1. RATIONAL
NUMBER
PROGRAM:
import java.io.*;
class rational
{
private float num;
private float den;
public rational(float x, float y)
{
num=x;
den=y;
}
public String toString()
{
return num+"/"+den;
}
public void rf()
{
if(num<den)
{
for(int i=2;i<=num;i++)
{
while((num%i)==0&&(den%i)==0)
{
num=num/i;
den=den/i;
}
}
}
else
{
for(int i=2;i<=den;i++)
{
while((num%i)==0&&(den%i)==0)
{
num=num/i;
den=den/i;
}
}
}
}
public rational add(rational r)
{
rational
result=new rational(0,0);
result.den=den*r.den;
result.num=r.den*num+r.num*den;
return result;
}
public static void main(String a[])throws IOException
{
BufferedReader
in=new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter
the rational number1 in the form a/b:");
String relstr1=in.readLine();
System.out.print("Enter
the rational number2 in the form a/b:");
String relstr2=in.readLine();
float[] num1=new float[2];
float[] num2=new float[2];
try
{
String[] numstr=new String[2];
numstr=relstr1.split("/");
for(int i=0;i<2;i++)
{
num1[i]=Float.parseFloat(numstr[i]);
}
numstr=new String[2];
numstr=relstr2.split("/");
for(int i=0;i<2;i++)
{
num2[i]=Float.parseFloat(numstr[i]);
}
rational rel1=new
rational(num1[0],num1[1]);
rational rel2=new
rational(num2[0],num2[1]);
rel1.rf();
rel2.rf();
rational
reladd=rel1.add(rel2);
reladd.rf();
System.out.println("Reduced form of Relational
number1:"+rel1.toString());
System.out.println("Reduced form of Relational
number2:"+rel2.toString());
System.out.println("Reduced
form of Addition:"+reladd.toString());
}
catch(Exception e)
{
System.out.println("Wrong
insert");
}
}
}
OUTPUT
E:\Java>javac rational.java
E:\Java>java rational
Enter the rational number1 in the form a/b:123/321
Enter the rational number2 in the form a/b:789/987
Reduced form of Relational number1:41.0/107.0
Reduced form of Relational number2:263.0/329.0
Reduced form of Addition:41630.0/35203.0
E:\Java>
2. DATE CLASS
PROGRAM:
import java.util.*;
class Date1
{
private
int date=0;
private
int month=0;
private
int year=0;
public
int getyear()
{
return year;
}
public
int getmonth()
{
return month;
}
public
int getdate()
{
return date;
}
public
Date1()
{
Calendar c=Calendar.getInstance();
date=c.get(Calendar.DAY_OF_MONTH);
month=c.get(Calendar.MONTH);
year=c.get(Calendar.YEAR);
}
public
Date1(int d,int m,int y)
{
date=d;
month=m;
year=y;
}
public
String toString()
{
String ret="
"+date+"/"+month+"/"+year;
return ret;
}
public
static void main(String args[])
{
Date1 d=new Date1();
System.out.println("Today’s Date is
"+d);
}
}
OUTPUT:
E:\Java>javac Date1.java
E:\Java>java Date1
Today’s Date is 27/5/2002
E:\Java>
3. LISP LIKE
LIST
PROGRAM
import java.io.*;
import java.util.*;
class lisp1
{
private Vector <Integer> elements;
public lisp1()
{
elements=new
Vector<Integer>();
}
public void push(int elem)
{
elements.add(elem);
}
public int car()
{
try
{
int a=elements.firstElement();
return a;
}
catch(NoSuchElementException
e)
{
System.out.println("Lisp
is empty");
return 0;
}
catch(Exception e)
{
System.out.println(e);
return 0;
}
}
public int[] cdr()
{
int r[]=new
int[elements.size()];
ListIterator iter =
elements.listIterator(0);
int i=0;
while (iter.hasNext())
r[i++] = (Integer)iter.next();
return r;
}
public int[] cons()
{
int r[]=new
int[elements.size()];
ListIterator iter =
elements.listIterator(r.length);
int i=0;
while (iter.hasPrevious())
r[i++]=(Integer)iter.previous();
return r;
}
public static void main(String args[])
{
int j;
lisp1 l=new lisp1();
int count,value;
Scanner in=new
Scanner(System.in);
System.out.println("Enter
the no.of elements");
count=in.nextInt();
for(j=0;j<count;j++)
{
System.out.println("Enter
the "+j+" element");
value=in.nextInt();
l.push(value);
}
System.out.println("Car=>
" + l.car());
System.out.println("Cdr=>
");
int nums[]=l.cdr();
for(int
i=1;i<nums.length;i++)
System.out.println(""+i+"
-> "+ nums[i]);
System.out.println("Cons=>
");
int all[]=l.cons();
for(int
i=0;i<all.length;i++)
System.out.println(""+i+"
-> "+ all[i]);
}
}
OUTPUT
E:\Java>javac lisp1.java
E:\Java>java lisp1
Enter the no.of elements
5
Enter the 0 element
1
Enter the 1 element
2
Enter the 2 element
3
Enter the 3 element
4
Enter the 4 element
5
Car=> 1
Cdr=>
1 -> 2
2 -> 3
3 -> 4
4 -> 5
Cons=>
0 -> 5
1 -> 4
2 -> 3
3 -> 2
4 -> 1
E:\Java>
4. ADT STACK
PROGRAM
import java.util.*;
interface Stack_interface
{
public void push(int val)throws Exception;
public int pop()throws Exception;
public boolean isEmpty();
public String toString();
}
class Stack_array implements Stack_interface
{
private int[]array;
private int top=-1;
private int array_max=-1;
public void push(int val)throws Exception
{
if(top==array_max)
{
throw new
Exception("Stack overflow");
}
top++;
array[top]=val;
}
public int pop() throws Exception
{
if(top==-1)
{
throw new
Exception("Stack underflow");
}
int
ret=array[top];
top--;
return ret;
}
public boolean isEmpty()
{
if(top==-1)
return true;
else
return false;
}
public String toString()
{
String
message="STACK=> ";
for(int
i=0;i<=top;i++)
message+=array[i]+"
";
return message;
}
public Stack_array(int max)
{
array_max=max;
array=new
int[array_max];
}
}
class Stack_list implements Stack_interface
{
private LinkedList<Integer>list;
public void push(int val)throws Exception
{
try
{
list.addFirst(val);
}
catch(Exception
e)
{
throw e;
}
}
public int pop()throws Exception
{
try
{
return(int)list.removeFirst();
}
catch(Exception
e)
{
throw e;
}
}
public boolean isEmpty()
{
return
list.isEmpty();
}
public Stack_list()
{
list=new
LinkedList<Integer>();
}
public String toString()
{
String
message="STACK=> ";
for(int
i=0;i<list.size();i++)
message+=list.get(i)+"
";
return message;
}
}
public class StackADT
{
public static void main(String args[])
{
try
{
int x,y,ch;
String ans;
Scanner in=new
Scanner(System.in);
Stack_array b=new
Stack_array(10);
Stack_list a=new
Stack_list();
while(true)
{
try
{
System.out.println("1.PUSH
BY LINKED LIST"+"\n"+"2.POP BY LINKED LIST");
System.out.println("3.PUSH BY
ARRAY"+"\n"+"4.POP BY ARRAY"+"\n"+"5.EXIT"+"\n");
System.out.println("Enter
ur choice");
ch=in.nextInt();
switch(ch)
{
case 1:
System.out.println("
Enter the elements to be pushed by linked list");
x=in.nextInt();
a.push(x);
System.out.println("pushed
item by linked list is "+a);
break;
case 2:
System.out.println("popped
item by linked list is"+a.pop());
break;
case 3:
System.out.println("Enter
the elements to be pushed using array");
y=in.nextInt();
b.push(y);
System.out.println("pushed
item by using array is"+b);
break;
case 4:
System.out.println("poped
item by array is"+b.pop());
break;
case 5:
System.exit(0);
break;
default:
System.out.println("Enter
the correct choice");
}
}
catch(Exception
e)
{
System.err.println("try
again("+e+")");
}
}
}
catch(Exception
e)
{
System.err.println(e);
}
}
}
OUTPUT
E:\Java>javac StackADT.java
E:\Java>java StackADT
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
1
Enter the elements to be pushed
by linked list
1
pushed item by linked list is STACK=> 1
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
1
Enter the elements to be pushed
by linked list
2
pushed item by linked list is STACK=> 2 1
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
1
Enter the elements to be pushed
by linked list
3
pushed item by linked list is STACK=> 3 2 1
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
2
popped item by linked list is3
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
2
popped item by linked list is2
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
2
popped item by linked list is1
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
2
try again(java.util.NoSuchElementException)
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
3
Enter the elements to be pushed using array
1
pushed item by using array isSTACK=> 1
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
3
Enter the elements to be pushed using array
2
pushed item by using array isSTACK=> 1 2
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
3
Enter the elements to be pushed using array
3
pushed item by using array isSTACK=> 1 2 3
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
4
poped item by array is3
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
4
poped item by array is2
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
4
poped item by array is1
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
4
try again(java.lang.Exception: Stack underflow)
1.PUSH BY LINKED LIST
2.POP BY LINKED LIST
3.PUSH BY ARRAY
4.POP BY ARRAY
5.EXIT
Enter ur choice
5
E:\Java>
5. VECHICLE
CLASS HIERARCHY
PROGRAM
import java.io.*;
import java.util.*;
abstract class vehicle
{
String name;
double weight;
int wheels;
abstract void
display();
}
class car extends vehicle
{
public int passenger;
public car(String
name,int wheels,int passenger,double weight)
{
this.name=name;
this.weight=weight;
this.passenger=passenger;
this.wheels=wheels;
}
public void display()
{
System.out.println("Name:"+name);
System.out.println("Weight:"+weight);
System.out.println("Passenger:"+passenger);
System.out.println("Wheels:"+wheels);
}
}
class truck extends vehicle
{
public double payload;
public truck(String
name,int wheels,double payload,double weight)
{
this.name=name;
this.weight=weight;
this.payload=payload;
this.wheels=wheels;
}
public void display()
{
System.out.println("Name:"+name);
System.out.println("Weight:"+weight);
System.out.println("Payload:"+payload);
System.out.println("Wheels:"+wheels);
}
}
class test
{
public static void
main(String args[])throws IOException
{
System.out.println("Car details");
BufferedReader in=new BufferedReader(new
InputStreamReader(System.in));
String s1=in.readLine();
String s2=in.readLine();
int x=Integer.parseInt(s2);
String s3=in.readLine();
int y=Integer.parseInt(s3);
String s4=in.readLine();
double z=Double.parseDouble(s3);
car cr1=new car(s1,x,y,z);
cr1.display();
System.out.println("Truck details");
BufferedReader is=new BufferedReader(new
InputStreamReader(System.in));
String s5=is.readLine();
String s6=is.readLine();
int e=Integer.parseInt(s2);
String s7=is.readLine();
double r=Double.parseDouble(s3);
String s8=is.readLine();
double t=Double.parseDouble(s3);
truck trk=new truck(s5,e,r,t);
trk.display();
}
}
OUTPUT
E:\Java>javac
test.java
E:\Java>java
test
Car details -
Name, Wheels, Passenger, Weight
Ford
4
4
500
Name:Ford
Weight:500.0
Passenger:4
Wheels:4
Truck details -
Name, Wheels, Payload, Weight
Bolero
4
4
500
Name:Bolero
Weight:500.0
Payload:4.0
Wheels:4
E:\Java>
6. OBJECT SERIALIZATION
PROGRAM
abstract class
Currency implements java.io.Serializable
{
protected final double rupeesperDollar=45;
protected double value;
public Currency(double val)
{
value=val;
}
abstract public String toString();
abstract public double convert();
}
class Dollar
extends Currency
{
public Dollar(double val)
{
super(val);
}
public String toString()
{
return "$"+value;
}
public double convert()
{
return value*rupeesperDollar;
}
}
class Rupee extends
Currency
{
public Rupee(double val)
{
super(val);
}
public String toString()
{
return "Rs"+value;
}
public double convert()
{
return value/rupeesperDollar;
}
}
import
java.util.Random;
import java.io.*;
public class
WriteCurrency
{
public static void main(String args[])
{
try
{
int numberOfElements=10;
ObjectOutputStream out=new ObjectOutputStream(new
FileOutputStream("Currency"));
Random randomGenerator=new
Random();
out.writeInt(numberOfElements);
for(int
i=0;i<numberOfElements;i++)
{
if(randomGenerator.nextBoolean())
{
Rupee r = new
Rupee(randomGenerator.nextInt(100));
out.writeObject(r);
System.out.println("("+i+")"+r);
}
else
{
Dollar d=new Dollar(i);
out.writeObject(d);
System.out.println("("+i+")"+d);
}
}
out.close();
}
catch(Exception e)
{
System.out.println(e);
}
}
}
import java.io.*;
public class ReadCurrency
{
public static void main(String args[])throws Exception
{
try
{
ObjectInputStream in=new ObjectInputStream(new
FileInputStream("Currency"));
int numberOfElements=in.readInt();
for(int
i=0;i<numberOfElements;i++)
{
Object o=in.readObject();
System.out.print("("+i+")");
if(o instanceof Dollar) //can
also use Dollar.class.is.Instance(d)
System.out.println("Rs"+((Dollar)o).convert()+"(converted
from Dollar)");
else
System.out.println((Rupee)o);
}
in.close();
}
catch(FileNotFoundException e)
{
System.out.println("Please
run write Currency first");
}
catch(Exception e)
{
System.out.println(e);
}
}
}
OUTPUT
E:\Java>javac Currency.java
E:\Java>javac WriteCurrency.java
E:\Java>javac ReadCurrency.java
E:\Java>java WriteCurrency
(0)Rs30.0
(1)Rs54.0
(2)Rs17.0
(3)$3.0
(4)Rs50.0
(5)Rs10.0
(6)$6.0
(7)Rs74.0
(8)Rs23.0
(9)Rs73.0
E:\Java>java ReadCurrency
(0)Rs30.0
(1)Rs54.0
(2)Rs17.0
(3)Rs135.0(converted from Dollar)
(4)Rs50.0
(5)Rs10.0
(6)Rs270.0(converted from Dollar)
(7)Rs74.0
(8)Rs23.0
(9)Rs73.0
E:\Java>
7. SCIENTIFIC CALCULATOR
PROGRAM
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class calculatorapplet extends
Applet implements ActionListener
{
private
Button keysArray[];
private
Panel keyPad;
private
TextField lcdField;
private
double result;
private
boolean first;
private
boolean foundKey;
static
boolean clearText;
private
int prevOperator;
public
void init()
{
lcdField=new
TextField(20);
keyPad=new
Panel();
keysArray=new
Button[17];
result=0.0;
prevOperator=0;
first=true;
lcdField.setEditable(false);
for(int
i=0;i<=9;i++)
keysArray[i]=new Button(String.valueOf(i));
keysArray[10]=new
Button("/");
keysArray[11]=new
Button("*");
keysArray[12]=new
Button("-");
keysArray[13]=new
Button("+");
keysArray[14]=new
Button("=");
keysArray[15]=new
Button(".");
keysArray[16]=new
Button("CLR");
keyPad.setLayout(new
GridLayout(4,4));
for(int
i=7;i<=10;i++)
keyPad.add(keysArray[i]);
for(int i=4;i<=6;i++)
keyPad.add(keysArray[i]);
keyPad.add(keysArray[11]);
for(int
i=1;i<=3;i++)
keyPad.add(keysArray[i]);
keyPad.add(keysArray[12]);
keyPad.add(keysArray[0]);
for(int
i=15;i>=13;i--)
keyPad.add(keysArray[i]);
add(lcdField,BorderLayout.NORTH);
add(keyPad,BorderLayout.CENTER);
add(keysArray[16],BorderLayout.EAST);
for(int
i=0;i<keysArray.length;i++)
keysArray[i].addActionListener(this);
}
public void
actionPerformed(ActionEvent e)
{
foundKey=false;
for(int
i=0;i<keysArray.length&&!foundKey;i++)
if(e.getSource()==keysArray[i])
{
foundKey=true;
switch(i)
{
case 0:
case
1:
case
2:
case
3:
case
4:
case 5:
case 6:
case 7:
case
8:
case
9:
case 15:
if(clearText)
{
lcdField.setText("");
clearText=false;
}
lcdField.setText(lcdField.getText()+
keysArray[i].getLabel());
break;
case 10:
case 11:
case 12:
case 13:
case 14:
clearText=true;
if(first)
{
if(lcdField.getText().length()==0)
result=0.0;
else
result=Double.valueOf(lcdField.getText()).doubleValue();
first=false;
prevOperator=i;
}
else
{
switch(prevOperator)
{
case 10:
result/=Double.valueOf(lcdField.getText()).doubleValue();
break;
case 11:
result*=Double.valueOf(lcdField.getText()).doubleValue();
break;
case 12:
result-=
Double.valueOf (lcdField.getText()).doubleValue();
break;
case 13:
result+=Double.valueOf
(lcdField.getText()).doubleValue();
break;
}
lcdField.setText(Double.toString(result));
if(i==14)
first=true;
else
prevOperator=i;
}
break;
case 16:
clearText=true;
first=true;
lcdField.setText("");
result=0.0;
prevOperator=0;
break;
}
}
}
}
//<applet
code="calculatorapplet.class" width=300 height=200></applet>
OUTPUT
E:\Java>javac calculatorapplet.java
E:\Java>appletviewer calculatorapplet.java
E:\Java>
8. MULTI THREADING USING PIPES
PROGRAM
import java.io.*;
class global
{
public static int max=0;
public static final int size_of_int=4;
public static int getInt(PipedInputStream pi)
{
byte[] b=new byte[4];
try
{
if(4!=pi.read(b,0,size_of_int))
return -1;
}
catch(IOException e)
{
return -1;
}
catch(Exception e)
{
e.printStackTrace();
System.exit(0);
return -1;
}
int v=0;
v=(b[0]<<24)+((b[1]&0xFF)<<16)+((b[2]&0xFF)<<8)+((b[3]&0xFF));
return v;
}
public static byte[] getBytes(int v)
{
byte b[]=new
byte[]{(byte)(v>>>24),(byte)(v>>>16),(byte)(v>>>8),(byte)(v)};
return b;
}
}
class Fibbinocci
extends global implements Runnable
{
PipedOutputStream po;
public Fibbinocci(PipedInputStream pi)
{
try
{
po=new PipedOutputStream(pi);
}
catch(Exception e)
{
e.printStackTrace();
}
}
public void run()
{
int prev=0;
int curr=1;
try
{
for(prev=0;prev<max;)
{
po.write(getBytes(prev));
int temp=curr;
curr=curr+prev;
prev=temp;
}
po.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
class Prime extends
global implements Runnable
{
PipedOutputStream po;
public Prime(PipedInputStream pi)
{
try
{
po=new PipedOutputStream(pi);
}
catch(Exception e)
{
e.printStackTrace();
System.exit(0);
}
}
public void run()
{
try
{
for(int p=2;p<max;p++)
{
int i;
boolean isprime=true;
int sqr=(int)Math.sqrt(p);
for(i=2;i<=sqr;i++)
if(p%i==0)
{
isprime=false;
break;
}
if(isprime)
{
po.write(getBytes(p));
}
}
po.close();
}
catch(InterruptedIOException
ie)
{
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
public class Pipe
extends global
{
public static void main(String[] args)
{
try
{
max=100000;
PipedInputStream fibb_pipe=new
PipedInputStream();
PipedInputStream prim_pipe=new
PipedInputStream();
Fibbinocci fibb=new Fibbinocci(fibb_pipe);
Prime prim=new
Prime(prim_pipe);
Thread t1=new Thread(fibb);
Thread t2=new Thread(prim);
t1.start();
t2.start();
for(int
common=0,f=getInt(fibb_pipe),p=getInt(prim_pipe);;)
{
if(f==p)
{
common=f;
System.out.println(common);
f=getInt(fibb_pipe);
p=getInt(prim_pipe);
}
else if(f<p)
{
f=getInt(fibb_pipe);
}
else
{
p=getInt(prim_pipe);
}
if(f==-1||p==-1)
{
break;
}
}
System.out.println("Done");
t1.interrupt();
t1.join();
t2.interrupt();
t2.join();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
OUTPUT
E:\Java>javac Pipe.java
E:\Java>java Pipe
2
3
5
13
89
233
1597
28657
Done
E:\Java>
9.JAVA DATABASE
CONNECTIVITY
PROGRAM:
import java.io.*;
import java.awt.*;
import
java.awt.event.*;
import java.sql.*;
import
javax.swing.*;
import java.net.*;
public class
college extends Frame implements ActionListener
{
Label l1,l2,l3,l4,l5;
TextField t1,t2,t3,t4,t5;
Button b1,b2;
Connection con;
ResultSet rs;
Statement st;
public college()
{
setLayout(null);
l1=new Label("Emp
Name");
l2=new Label("Emp
ID");
l3=new Label("Emp
Department");
l4=new Label("Emp
Desg");
l5=new Label("Emp
Salary");
t1=new TextField(20);
t2=new TextField(20);
t3=new TextField(20);
t4=new TextField(20);
t5=new TextField(20);
b1=new
Button("Save");
b2=new
Button("cancel");
l1.setBounds(40,40,100,25);
t1.setBounds(140,40,100,25);
l2.setBounds(40,80,100,25);
t2.setBounds(140,80,100,25);
l3.setBounds(40,120,100,25);
t3.setBounds(140,120,100,25);
l4.setBounds(40,160,100,25);
t4.setBounds(140,160,100,25);
l5.setBounds(40,200,100,25);
t5.setBounds(140,200,100,25);
b1.setBounds(40,240,100,25);
b2.setBounds(140,240,100,25);
add(l1);
add(t1);
add(l2);
add(t2);
add(l3);
add(t3);
add(l4);
add(t4);
add(l5);
add(t5);
add(b1);
add(b2);
b1.addActionListener(this);
b2.addActionListener(this);
}
public static void main(String
args[])throws Exception
{
college n=new college();
n.setSize(500,350);
n.show();
}
public void
actionPerformed(ActionEvent ae)
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con=DriverManager.getConnection("jdbc:odbc:vvk","scott","tiger");
st=con.createStatement();
if(ae.getSource()==b1)
{
//System.out.println("ok");
st.executeUpdate("insert
into jay2
values('"+(t1.getText())+"','"+(t2.getText())+"','"+(t3.getText())+"','"+(t4.getText())+"','"+(t5.getText())+"')");
JOptionPane.showMessageDialog(null,"This
record has been inserted","RV'S Project",1);
t1.setText("");
t2.setText("");
t3.setText("");
t4.setText("");
t5.setText("");
}
else
if(ae.getSource()==b2)
{
//System.out.println("nothing
happened");
System.exit(0);
}
}
catch(Exception l)
{}
}
}
10. MULTITHREADED
ECHO SERVER
PROGRAMSERVER
import java.io.*;
import java.net.*;
class eserver
{
public static void main(String[] args)
{
System.out.println("Echo
server started");
try
{
ServerSocket
s=new ServerSocket(8010);
Socket
incoming=s.accept();
System.out.println("Connected to"+
incoming.getInetAddress()+"at port"+incoming.getLocalPort());
BufferedReader in = new BufferedReader(new
InputStreamReader(incoming.getInputStream()));
PrintWriter out=new PrintWriter(new
OutputStreamWriter(incoming.getOutputStream()));
out.println("Hello
This is java EchoServer Enter BYE to exit");
out.flush();
for(;;)
{
String
str=in.readLine();
if(str==null)
{
break;
}
else
{
out.println("Echo
"+str);
out.flush();
System.out.println("Received
"+str);
if(str.trim().equals("bye"))
break;
}
}
incoming.close();
}
catch(Exception
e)
{
System.out.println("Error"+e);
}
System.out.println("EchoServer
Stopped");
}
}
PROGRAM-client
import java.io.*;
import java.net.*;
class eclient
{
public static void main(String[] args)
{
try
{
String host;
if(args.length>0
&& args[0]!= null)
{
host=args[0];
}
else
{
host="localhost";
}
Socket t =new
Socket(host,8010);
BufferedReader in=new BufferedReader(new
InputStreamReader(t.getInputStream()));
PrintWriter out=new PrintWriter(new
OutputStreamWriter(t.getOutputStream()));
for(int
i=1;i<=10;i++)
{
System.out.println("Sending
Line"+i);
out.println("line"+i);
out.flush();
}
out.println("bye");
out.flush();
for(;;)
{
String
str=in.readLine();
if(str==null)
{
break;
}
else
{
System.out.println(str);
}
}
}
catch(Exception
e)
{
System.out.println("Error"+e);
}
}
}
OUTPUT
E:\Java>javac eserver.java
E:\Java>javac eclient.java
E:\Java>java eserver
Echo server started
Connected to/127.0.0.1at port8010
Received line1
Received line2
Received line3
Received line4
Received line5
Received line6
Received line7
Received line8
Received line9
Received line10
Received bye
EchoServer Stopped
E:\Java>
E:\Java>java eclient
Sending Line1
Sending Line2
Sending Line3
Sending Line4
Sending Line5
Sending Line6
Sending Line7
Sending Line8
Sending Line9
Sending Line10
Hello This is java EchoServer Enter BYE to exit
Echo line1
Echo line2
Echo line3
Echo line4
Echo line5
Echo line6
Echo line7
Echo line8
Echo line9
Echo line10
Echo bye
E:\Java>
PROGRAM
import java.awt.*;
import
java.awt.event.*;
import
java.awt.datatransfer.*;
import java.io.*;
public class Editor
extends Frame
{
String filename;
TextArea tx;
Clipboard clip = getToolkit().getSystemClipboard();
Editor()
{
setLayout(new GridLayout(1,1));
tx = new TextArea();
add(tx);
MenuBar mb = new MenuBar();
Menu F = new Menu("File");
MenuItem n = new MenuItem("New");
MenuItem o = new MenuItem("Open");
MenuItem s = new MenuItem("Save");
MenuItem e = new MenuItem("Exit");
n.addActionListener(new New());
F.add(n);
o.addActionListener(new Open());
F.add(o);
s.addActionListener(new Save());
F.add(s);
e.addActionListener(new Exit());
F.add(e);
mb.add(F);
Menu E = new Menu("Edit");
MenuItem cut = new MenuItem("Cut");
MenuItem copy = new MenuItem("Copy");
MenuItem paste = new MenuItem("Paste");
cut.addActionListener(new Cut());
E.add(cut);
copy.addActionListener(new Copy());
E.add(copy);
paste.addActionListener(new Paste());
E.add(paste);
mb.add(E);
setMenuBar(mb);
mylistener mylist = new mylistener();
addWindowListener(mylist);
}
class mylistener extends WindowAdapter
{
public void windowClosing
(WindowEvent e)
{
System.exit(0);
}
}
class New implements ActionListener
{
public void
actionPerformed(ActionEvent e)
{
tx.setText(" ");
setTitle(filename);
}
}
class Open implements ActionListener
{
public void
actionPerformed(ActionEvent e)
{
FileDialog fd = new FileDialog(Editor.this,
"select File",FileDialog.LOAD);
fd.show();
if (fd.getFile()!=null)
{
filename = fd.getDirectory() +
fd.getFile();
setTitle(filename);
ReadFile();
}
tx.requestFocus();
}
}
class Save implements ActionListener
{
public void
actionPerformed(ActionEvent e)
{
FileDialog fd = new FileDialog(Editor.this,"Save
File",FileDialog.SAVE);
fd.show();
if (fd.getFile()!=null)
{
filename = fd.getDirectory() +
fd.getFile();
setTitle(filename);
try
{
DataOutputStream d = new DataOutputStream(new
FileOutputStream(filename));
String line = tx.getText();
BufferedReader br = new BufferedReader(new
StringReader(line));
while((line =
br.readLine())!=null)
{
d.writeBytes(line +
"\r\n");
d.close();
}
}
catch(Exception ex)
{
System.out.println("File
not found");
}
tx.requestFocus();
}
}
}
class Exit implements ActionListener
{
public void
actionPerformed(ActionEvent e)
{
System.exit(0);
}
}
void ReadFile()
{
BufferedReader d;
StringBuffer sb = new
StringBuffer();
try
{
d = new BufferedReader(new
FileReader(filename));
String line;
while((line=d.readLine())!=null)
sb.append(line +
"\n");
tx.setText(sb.toString());
d.close();
}
catch(FileNotFoundException
fe)
{
System.out.println("File
not Found");
}
catch(IOException ioe){}
}
class Cut implements ActionListener
{
public void
actionPerformed(ActionEvent e)
{
String sel =
tx.getSelectedText();
StringSelection ss = new
StringSelection(sel);
clip.setContents(ss,ss);
tx.replaceRange("
",tx.getSelectionStart(),tx.getSelectionEnd());
}
}
class Copy implements ActionListener
{
public void
actionPerformed(ActionEvent e)
{
String sel =
tx.getSelectedText();
StringSelection clipString = new StringSelection(sel);
clip.setContents(clipString,clipString);
}
}
class Paste implements ActionListener
{
public void
actionPerformed(ActionEvent e)
{
Transferable cliptran =
clip.getContents(Editor.this);
try
{
String sel = (String)
cliptran.getTransferData(DataFlavor.stringFlavor);
tx.replaceRange(sel,tx.getSelectionStart(),tx.getSelectionEnd());
}
catch(Exception exc)
{
System.out.println("not
string flavour");
}
}
}
public static void main(String args[])
{
Frame f = new Editor();
f.setSize(500,400);
f.setVisible(true);
f.show();
}
}
OUTPUT
E:\Java>javac
Editor.java
E:\Java>java
Editor
E:\Java>
