void putnum()
{
System.out.println("Roll NO. :"+rollno);
}
}
class test extends student
{
float sub1, sub2;
void getmrks(float m1, float m2)
{
sub1 = m1;
sub2 = m2;
}
void putmks()
{
System.out.println("Marks Obtained");
System.out.println("Subject 1 =
" + sub1);
System.out.println("Subject 2 =
" + sub2);
}
}
interface sports
{
float spwt = 6.0F;
void putWt();
}
class Results extends test
implements sports
{
float total;
public void putWt()
{
System.out.println("Sports Wt = " + spwt);
}
void disp()
{
float tot = sub1+sub2+spwt;
putnum();
putmks();
putWt();
System.out.println("Total Score = " + tot);
}
}
class mltinh
{
public static void main(String args[])
{
Results stu1 = new Results();
stu1.getnum(1234);
stu1.getmrks(27.5F, 63.0F);
stu1.disp();
}
}
4.
Write a program to illustrate the checkbox of the swing
component. (chkbox.java)
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
//<applet code=chkbox height=400
width=400></applet>
public class chkbox extends Applet
implements ItemListener
{
Checkbox cb1,cb2,cb3;
String msg = " ";
public void init()
{
cb1 = new Checkbox("Computers");
cb2 = new Checkbox("Management");
cb3 = new Checkbox("Arts");
add(cb1);
add(cb2);
add(cb3);
cb1.addItemListener(this);
cb2.addItemListener(this);
cb3.addItemListener(this);
}
public void itemStateChanged(ItemEvent ie)
{ repaint(); }
public void paint(Graphics g)
{
msg = "Current State
:";
g.drawString(msg,6,80);
msg = "Computers : " + cb1.getState();
g.drawString(msg,6,100);
msg = "Management : " +
cb2.getState();
g.drawString(msg,6,120);
msg = "Arts : " + cb3.getState();
g.drawString(msg,6,140);
}
}
5.
Write a program to create a moving banner. (banner.java)
/* Write an applet program to create
a thread that scrolls the message */
import java.awt.*;
import java.applet.*;
/*public class banner extends Applet
{
public void init()
{ setBackground(Color.cyan);
}
public void paint(Graphics g)
{
g.drawString("This is in the Applet Window",10,20);
showStatus("This is in the Status Window");
}
}
*/
public class banner extends Applet
implements Runnable {
String msg = "A Moving Banner";
Thread t = null;
int st;
boolean stopflag;
public void init()
{ setBackground(Color.cyan);
setForeground(Color.blue);
}
public void start()
{
t = new Thread(this);
stopflag = false;
t.start();
}
public void run()
{
char ch;
for(; ;)
{
try
{
repaint();
Thread.sleep(250);
ch = msg.charAt(0);
msg =
msg.substring(1,msg.length());
msg += ch;
if(stopflag)
break;
}
catch(InterruptedException e) {}
}
}
public void stop()
{
stopflag = true;
t = null;
}
public void paint(Graphics g)
{
g.drawString(msg,50,30);
}
}
6.
Write a program to display stars * as shown using continue and
break statements. (contbr.java)
*
* *
.....
.....
* * * * * * * * * *
class contbr
{
public static void main(String args[])
{
LOOP1 : for(int i = 1; i <
100; i++)
{
System.out.println("
");
if (i >= 10) break;
for (int j = 1; j <=i; j++)
{
System.out.print("*");
if (j == i)
continue LOOP1;
}
}
System.out.println("Teminated
by Break");
}
}
7.
Write a program to display the following using for loop: (forloop.java) 1
2 2
.....
.....
9 9 9 9 9 9 9 9 9
class forloop
{
public static void main(String args[])
{
System.out.println("Screen Display");
for(int i = 1; i <= 9; i++)
{
for(int j = 1; j <= i; j++)
{
System.out.print(i);
if(i==j)
System.out.println(" ");
}
}
}
}
8. Write a prgram to draw applet using control loop. (ctrloop.java)
import java.awt.*;
import java.applet.*;
public class ctrloop extends Applet
{
public void paint(Graphics g)
{
for(int i = 0; i <= 5; i ++)
{
if (i%2 == 0)
g.drawOval(120,i*60+10,50,50);
else
g.fillOval(120,i*60+10,50,50);
}
}
}
9.
Create an applet to draw a polygon with one half as solid.
(poly.java)
import java.awt.*;
import java.applet.*;
public class poly extends Applet
{
int x1[] = {20,120,220,20};
int y1[] = {20,120,20,20};
int n1 = 4;
int x2[] = {120,220,220,120};
int y2[] = {120,20,220,120};
int n2 = 4;
public void paint(Graphics g)
{
g.drawPolygon(x1,y1,n1);
g.fillPolygon(x2,y2,n2);
}
}
10.
Write a program to accept values as datainputstream and
calculate and print the interest amount using wrapper Classes. (wrapcls.java)
import java.io.*;
class wrapcls
{
public static void main(String args[])
{
Float pamt = new Float(0);
Float inrt = new Float(0);
int nyrs = 0;
try
{
DataInputStream in = new
DataInputStream(System.in);
System.out.print("Enter
Principal Amount :");
System.out.flush();
String pstr = in.readLine();
pamt = Float.valueOf(pstr);
System.out.print("Enter Rate Of
Interest :");
System.out.flush();
String rstr = in.readLine();
inrt = Float.valueOf(rstr);
System.out.print("Enter No. of
Years :");
System.out.flush();
String ystr = in.readLine();
nyrs = Integer.parseInt(ystr);
}
catch(IOException e)
{
System.out.println("I/O
Error");
System.exit(1);
}
float finval = loan(pamt.floatValue(),inrt.floatValue(),nyrs);
prtln();
System.out.println("Final Value
=" + finval);
prtln();
}
static float loan(float p, float r, int n)
{
int yr = 1;
float sum = p;
while(yr <= n)
{
sum = sum * (1 + r);
yr = yr + 1;
}
return sum;
}
static void prtln()
{
for(int i = 1; i <= 50; i++)
{
System.out.print("*");
}
System.out.println("
");
}
}
11. Create an applet to draw
a human face. (humface.java)
import java.awt.*;
import java.applet.*;
public class humface extends Applet
{
public void paint(Graphics g)
{
g.drawOval(40,40,120,150);
g.drawOval(57,75,30,20);
g.drawOval(110,75,30,20);
g.fillOval(68,81,10,10);
g.fillOval(121,81,10,10);
g.drawOval(85,100,30,30);
g.fillArc(60,125,80,40,180,180);
g.drawOval(25,92,15,30);
g.drawOval(160,92,15,30);
}
}
12. Write a program to
display the URL details using java.net
package. (urldemo.java)
import java.net.*;
class urldemo
{
public static void main(String args[]) throws MalformedURLException
{
URL hp = new URL("http://www.osborne.com/download");
System.out.println("Protocol : " + hp.getProtocol());
System.out.println("Port
: " + hp.getPort());
System.out.println("Host
: " + hp.getHost());
System.out.println("File
: " + hp.getFile());
System.out.println("Ext
: " + hp.toExternalForm());
}
}
13. Write a program to copy
the contents one file to another. (fcopy.java,source.txt)
import java.io.*;
class fcopy
{
public static void main(String args[]) throws
IOException
{
int i;
FileInputStream fin;
FileOutputStream fout;
try
{
try
{ fin = new FileInputStream(args[0]); }
catch(FileNotFoundException e)
{
System.out.println("Input File
Not Found");
return;
}
try
{ fout = new FileOutputStream(args[1]); }
catch(FileNotFoundException e)
{
System.out.println("Error Opening
Output File");
return;
}
}
catch(ArrayIndexOutOfBoundsException e)
{
System.out.println("Usage :
CopyFile From To");
return;
}
try
{
do{
i= fin.read();
if(i != -1) fout.write(i);
} while(i != -1);
}
catch(IOException e)
{
System.out.println("File Error");
}
fin.close();
fout.close();
}
}
content of source.txt :
This is a sample text file for
demonstrating
the input output process to copy
from one file to another.
14. Write an applet program
for user interface to accept values and display the sum. (inapt.java)
import java.io.*;
import java.applet.*;
import java.awt.*;
//<applet code=Inapt height=400
width=400></applet>
public class Inapt extends Applet
{
TextField t1,t2;
public void init()
{
t1 = new TextField(5);
t2 = new TextField(5);
add(t1);
add(t2);
t1.setText("0");
t2.setText("0");
}
public void paint (Graphics g)
{
int x = 0, y = 0, z = 0;
String s1,s2,s;
g.drawString("Input numbers in the text boxes", 10,50);
try
{
s1 = t1.getText();
x = Integer.parseInt(s1);
s2 = t2.getText();
y = Integer.parseInt(s2);
}
catch (Exception ex) {}
z = x + y;
s = String.valueOf(z);
g.drawString("The sum is :",10,75);
g.drawString(s,100,75);
}
public boolean action(Event event, Object obj)
{
repaint();
return true;
}
}
15. Write a servlet to
initialise the counter. (Simplecounter.java)
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SimpleCounter extends
HttpServlet
{
int count=0;
public void doGet (HttpServletRequest req,
HttpServletResponse res)
throws ServletException,
IOException
{
res.setContentType("text/plain");
PrintWriter out = res.getWriter();
count++;
out.println("fine loading this
Servlet has been
added" +
count+"times");
}
}
16. Write a program to create
a class with simple properties. (simprop.java)
public class simprop
{
private float amplitude,frequency,phase;
public simprop()
{
amplitude=0f;
frequency=100f;
phase=0f;
}
public float getAmplitude()
{
return amplitude;
}
public void setAmplitude(float Amplitude)
{
this.amplitude= Amplitude;
}
public float getfrequency()
{
return frequency;
}
public void setFrequency(float frequency)
{
this.frequency=frequency;
}
public float getPhase()
{
return phase;
}
public void setPhase(float phase)
{
this.phase=phase;
}
}
17.
Write a program to
create an applet to draw a lamp. (lamp.java)
/*program to draw a lamp*/
import java.awt.*;
import java.awt.Color;
public class lamp extends
java.applet.Applet
{
public void init()
{
resize(300,300);
}
public void paint(Graphics g)
{
g.setColor(Color.red);
g.fillRect(0,250,290,290);
g.drawLine(125,250,125,160);
g.drawLine(175,250,175,160);
g.drawArc(85,157,130,50,-65,312);
g.drawArc(85,87,130,50,62,58);
g.drawLine(85,177,119,89);
g.drawLine(215,177,181,89);
g.setColor(Color.blue);
g.fillArc(78,120,40,40,63,-174);
g.fillOval(120,96,40,40);
g.fillArc(173,100,40,40,110,180);
}
}
18. Write a program to create
an applet to draw a moving banner. (banr.java)
/*program to display a moving
banner*/
import java.lang.String;
import java.awt.*;
import java.awt.Color;
import java.applet.*;
public class banr extends Applet
implements Runnable
{
String msg; Thread t = null;
public void init()
{
setBackground(Color.cyan);
setForeground(Color.red);
msg = "java makes the web
move";
}
public void start()
{
if(t==null)
t = new Thread (this);
t.start();
}
public void stop()
{
if(t!=null)
{
t.stop();
t = null;
}
}
public void run ()
{
char ch;
for(; ;) {
try {
repaint (); Thread.sleep(350); ch = msg.charAt(0);
msg = msg.substring(1, msg.length()); msg +=ch;}
catch(InterruptedException e) {}
}
}
public void paint(Graphics g)
{
g.drawString (msg, 100,100);
}
}
19. Write a program to create
an applet to display a scrollbar. (scroll.java)
/*The Scrollbar object:*/
import java.awt.*;
import java.applet.*;
public class scroll extends Applet
{
Scrollbar s=new
Scrollbar(Scrollbar.HORIZONTAL,50,100,0,100);
Label l=new Label ("choose your
tax rate");
TextField t=new
TextField("50%", 3);
public void init()
{
add(s);
add(l);
add(t);
}
public boolean handleEvent (Event e)
{
if (e.target instanceof Scrollbar)
{
int
taxrate=((Scrollbar)e.target).getValue();
t.setText(taxrate + "%");
return true;
}
return false;
}
}
20. Write a program to create
an applet to display a growing text. (marquee.java)
/*The program below illustrates a
growing marquee in which the font size of the character grow and fall.*/
import java.awt.*;
import java.lang.*;
import java.applet.*;
public class marquee extends Applet
implements Runnable
{
Thread t; int x,y,f; String msg;
public void init()
{
x=10; y=100; f=5; msg="this is
a growing marquee";}
public void start ()
{
t=new Thread(this);
t.start ();
}
public void run ()
{
for(;;)
{
try{Thread.sleep(300);
}
catch(InterruptedException e) {}
repaint ();
}
}
public void stop ()
{
t.stop ();
}
public void paint (Graphics g)
{Font newFont=new
Font("TimesRoman", Font.BOLD, f);
g.setFont (newFont);
FontMetrics fontmetrics
=g.getFontMetrics ();
int
width=fontmetrics.stringWidth(msg);
g.drawString (msg,x,y);
f+=2;
if(f>50) f=2;
}
}
21. Write a program to create
an applet to display a bouncing ball. (ball.java)
/*The program below is intended to
illustrate the bounching ball
animation.*/
import java.applet.*;
import java.awt.*;
public class ball extends Applet
implements Runnable
{
Thread mythread;
private
int bx, by, my=200, mx=400;
int bdia = 50; int incx = 10; int incy
=10;
public void start()
{
if (mythread ==null)
{
mythread = new Thread (this);
mythread.start ();
}
}
public void stop()
{
if(mythread != null)
{
mythread.stop();
mythread = null;
}
}
public void run()
{
while (true)
{
repaint();
bx += incx;
if (bx > mx || bx < 10)
{
incx *= -1;
bx +=2*incx;
}
by += incy;
if (by > mx || by < 1)
{
incy *= -1;
by +=2*incy;
}
try{Thread.sleep(25);
}
catch(InterruptedException e) {}
}
}
public void paint (Graphics g)
{
g.setColor(Color.white);
g.fillOval (bx,by, bdia, bdia);
}}
22. Write a program to create
an applet to display check boxes to select font size and display the text.
(check.java)
/*Program to change the font size of
the given text using check boxs*/
import java.awt.*;
public class check extends
java.applet.Applet
{
final String str8="8";
final String str14="14";
final String str24="24";
final String str32="32";
Integer intFontSize;
public static void main (String
args[])
{
Frame f=new
Frame("CHECKBOXES");
f.add("Center", new
check());
f.resize (300, 150);
f.show ();
}
public check()
{
CheckboxGroup cbg=new
CheckboxGroup();
add(new Checkbox(str8));
add(new Checkbox(str14));
add(new Checkbox(str24));
add(new Checkbox(str32));
intFontSize = new Integer(str8);
}
public boolean action (Event e,
Object arg)
{
if(e.target instanceof Checkbox)
{
Checkbox
checkbox=(Checkbox)e.target;
intFontSize=Integer.valueOf(checkbox.getLabel());
repaint ();
}
return true;
}
public void paint(Graphics g)
{
Font f=new Font
("TimesRoman", Font.BOLD,intFontSize.intValue());
g.setFont(f);
g.drawString("Hello
World", 50,75);
}
}
23. Write a program to create
an applet to copy text from one textarea to another. (copytext.java)
/*The program to copy a selected
text from one text area to another text area.*/
import java.awt.*;
import java.applet.*;
public class copytext extends Applet
{
private TextArea t1, t2;
private Button b;
public void init ()
{
String s="Internet is a
collection of individual data\n" +
"networks
connected together in such a way\n"+
"that data can be transmitted back
and forth\n"+
"between any one individual
network\n"+
"and any other individual data
network";
t1=new TextArea(5,20);
t1.setText(s);
t2=new TextArea(5,50);
b=new
Button("copy>>>");
setLayout(new
FlowLayout(FlowLayout.LEFT, 5,5));
add(t1);
add(b);
add(t2);
}
public boolean action (Event e,
Object o)
{
if (e.target==b)
{
t2.setText(t1.getSelectedText());
return true;
}
return false;
}
}
24. Write a program to create
an applet to display a piechart. (piechart.java)
/*The program to draw a piechart.*/
import java.applet.*;
import java.awt.*;
public class piechart extends Applet
{
final static int dataset[] = {20,
30, 40, 10};
final static String datalabel[] =
{"apples", "oranges", "bananas",
"others"};
final static Color datacolor[] =
{Color.red, Color.blue, Color.green, Color.yellow};
int graphoffset = 20;
int graphdia = 150;
public void paint (Graphics g)
{
int startangle = 0, piesize;
int subtotal = 0;
for (int i = 0; i<dataset.length;
i++)
{subtotal += dataset[i];
piesize = subtotal*360/100 -
startangle;
g.setColor(datacolor[i]);
g.fillArc(graphoffset, graphoffset,
graphdia, graphdia, startangle, piesize);
startangle += piesize;
g.fillRect(graphoffset+ graphdia
+10,graphoffset +i*20, 15, 15);
g.setColor(Color.black);
g.drawString(datalabel[i],graphoffset+graphdia+10+20,graphoffset+i*20+15);
}
}
}
25. Write a program to create
an applet to display a system date/time as a string. (strings.java)
/*Drawing strings*/
import java.awt.Graphics;
import java.util.Date;
public class strings extends java.applet.Applet
{
String then;
public void init ()
{
Date now;
now=new Date ();
then=now.toString() ;
}
public void paint (Graphics g)
{
g.drawString ("Today's Date is
:"+ then,10 ,10);
}
}
26. Write a program to create
a thread and display the time elapsed. (thread.java)
/*A Single threaded Java Program*/
class thread
{
public static void main(String args[])
{
long
start = System.currentTimeMillis();
Thread t =
Thread.currentThread();
System.out.println("CurrentThread"+t);
t.setName("My
Thread");
System.out.println("Current Thread :"+t);
try
{
for(int
n=5; n>0; n--)
{
System.out.println(""+n);
Thread.sleep(1000);
}
}
catch(InterruptedException e)
{
System.out.println("Interrupted");
}
System.out.println("No
Interruption has occurred");
long
end = System.currentTimeMillis();
System.out.println("Elapsed Time
is"+(end-start));
}
}
27. Write a program to create
an applet to display fonts of different sizes. (font.java)
/*Font class providing different
font types in different sizes */
import java.awt.*;
import java.applet.*;
public class font extends Applet
{
public void paint (Graphics g)
{
String fontlist[] =
getToolkit().getFontList();
for (int i = 0; i <
fontlist.length; i++)
{ Font f = new Font (fontlist[i],
Font.BOLD, 16+1*4);
g.setFont(f);
g.drawString (fontlist[i] + (16+i*4)
+ " point", 5, i*35 + 20);}
}
}
28. Write a program to demonstrate
thread priority. (TestThread.java)
// Explains Priority Of A THread
class TestingThread extends Thread
{
Thread MinThread,MaxThread,NormThread;
int i=0;
TestingThread()
{
MinThread = new Thread("min");
MinThread.setName("min");
MinThread.setPriority(Thread.MIN_PRIORITY);
MaxThread = new Thread("max");
MaxThread.setName("Max");
MaxThread.setPriority(Thread.MAX_PRIORITY);
NormThread = new Thread("norm");
NormThread.setName("Norm");
NormThread.setPriority(Thread.NORM_PRIORITY);
start();
}
public void run()
{
try
{
for(i=0;i<5;i++)
{
System.out.println(" Thread \t\t"
+Thread.currentThread());
Thread.sleep(100);
}
}
catch(InterruptedException e){}
}
}
public class TestThread
{
public static void main(String s[])
{
TestingThread t1 = new TestingThread();
TestingThread t2=new TestingThread();
TestingThread t3=new TestingThread();
}
}
29. Write a program to create
an applet to display message in the status bar. (status.java)
/* Write an applet program to
message in status bar*/
import java.awt.*;
import java.applet.*;
public class status extends Applet
{
public void init()
{ setBackground(Color.cyan);
}
public void paint(Graphics g)
{
g.drawString("This is in the Applet Window",10,20);
showStatus("This is in the Status Window");
}}
30. Write a program to create
an applet to display tabbedpanel. (tabbedpanel.java)
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class tabbedpanel extends JPanel
{
String tabs[]=
{"One","Two","Three","Four"};
public JTabbedPane tabbedPane = new JTabbedPane();
public tabbedpanel()
{
setLayout(new BorderLayout());
for(int i=0;i<tabs.length;i++)
tabbedPane.addTab(tabs[i], null,createPane(tabs[i]));
tabbedPane.setSelectedIndex(0);
add(tabbedPane,BorderLayout.CENTER);
}
JPanel createPane(String s)
{
JPanel p = new JPanel();
p.add(new JLabel(s));
return p;
}
public static void main(String args[])
{
JFrame frame = new JFrame("Tabbed Pane Example");
frame.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
frame.getContentPane().add(new tabbedpanel(),BorderLayout.CENTER);
frame.setSize(400,125);
frame.setVisible(true);
}
}
31. Write a program to
display 9 * one below the other using 2 for loop and a continue and break
statements. (contbr1.java)
class contbr1
{
public static void main(String args[])
{
LOOP1 : for(int i = 1; i <
100; i++)
{
System.out.println("
");
if (i >= 10) break;
for (int j = 1; j <=i; j++)
{
System.out.print("*");
if (j == 1)
continue LOOP1;
}
}
System.out.println("Teminated
by Break");
}
}
32. Write a program to print
the column details using resultsetmetadata and jdbc.
(eight.java,
printcolumntypes.java)
eight.java
import java.sql.*;
public class eight
{
public static void main(String args[])
{
String url="jdbc:odbc:MyData";
Connection con;
String query="select * from
stud1";
Statement stmt;
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(java.lang.ClassNotFoundException e)
{
System.err.print("ClassNotFoundException:");
System.err.print(e.getMessage());
}
try
{
con=DriverManager.getConnection(url);
stmt=con.createStatement();
ResultSet rs=stmt.executeQuery(query);
ResultSetMetaData rsmd=rs.getMetaData();
//PrintColumnTypes.printColTypes(rsmd);
System.out.println(" ");
int noc=rsmd.getColumnCount();
for(int i=1;i<=noc;i++)
{
if(i>1)
System.out.println("");
String columnName=rsmd.getColumnName(i);
System.out.println(columnName);
}
System.out.println("");
while(rs.next())
{
for(int i=1;i<noc;i++)
{
if(i>1)
System.out.println("");
String columnValue=rs.getString(i);
System.out.println(columnValue);
}
System.out.println("");
}
stmt.close();
con.close();
}
catch(SQLException ex)
{
System.err.print("SQLException");
System.err.println(ex.getMessage());
}
}
}
printcolumntypes.java
import java.sql.*;
public class PrintColumnTypes
{
public static void main(String args[])
{
String url="jdbc:odbc:MyData";
Connection con;
String query="select * from
Stud1";
Statement stmt;
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(java.lang.ClassNotFoundException e)
{
System.err.print("ClassNotFoundException:");
System.err.print(e.getMessage());
}
try
{
con=DriverManager.getConnection(url);
stmt=con.createStatement();
ResultSet rs=stmt.executeQuery(query);
ResultSetMetaData rsmd=rs.getMetaData();
int noc=rsmd.getColumnCount();
for(int i=1;i<=noc;i++)
{
int jdbcType=rsmd.getColumnType(i);
String name=rsmd.getColumnTypeName(i);
System.out.println("Column
"+i+"is JDBC
type"+jdbcType);
System.out.println(", Which the DBMS
Calls"+name);
}
stmt.close();
con.close();
}
catch(SQLException ex)
{
System.err.print("SQLException");
System.err.println(ex.getMessage());
}
}
}
33. Write a program to update
a column using setAutoCommit (false). (fifth.java)
import java.sql.*;
import java.util.*;
public class fifth
{
static int sno;
static String sc,sname;
public static void main(String args[])
{
try
{
Class.
forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(java.lang.ClassNotFoundException e)
{
System.err.print("ClassNotFoundException:");
System.err.print(e.getMessage());
}
try
{
String url="jdbc:odbc:MyData";
Connection
con=DriverManager.getConnection(url);
Statement stmt=con.createStatement();
String sql="select * from
stud1";
ResultSet rs=stmt.executeQuery(sql);
con.setAutoCommit(true);
System.out.println("autocommit set
true");
while(rs.next())
{
sno
=rs.getInt("Regno");
sname=rs.getString("Name");
sc
=rs.getString("Course");
System.out.println(sno+" "+sname+" "+sc);
}
PreparedStatement updatesc;
String updateString="update Stud1 set Course='"
+"Java'" + "where
RegNo=101";
updatesc=con.prepareStatement(updateString);
System.out.println("Updated");
updatesc.executeUpdate();
String sql1="select * from stud1";
ResultSet rsl=stmt.executeQuery(sql1);
System.out.println("updated Data");
while(rsl.next())
{
sno=rsl.getInt("Regno");
sname=rs.getString("Name");
sc=rs.getString("Course");
System.out.println(sno+" "+sname+" "+sc);
}
}
catch(SQLException e)
{
System.err.print("SQLException");
System.out.println(e);
System.exit(0);
}
}
}
34. write a program to
display the column names from the query which has been given as the command
line argument. (fourth.java)
import java.sql.*;
import java.util.*;
class fourth
{
public static void main(String args[])
{
if(args.length!=1)
{
System.out.println("usage of java
application
sql");
System.exit(0);
}
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(java.lang.ClassNotFoundException e)
{
System.err.print("ClassNotFoundException:");
System.err.print(e.getMessage());
}
try
{
String url="jdbc:odbc:MyData";
Connection con =
DriverManager.getConnection(url);
Statement stmt=con.createStatement();
String sql=args[0];
System.out.println(sql);
boolean hasResults=stmt.execute(sql);
if(hasResults)
{
ResultSet rs=stmt.executeQuery(sql);
if(rs!=null)
{
ResultSetMetaData rmeta =
rs.getMetaData();
int numcolumns =
rmeta.getColumnCount();
for(int i=1;i<=numcolumns;i++)
System.out.print(rmeta.getColumnName(i)
+" ");
}
}
con.close();
}
catch(Exception e)
{
System.err.print("SQLException");
System.out.println(e);
System.exit(0);
}
} //main
}
35. Write a program to
display the types of table available in the RDBMS that you are using, with the
help of databasemetadata. (ninth.java)
import java.sql.*;
public class ninth
{
public static void main(String args[])
{
String url="jdbc:odbc:MyData";
Connection con;
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(java.lang.ClassNotFoundException e)
{
System.err.print("ClassNotFoundException:");
System.err.print(e.getMessage());
}
try
{
con=DriverManager.getConnection(url);
DatabaseMetaData
dbmd=con.getMetaData();
String
dbmsName=dbmd.getDatabaseProductName();
ResultSet rs=dbmd.getTableTypes();
System.out.print("The following
types of table
are");
System.out.println("available
in" + dbmsName + "
:" );
while(rs.next())
{
String
tableType=rs.getString("TABLE_TYPE");
System.out.println(" "+tableType);
}
rs.close();
con.close();
}
catch(SQLException e)
{
System.err.print("SQLException:"+e.getMessage());
}
}
}
36.
Write a program to swap the strings in ascending order. (swapstr.java)
class swapstr
{
static String name[] =
{"Chennai", "Mumbai", "Delhi",
"Agra","Patna"};
public static void main(String args[])
{
int size = name.length;
String temp = null;
for(int i = 0; i < size; i++)
{
for(int j = i+1; j < size;
j++)
{
if(name[j].compareTo(name[i])
< 0)
{
temp = name[i];
name[i] = name[j];
name[j] = temp;
}
}
}
for(int i = 0; i < size; i++)
{
System.out.println(name[i]);
}
}
}
37. Write a program to
display date using servlets. (DatePrintServlet.java)
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.text.*;
import java.util.*;
public class DatePrintServlet
extends HttpServlet
{
public void service(HTTPServletRequest
req,HTTPServletResponse res)throws IOException
{
String sToday;
Date today;
serveltOutPutStream out;
today=new Date();
stoday=DateFormat.getDateInstance().format(today);
res.setContentType("text/plain");
out=res.getOutputStream();
out.print(stoday);
}
public String getServletInfo()
{
return "Return an in-line formatted representation of
the current date";
}
}
38. Write a program to create
an applet to receive parameters and display the string. (appletparam.java,
appletparam.html)
appletparam.java
import java.awt.*;
import java.applet.*;
public class Appletparam extends
Applet
{
String str;
public void init()
{
str=getParameter("string");
if (str == null)
str = "Java";
str = "Hello" + str;
}
public void paint(Graphics g)
{
g.drawString(str,10,100);
}
}
appletparam.html
<applet code=Appletparam.class
height=400 width=400>
<param name="string"
value="US">
</applet>
********
39. Write a program to illustrate the use of classes and calculate the
electricity bill with the given readings. (electricity.java)
class Electricity
{
int Cno,Cmr,Pmr,Uc;
double Ba;
String CName, Remark;
public static void main(String
args[])
{
int
a,c,d,NCode;
String
b, Scode;
char
ACode[], CCode;
a=Integer.parseInt(args[0]);
b=args[1];
c=Integer.parseInt(args[2]);
d=Integer.parseInt(args[3]);
Scode=args[4];
ACode=Scode.toCharArray();
CCode=ACode[0];
if(Character.isDigit(CCode))
{
NCode=Integer.parseInt(args[4]);
Electricity
Eb=new Electricity(a,b,c,d,NCode);
Eb.ShowBill();
}
else
{
Electricity
Eb=new Electricity(a,b,c,d,CCode);
Eb.ShowBill();
}
}
Electricity(int a, String b, int c,
int d, char CCode)
{
System.out.println("Numeric
Code Constructor");
Cno=a;
CName=b;
Cmr=c;
Pmr=d;
Uc=c-d;
if(CCode=='F' ||
CCode=='f')
{
Ba=(double)Uc * 15;
Remark="Farmer";
}
else if(CCode=='D' ||
CCode=='d')
{
Ba=(double)Uc * 1;
Remark="Domestic";
}
else
{
Ba=(double)Uc
* 1.5;
Remark="Commercial";
}
//ShowBill();
}
Electricity(int a, String b, int c,
int d, int NCode)
{
System.out.println("Numeric
Code Constructor");
Cno=a;
CName=b;
Cmr=c;
Pmr=d;
Uc=c-d;
if(NCode==1)
{
Ba=(double)Uc
* 15;
Remark="Farmer";
}
else if(NCode==2)
{
Ba=(double)Uc
* 1;
Remark="Domestic";
}
else
{
Ba=(double)Uc
* 1.5;
Remark="Commercial";
}
//ShowBill();
}
void ShowBill()
{
System.out.println("Cno :"+Cno);
System.out.println("Cname :"+CName);
System.out.println("Cmr :"+Cmr);
System.out.println("Pmr :"+Pmr);
System.out.println("UC :"+Uc);
System.out.println("BA :"+Ba);
System.out.println("Remark :"+Remark);
}
}
40. Write a program to print
the student details using JDBC. (first.java)
import java.sql.*;
import java.util.*;
class first
{
static int sno;
static String sc,sname,rem;
public static void main(String args[])
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:MyData";
Connection con=DriverManager.getConnection(url);
Statement stmt=con.createStatement();
String sql="select * from stud1";
ResultSet rs=stmt.executeQuery(sql);
while(rs.next())
{
sno=Integer.parseInt(rs.getString("RegNo"));
sname=(rs.getString("Name"));
sc=(rs.getString("Course"));
System.out.println(sc);
System.out.println(" Course Report
");
System.out.println(" ================= ");
System.out.println(" Student No
:"+ sno);
System.out.println(" Name :"+ sname);
System.out.println(" Course :"+ sc);
System.out.println(" ================= ");
}
}
catch(Exception e)
{
System.out.println(e);
System.exit(0);
}
}
}
41.
Write a program to Illustrate slider panel. (slider.java)
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JSlider;
import java.util.Hashtable;
public class Slider extends JPanel
{
public Slider()
{
setLayout(new
BorderLayout());
JSlider
Right, Bottom;
Right
= new JSlider(0,1,10,10);
Hashtable
H = new Hashtable();
H.put(new
Integer (1), new JLabel("Java 2.0"));
H.put(new
Integer (2), new JLabel("Html"));
H.put(new
Integer (3), new JLabel("Dhtml 2.0"));
H.put(new
Integer (4), new JLabel("Swing 2.0"));
H.put(new
Integer (5), new JLabel("Servlt 2.0"));
H.put(new
Integer (6), new JLabel("Jdbe"));
H.put(new
Integer (7), new JLabel("Perl"));
H.put(new
Integer (8), new JLabel("CGI"));
H.put(new
Integer (9), new JLabel("VBSript"));
Right.setLabelTable(H);
Right.setPaintLabels(true);
Right.setInverted(true);
Bottom
= new JSlider(1,0,100,50);
Bottom.setMajorTickSpacing(10);
Bottom.setPaintLabels
(true);
add(Right,
BorderLayout.EAST);
add(Bottom,
BorderLayout.SOUTH);
//
Right.add(BorderLayout.EAST);
//
Bottom.add(BorderLayout.SOUTH);
}
public static void main(String[] args)
{
JFrame frame = new JFrame("COMPUTER
COUCH");
frame.addWindowListener(new
WindowAdapter()
{
public void windowClosing
(WindowEvent e)
{
System.exit(0);
}
});
frame.setContentPane(new Slider());
frame.pack();
frame.setVisible(true);
}
}
42. Write a progrma to demonstrate menus in java using
swing. (MenuDemo.java)
import
java.awt.*;
import
java.awt.event.*;
import
javax.swing.*;
import javax.swing.event.*;
public class
MenuDemo extends JFrame
{
public static int WIDTH = 300;
public static int HEIGHT = 300;
public static String TITLE =
"MenuDemo";
Container frameContainer;
// Swing components
JLabel label=new JLabel("Welcome to MenuDemo");
JMenuBar menuBar = new JMenuBar();
JMenu fileMenu = new JMenu("File");
JMenuItem fileNew = new
JMenuItem("New");
JMenuItem fileOpen = new
JMenuItem("Open");
JMenuItem fileSave = new
JMenuItem("Save");
JMenuItem fileExit = new JMenuItem("Exit");
JMenu specialMenu = new
JMenu("Properties");
JCheckBoxMenuItem specialCheck1 = new
JCheckBoxMenuItem("Bold");
JCheckBoxMenuItem specialCheck2 = new
JCheckBoxMenuItem("Italic");
JSeparator separator = new JSeparator();
JRadioButtonMenuItem specialRadio1 = new
JRadioButtonMenuItem("Red");
JRadioButtonMenuItem specialRadio2 = new
JRadioButtonMenuItem("Blue");
JRadioButtonMenuItem specialRadio3 = new
JRadioButtonMenuItem("Green");
ButtonGroup buttonGroup = new ButtonGroup();
public MenuDemo()
{
super(TITLE);
buildGUI();
label.setFont(new
Font("TimesRoman",Font.PLAIN,20));
setupEventHandlers();
setSize(WIDTH,HEIGHT);
show();
}
void buildGUI()
{
setupMenuBar();
layoutComponents();
}
void setupMenuBar()
{
fileMenu.add(fileNew);
fileMenu.add(fileOpen);
fileMenu.add(fileSave);
fileMenu.add(fileExit);
specialMenu.add(specialCheck1);
specialMenu.add(specialCheck2);
specialMenu.add(separator);
buttonGroup.add(specialRadio1);
buttonGroup.add(specialRadio2);
buttonGroup.add(specialRadio3);
specialMenu.add(specialRadio1);
specialMenu.add(specialRadio2);
specialMenu.add(specialRadio3);
menuBar.add(fileMenu);
menuBar.add(specialMenu);
setJMenuBar(menuBar);
}
public void layoutComponents()
{
frameContainer = getContentPane();
frameContainer.setLayout(null);
label.setBounds(25,75,300,40);
frameContainer.add(label);
}
void setupEventHandlers()
{
addWindowListener(new WindowHandler());
fileNew.addActionListener(new
MenuItemHandler());
fileOpen.addActionListener(new
MenuItemHandler());
fileSave.addActionListener(new
MenuItemHandler());
fileExit.addActionListener(new
MenuItemHandler());
specialCheck1.addItemListener(new
ItemHandler());
specialCheck2.addItemListener(new
ItemHandler());
specialRadio1.addItemListener(new
ItemHandler());
specialRadio2.addItemListener(new ItemHandler());
specialRadio3.addItemListener(new
ItemHandler());
}
public static void main(String[] args)
{
MenuDemo app = new MenuDemo();
}
public class WindowHandler extends
WindowAdapter
{
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}
public class
MenuItemHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String cmd = e.getActionCommand();
if(cmd.equals("Exit")) System.exit(0);
else label.setText("You Have
Selected: "+cmd);
}
}
public class
ItemHandler implements ItemListener
{
public void itemStateChanged(ItemEvent e)
{
AbstractButton button = (AbstractButton)
e.getItem();
String text = button.getText();
String display="Welcome to American
Education
Systems";
label.setText(display);
if(text.equals("Red") &&
button.isSelected())
label.setForeground(Color.red);
else if(text.equals("Green")
&& button.isSelected())
label.setForeground(Color.green);
else if(text.equals("Blue")
&& button.isSelected())
label.setForeground(Color.blue);
if(text.equals("Italic")
&& button.isSelected())
label.setFont(new
Font("TimesRoman",Font.ITALIC,20));
else if(text.equals("Bold")
&& button.isSelected())
label.setFont(new
Font("TimesRoman",Font.BOLD,20));
else label.setFont(new
Font("TimesRoman",Font.PLAIN,20));
}
}
}
43. Write a program to print
the port, protocol, host, file name from the given URL. (URLDemo.java)
import
java.net.*;
class URLDemo
{
public static
void main(String args[]) throws
MalformedURLException
{
URL hp=new
URL("HTTP://www.sun.com:80/doc/ejb/whitepaper.html");
System.out.println("Protocol:"
+hp.getProtocol());
System.out.println("Port:"
+hp.getPort());
System.out.println("Host:"
+hp.getHost());
System.out.println("File:"
+hp.getFile());
System.out.println("Ext:"
+hp.toExternalForm());
}
}
44. Write a program to create
a bean for introspection. (IntrospectorDemo.java)
Note:Uses Colors.class for
introspection.
// Introspection
import java.beans.*;
import java.awt.*;
public class IntrospectorDemo
{
public static void main(String args[])
{
try
{
System.out.println("Hai");
Class
c = Class.forName("Colors");
System.out.println("class
loaded");
BeanInfo
beaninfo = Introspector.getBeanInfo(c);
BeanDescriptor
beanDescriptor=beaninfo.getBeanDescriptor();
System.out.println("Bean
Name = " +
beanDescriptor.getName());
System.out.println("Hello");
System.out.println("Properties");
PropertyDescriptor
propertyDescriptor[] =
beaninfo.getPropertyDescriptors();
for(int i=0;
i<propertyDescriptor.length; i++)
{
System.out.println("\t"
+
propertyDescriptor[i].getName());
}
System.out.println("Events");
EventSetDescriptor
eventdescriptor[] =
beaninfo.getEventSetDescriptors();
for(int
i=0; i<eventdescriptor.length; i++)
{
System.out.println("\t"
+
eventdescriptor[i].getName());
}
}
catch(Exception e)
{ }
}
}
45.
Write a program to create a Bean to illustrate the boolean
property. (bool.java)
import java.applet.*;
import java.awt.*;
import java.io.*;
public class bool extends Applet
implements Serializable
{
boolean rect=true;
public
boolean isrectangle()
{
return rect;
}
public void setrectangle(boolean a)
{
rect =a;
}
public boolean getrectangle()
{
return rect;
}
public void paint(Graphics g)
{
if(rect)
g.fillRect(10,10,100,50);
else
g.fillOval(10,10,100,50);
}
}
46. Write a program to develop a Bean to show how to restrict an editor
from accepting numeric values. (DisplayBean.java)
import java.awt.*;
import java.awt.event.*;
import java.io.Serializable;
import java.text.*;
import java.beans.*;
public class DisplayBean extends
Container
implements Serializable,KeyListener
{
protected TextField display;
protected boolean editable;
protected boolean canDisplay;
protected String displayType = "Numeric Field";
protected String text;
public DisplayBean()
{
super();
text="";
setLayout(new GridLayout(1,1));
display=new TextField("hello welcome");
editable=true;
canDisplay=false;
add(display);
display.addKeyListener(this);
}
public synchronized void setEditable(boolean b)
{
if(b!=editable)
{
fireModeChange(editable,b);
editable=b;
display.setEditable(editable);
}
}
public boolean getEditable()
{
return editable;
}
public String getDisplayType()
{
return displayType;
}
public synchronized void setDisplayType(String type)
{
if(!(displayType.equals(type)))
{
fireDisplayTypeChange(displayType,type);
displayType=type;
displayData(text);
}
}
public String getDisplayText()
{
return text;
}
public synchronized void setDisplayText(String text)
{
if(!(this.text.equals(text)))
{
fireTextChange(this.text,text);
displayData(text);
}
}
private void displayData(String text)
{
this.text=text;
if(displayType.equals("Numeric
Field"))
{
displayNumeric();
}
else if(displayType.equals("Text
Field"))
{
displayText();
}
}
private void displayNumeric()
{
for(int i=0;i<text.length();i++)
{
if(text.charAt(i)>='0'
&& text.charAt(i) <='9')
{
canDisplay=true;
}
else {
canDisplay=false;
break;
}
}
if(canDisplay)
{
display.setText(text);
}
else {
display.setText("
");
}
canDisplay = false;
}
private void displayText()
{
display.setText(text);
}
public void clear()
{
display.setText("
");
}
public void keyTyped(KeyEvent e)
{
if(displayType.equals("Numeric
Field"))
{
char c;
if(!((c=e.getKeyChar()) >='0'
&& c<='9'))
{
e.consume();
Toolkit.getDefaultToolkit().beep();
}
}
}
public void keyReleased(KeyEvent e) { }
public void keyPressed(KeyEvent e) { }
protected PropertyChangeSupport listeners = new
PropertyChangeSupport(this);
public synchronized void
addPropertyChangeListener(PropertyChangeListener l)
{
listeners.addPropertyChangeListener(l);
}
public synchronized void
removePropertyChangeListener(PropertyChangeListener l)
{
listeners.removePropertyChangeListener(l);
}
public void fireTextChange(String oldText,
String newText)
{
listeners.firePropertyChange("text",oldText,newText);
}
public void fireDisplayTypeChange(String
oldDisplayType,String newDisplayType)
{
listeners.firePropertyChange("displayType",
oldDisplayType,newDisplayType);
}
public void fireModeChange(boolean oldVal,
boolean newVal)
{
listeners.firePropertyChange("editable",
new Boolean(oldVal),new
Boolean(newVal));
}
}
47. Write a programs to create sequence of codes for a client/server
application Using RMI.
Source Files on Server Side:
1.
Addserverint.java
2.
AddServer.java
3.
AddServerImpl.java
Addserverint.java
import java.rmi.*;
public interface Addserverintf
extends Remote
{
double
add (double d1,double d2) throws RemoteException;
}
AddServer.java
import java.net.*;
import java.rmi.*;
public class AddServer
{
public static void main(String args[])
{
try
{
AddServerImpl
addServerImpl = new
AddServerImpl();
Naming.rebind("AddServer",addServerImpl);
}
catch (Exception e)
{
System.out.println("exception:
"+e);
}
}
}
AddServerImpl.java
import java.rmi.*;
import java.rmi.server.*;
public class AddServerImpl extends
UnicastRemoteObject implements Addserverintf
{
public AddServerImpl() throws RemoteException
{ }
public double add(double d1,double d2) throws
RemoteException
{
return d1+d2;
}
}
Instructions
On server side:
Before
compiling enter the following code in the command prompt.
set
the path where Java is installed.
Enter
javac - d *.java in the comand prompt to compile the four source file you have
created.
Now
all the class files has been created in a directory in whichever directory you
have placed.
create
the stub and skeleton codes.
To
do that,
enter rmic AddServerImpl.java in the
command prompt.
Now
in the divide directory you can see the follwing files
Addserverintf.java
Addserverintf.class
AddServer.java
AddServer.class
AddServerImpl.java
AddServerImpl.class
AddServerImpl_skel.class
AddServerImpl_stud.class
copy
all the java files from server machine to this client machine.(espl. Stub and
implementation class file)
Start
the RMI Registry on the Server Machine
using the command: start rmiregistry
The
RMI Registry maps names to object references.
Start
the Server
Start
the server code from the command line as shown here.
java AddServer
48. Write a program to send
in two values to the server program(Q.no.47) and get back the result calculated
using RMI.
Client Side
Program: AddClient.java
import java.lang.*;
import java.rmi.*;
public class AddClient
{
public static void main(String args[])
{
try
{
String addServerURL = "rmi://AES04/AddServer";
Addserverintf addServerintf =
(Addserverintf)Naming.lookup(addServerURL);
System.out.println("the sum
is" +
addServerintf.add(5,6));
}
catch(Exception e)
{
System.out.println("Exception
" + e);
}
}
}
Instructions
on Client Side:
Compile and then Run the
Client(AddClient.class). The client program takes 2 parameters within the
program to the server and the result is calculated by the server and the result
is displayed on the screen.
java AddClient
49. Write a program to
present the GUI with BorderLayout. (border.java)
import java.awt.*;
import java.applet.*;
import javax.swing.*;
import javax.swing.JApplet;
/*
<applet code=border height=400 width=400>
</applet>
*/
public class border extends JApplet
{
// INSTANCE VARIABLES
private JLabel nameLabel
=
new JLabel("Enter Your Name");
private JTextField nameTextField =
new JTextField(24);
private JButton joinButton =
new JButton("Join The Chat
Room");
private JButton leaveButton =
new JButton("Leave");
private JButton sendButton =
new JButton("Send");
private JTextArea inputTextArea = new
JTextArea (10,40);
private JTextArea outputTextArea =
new JTextArea(10,40);
private JScrollPane inputScrollPane =
new JScrollPane(inputTextArea);
private JScrollPane outputScrollPane= new JScrollPane(outputTextArea);
private String enterPrompt =
"Enter Name To Join";
private Container appletContainer
= getContentPane();
public void init()
{
JPanel pl = new JPanel();
pl.setLayout(new GridLayout(1,3));
pl.add(nameLabel);
pl.add(nameTextField);
pl.add(joinButton);
appletContainer.add(pl,BorderLayout.NORTH);
JPanel p2 = new JPanel();
p2.setLayout(new GridLayout(1,2));
p2.add(inputScrollPane);
p2.add(outputScrollPane);
appletContainer.add(p2,
BorderLayout.CENTER);
JPanel p3 = new JPanel ();
p3.setLayout(new GridLayout (1,2));
JPanel p4 = new JPanel();
p4.add(sendButton);
p3.add(p4);
JPanel p5 = new JPanel();
p5.add(leaveButton);
p3.add(p5);
appletContainer.add(p3, BorderLayout.SOUTH);
} // end of client class.
}
50. Write a servlet program
using GenericServlet class to display some message. (WelcServlet.java)
import java.io.*;
import javax.servlet.*;
public class WelcServlet extends
GenericServlet
{
public void service (ServletRequest req, ServletResponse response)
throws ServletException,
IOException
{
response.setContentType("Text/html");
PrintWriter pW = response.getWriter();
pW.println("<B> Welcome to servlets!");
pW.close();
}
}
51. Write a program to
display the ip address of a given host machine. (LookUp.java)
import java.net.*;
public class LookUp
{
public static void main(String args[])
throws
UnknownHostException
{
InetAddress someHost;
byte bytes[];
int fourBytes[] = new int[4];
if(args.length == 0)
{
someHost
= InetAddress.getLocalHost();
}
else
{
someHost =
InetAddress.getByName(args[0]);
}
System.out.println("Host ' " +
someHost.getHostName() + "' has
address: ");
bytes = someHost.getAddress();
for(int i=0; i<4; i++)
{
fourBytes[i] = bytes[i]
& 255;
}
System.out.println(fourBytes[0] +
"." +
fourBytes[1] + "." +
fourBytes[2]
+ "." +
fourBytes[3]);
}
}
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