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This file is for reference purpose only.

Java

Practical

File

http://www.educationjockey.com/



******************************************************************************

PROGRAM TO PRINT A STRING ******************************************************************************

class a

{

public static void main(String args[])

{

System.out.println("rashi");

}

}




OUTPUT:




************************************************************************

PROGRAM TO CALCULATE LENGTH OF AN ARRAY

************************************************************************

class comdline

{


{

int c=args.length;

System.out.println(c);

}

}




OUTPUT:




************************************************************************

PROGRAM TO ADD TWO STRINGS

************************************************************************

class comd

{


{

String sum;

sum=args[0]+args[1];

System.out.println(sum);

}

}




OUTPUT:




************************************************************************

PROGRAM TO ADD TWO NUMBERS

************************************************************************

class add

{


{

int a,b,c;

a=5;

b=4;

c=a+b;


}

}




OUTPUT:




************************************************************************

PROGRAM TO CHECK WHETHER A NUMBER IS EVEN OR ODD

************************************************************************

class even

{


{

int a;

a=Integer.parseInt(args[0]);

if(a%2==0)

{

System.out.println(a + "is even number");

}

else

{

System.out.println(a + "is odd number");

}

}

}




OUTPUT:




************************************************************************

PROGRAM TO CALCULATE FACTORIAL OF A NUMBER

************************************************************************

class fact

{


{

int n,i,f;

f=1;

n=Integer.parseInt(args[0]);

for(i=n;i>=1;i--)

{

f=f*i;

}

System.out.println("THE FACTORIAL OF " + n + "is: " + f);

}

}




OUTPUT:




************************************************************************

PROGRAM TO CALCULATE FIBONACCI SERIES

************************************************************************

class fibo

{


{

int a=0,b=1,c,n,i;


System.out.println("THE SERIES IS:");

System.out.println(a);

System.out.println(b);

for(i=0;i<n-2;i++)

{

c=a+b;

a=b;

b=c;


}

}

}




OUTPUT:




************************************************************************

PROGRAM TO CALCULATE REVERSE OF A NUMBER

class reverse

{


{

int n,b=0;


while(n>0)

{

int r=n%10;

n=n/10;

b=b*10+r;

}

System.out.println("THE REVERSE IS:");

System.out.println(b);

}

}




OUTPUT:




************************************************************************

PROGRAM TO CALCULATE MATHS FUNCTIONS

************************************************************************

import java.lang.Math;

class func

{


{

double x=25.4;

double y,c,d,a,b;

y=Math.sqrt(x);

System.out.println("THE SQUARE ROOT IS: " + y);

a=Math.ceil(x);

System.out.println("THE CEILED ANSWER IS: " + a);

b=Math.floor(x);

System.out.println("THE FLOORED ANSWER IS : " + b);

c=Math.min(4.3,4.5);

System.out.println("MINIMUM NUMBER IS: " + c);

d=Math.max(4.3,4.5);

System.out.println("MAXIMUM NUMBER IS; " + d);

}




}

OUTPUT:




************************************************************************

PROGRAM TO CONVERT VALUE GIVEN AT COMMAND LINE TO INTEGER &

ADD THEM

************************************************************************

class add1

{


{

int sum;

int d,e;

d=Integer.parseInt(args[0]);

e=Integer.parseInt(args[1]);

sum=d+e;

System.out.println(sum);

}

}




OUTPUT:







************************************************************************

PROGRAM TO DISPLAY VALUES AT COMMANDLINE

************************************************************************

class disp

{


{

int i;

for(i=0;i<args.length;i++)

{

System.out.println(args[i]);

}

}

}




OUTPUT:




************************************************************************

PROGRAM TO CHECK WHETHER CHARACTER IS VOWEL OR CONSONANT

************************************************************************

class vowel

{


{

char b='u';

if(b=='a'||b=='e'||b=='i'||b=='o'||b=='u'||b=='A'||b=='E'||b=='I'||b=='O'||b=='U')

{

System.out.println(b + " is vowel");

}

else

{

System.out.println(b + " is consonant");

}

}

}




OUTPUT:




************************************************************************

PROGRAM TO CHECK WHETHER NUMBER IS PRIME OR NOT

************************************************************************

class prime

{


{

int n=Integer.parseInt(args[0]);

int c=0;

for(int i=1;i<=n;i++)

{

if(n%i==0)

{

c++;

}

}

if(c==2)

{

System.out.println(n + " IS PRIME NUMBER");

}

else

{

System.out.println(n + " IS NOT PRIME NUMBER");

}

}

}




OUTPUT:




************************************************************************

PROGRAM TO FIND THE GREATEST AMONG THE THREE NUMBERS

************************************************************************

class great

{


{

int a=Integer.parseInt(args[0]);

int b=Integer.parseInt(args[1]);

int c=Integer.parseInt(args[2]);

if((a>b) && (a>c))

{

System.out.println(a + " IS GREATEST");

}

else if((b>a) && (b>c))

{

System.out.println(b + " IS GREATEST");

}

else

{

System.out.println(c + " IS GREATEST");

}

}

}




OUTPUT:




************************************************************************

PROGRAM TO USE THE ASSIGNMENT OPERATOR

************************************************************************

class assign

{


{

int a;

a=Integer.parseInt(args[0]);

a+=5;

System.out.println("CHANGED VALUE OF A IS: " + a);

}

}




OUTPUT:




************************************************************************

PROGRAM TO USE THE RELATIONAL OPERATOR

************************************************************************

class relation

{


{


if(a==1)

{

System.out.println("HELLO,YOU HAVE ENTERED 1");

}

else

{

System.out.println("ENTER 1 TO GET OUTPUT");

}

}

}




OUTPUT:




************************************************************************

PROGRAM TO USE THE CONDITIONAL OPERATOR

************************************************************************

class cond

{


{


int x=(a>10)?a:10;

System.out.println("THE VALUE OF X IS : " + x);

}

}




OUTPUT:




************************************************************************

PROGRAM TO USE THE INCREMENT/DECREMENT OPERATOR

************************************************************************

class oper

{


{


int x=a++;

System.out.println("OUTPUT USING POST INCREMENT IS " + x);

int y=++a;

System.out.println("OUTPUT USING PRE INCREMENT IS " + y);

int x1=a--;

System.out.println("OUTPUT USING POST DECREMENT IS " + x1);

int y1=--a;

System.out.println("OUTPUT USING PRE DECREMENT IS " + y1);

}

}




OUTPUT:




************************************************************************

PROGRAM TO USE THE BITWISE OPERATOR

************************************************************************

class bit

{


{


int x=a<<2;

System.out.println("OUTPUT USING LEFT SHIFT IS : " + x);

int y=a>>2;

System.out.println("OUTPUT USING RIGHT SHIFT IS : " + y);

}

}




OUTPUT:




************************************************************************

PROGRAM TO USE WHILE,DO=WHILE,FOR LOOP

************************************************************************

class loop

{


{

System.out.println("RESULT OF FOR LOOP IS : ");

for(int i=1;i<5;i++)

{

System.out.println(i);

}

System.out.println("RESULT OF WHILE LOOP IS : ");

int n=1;

while(n<5)

{

System.out.println(n);

n=n+1;




}

System.out.println("RESULT OD DO-WHILE LOOP IS : ");

int j=1;

do

{

System.out.println(j);

j=j+1;

}

while(j<5);

}

}

OUTPUT:







************************************************************************

PROGRAM TO USE POST AND PRE INCREMENT OPERATOR

************************************************************************

class hi

{


int x=1;

int y=1;

x=x++ + y++;

System.out.println("VALUE OF X IS : " + x);

System.out.println("VALUE OF Y IS : " + y);

y=++x + ++y;

System.out.println("VALUE IS : " + x);

System.out.println("VALUE IS : " + y);

}

}




OUTPUT:




************************************************************************

PROGRAM TO USE MATH FUNCTION AND CALCULATE VOLUME

************************************************************************

import java.lang.Math;

class func1

{


{

int r=Integer.parseInt(args[0]);

double x=Math.pow(r,3);

double y=Math.PI;

double v=(4*y*x)/3;

System.out.println("VOLUME IS : " + v);

}

}




OUTPUT:




************************************************************************

PROGRAM TO MANIPULATE STRINGS

************************************************************************

class sfunc

{


{

String s1=new String();

String s2=new String();

s1=args[0];

s2=args[1];

System.out.println("RESULT AFTER CONCATENATION " + (s1.concat(s2)));

System.out.println("LENGTH OF SECOND STRING IS : " + (s2.length()));

System.out.println("RESULT AFTER CHECKING EQUALITY " + (s1.equals(s2)));

System.out.println("RESULT AFTER CHECKING EQUALITY AND IGNORING

CASE : " + (s1.equalsIgnoreCase(s2)));

}

}




OUTPUT:




************************************************************************

PROGRAM FOR PRINTING SERIES

************************************************************************

class series

{


{

int n=Integer.parseInt(args[0]);

System.out.print("1\n");

for(int j=1;j<=n;j++)

{

System.out.print("1");

int a=0;

int b=1;

for(int i=1;i<=j;i++)

{

int c=a+b;

a=b;

b=c;

System.out.print(c);

}

System.out.print("\n");

}

}

}




OUTPUT:




************************************************************************

PROGRAM TO IMPLEMENT INPUT FROM THE USER

************************************************************************

import java.io.*;

class input

{

public static void main(String args[])throws IOException

{

BufferedReader a=new BufferedReader (new InputStreamReader(System.in));

String n;

System.out.println("ENTER STRING");

System.out.flush();

n=a.readLine();

System.out.println("YOU HAVE ENTERED " + n);

}

}




OUTPUT:




************************************************************************

PROGRAM TO USE THIS KEYWORD

class a

{

int age;

String name;

a(String name,int age)

{

this.name=name;

this.age=age;

}

void display()

{

System.out.println("NAME IS " + name);

System.out.println("AGE IS " + age);

}

}

class thii

{


{

a o=new a("rashi",20);

o.display();

}

}




OUTPUT:




************************************************************************

PROGRAM TO USE TWO CLASSES AND INSTANCE VARIABLE

************************************************************************

import java.io.*;

class bank

{

int t;

void credit_balance()

{

int m=0;

System.out.println("CURRENT BALANCE IS :RS" + t);

try

{

BufferedReader a=new BufferedReader (new InputStreamReader(System.in));

System.out.println("ENTER AMOUNT TO BE CREDITED");

System.out.flush();

m=Integer.parseInt(a.readLine());

}

catch(IOException e)

{

System.out.println("THERE HAS BEEN AN EXCEPTION");

}

t=t+m;

System.out.println("BALANCE AFTER CREDIT IS RS" + t);

}

void debit_balance()




{

int m1=0;

System.out.println("CURRENT BALANCE IS :RS" + t);

try

{

BufferedReader a1=new BufferedReader (new InputStreamReader(System.in));

System.out.println("ENTER AMOUNT TO BE DEBITED");

System.out.flush();

m1=Integer.parseInt(a1.readLine());

}


{

System.out.println("THERE HAS BEEN AN EXCEPTION");

}

t=t-m1;

System.out.println("BALANCE AFTER DEBIT IS RS" + t);

}

}

class bankac

{


{

bank o=new bank();

o.t=1000;

o.credit_balance();

o.debit_balance();

}

}




OUTPUT:




************************************************************************

PROGRAM TO SHOW WORKING OF APPLET

************************************************************************

import java.applet.*;

import java.awt.*;

public class simple extends Applet

{

public void paint(Graphics g)

{

g.drawString("THIS IS A SIMPLE APPLET",200,200);

}

}

HTML FILE:

<html>

<body>

<applet code=simple width=200 height=200>

</applet>

</body>

</html>




OUTPUT:




************************************************************************

PROGRAM THAT IMPLEMENTS PARAMETER PASSING TO AN APPLET

************************************************************************


import java.awt.*;

public class parameter extends Applet

{

String s;

public void init()

{

s=getParameter("string");

}


{

g.drawString(s,100,100);

}




}

HTML FILE:

<html>

<body>

<applet code=parameter width=200 height=200>

<PARAM name=String value="HI,THIS IS RASHI">

</applet>

</body>

</html>

OUTPUT:




************************************************************************

PROGRAM USING ALIGN ATTRIBUTE IN APPLET

************************************************************************


import java.awt.*;

public class allign extends Applet

{

String s;

public void init()

{

s=getParameter("string");

}


{

g.drawString(s,100,100);

}




}

HTML FILE:

<html>

<body>

<applet code=allign width=200 height=200>

<PARAM name=String value="hello to everyone">

<ALIGN=LEFT>

</applet>

</body>

</html>

OUTPUT:







************************************************************************

PROGRAM TO DISPLAY NUMERICAL VALUES IN APPLETS

************************************************************************


import java.awt.*;

public class numerical extends Applet

{


{

int sum=10+30;

String s=String.valueOf(sum);

g.drawString("Addition of 10 and 30 gives"+s,100,100);

}

}

HTML FILE:

<html>

<body>

<applet code=numerical width=200 height=200>

</applet>

</body>

</html>




OUTPUT:




************************************************************************

PROGRAM TO WRITE BYTES INTO A FILE

************************************************************************

import java.io.*;

class wbytes

{


{

byte write[]={'R','A','S','H','I'};

FileOutputStream f1=null;

try

{

f1=new FileOutputStream("rashi.txt");

f1.write(write);

System.out.println("file is written");

f1.close();

}


{

System.out.println("there is an exception");

}

finally

{

try

{

f1.close();

}


{

System.out.println("catch my exception");

}

}

}

}




OUTPUT:




************************************************************************

PROGRAM FOR READING BYTES FROM A FILE

************************************************************************

import java.io.*;

class rbytes

{


{

FileInputStream f1=null;

int a;

try

{

f1=new FileInputStream("rashi.txt");

System.out.println("file contains:");

while((a=f1.read())!=-1)

{

System.out.println((char)a);

}

f1.close();

}


{


}

finally

{

try

{

f1.close();

}


{


}

}

}

}




OUTPUT:




************************************************************************

PROGRAM TO COPY BYTES FROM 1 FILE TO ANOTHER

************************************************************************

import java.io.*;

class cbyes

{


{

FileInputStream f1=null;

FileOutputStream f2=null;

byte a;

try

{

f1=new FileInputStream("rashi.txt");

f2=new FileOutputStream("rashi1.txt");

do

{

a=(byte)f1.read();

f2.write(a);

}

while(a!=-1);

System.out.println("file is copied");

}

catch(FileNotFoundException e)

{

System.out.println("file not found");

}


{

System.out.println(e.getMessage());

}

finally

{

try

{

f1.close();




f2.close();

}


{


}

}

}

}

OUTPUT:




************************************************************************

PROGRAM FOR WRITING CHARACTERS INTO A FILE

************************************************************************

import java.io.*;

class wcharacters

{


{

char a[]={'R','A','S','H','I'};

File f1=new File("rashi100.txt");

FileWriter o1=null;

try

{

o1=new FileWriter(f1);

o1.write(a);

System.out.println("file is written");

o1.close();

}


{


}

finally

{

try

{

o1.close();

}


{


}

}




}

}

OUTPUT:




************************************************************************

PROGRAM TO READ CHARACTERS FROM A FILE

************************************************************************

import java.io.*;

class rcharacters

{


{


FileReader o1=null;

try

{

o1=new FileReader(f1);

int ch;

System.out.println("file contains:");

while((ch=o1.read())!=-1)

{

System.out.println((char)ch);

}

o1.close();

}


{


}

finally

{

try

{

o1.close();




}


{


}

}

}

}

OUTPUT:




************************************************************************

PROGRAM TO COPY CHARACTERS FROM 1 FILE TO ANOTHER

************************************************************************

import java.io.*;

class ccharacters

{


{



FileReader o1=null;

FileWriter o2=null;

try

{

o1=new FileReader(f1);

o2=new FileWriter(f2);

int ch;

while((ch=o1.read())!=-1)

{

o2.write(ch);

}

System.out.println("file is copied");

}


{


}




finally

{

try

{

o1.close();

o2.close();

}


{

System.out.println("catch exception");

}

}

}

}

OUTPUT:




************************************************************************

import java.net.*;

class netdemo

{


{

try

{

InetAddress ia=InetAddress.getLocalHost();

System.out.println("IP address is "+ ia);

}

catch(UnknownHostException e)

{


}

}

}




************************************************************************

PROGRAM TO USE DIFFERENT METHODS OF GRAPHICS CLASS

************************************************************************


import java.awt.*;

public class funct extends Applet

{


{

g.setColor(Color.yellow);

g.fillOval(200,150,200,200);

g.setColor(Color.black);

g.drawOval(250,200,10,10);

g.drawOval(330,200,10,10);

g.drawLine(300,210,300,270);

g.setColor(Color.red);




g.drawArc(255,235,90,80,180,180);

g.setColor(Color.black);

g.drawString("SMILEY FACE",260,110);

}

}

HTML FILE:

<html>

<body>

<applet code=funct width=200 height=200>

</applet>

</body>

</html>

OUTPUT:




************************************************************************




PROGRAM THAT CAPTURES AND PROCESSES ALL THE MOUSE EVENTS

************************************************************************


import java.awt.*;

import java.awt.event.*;

public class mousedemo extends Applet implements

MouseListener,MouseMotionListener

{

String msg=null;

int x=0;

int y=0;

public void init()

{

addMouseListener(this);

addMouseMotionListener(this);

}

public void mouseEntered(MouseEvent e)

{

x=10;

y=20;

msg="mouse has been entered";

repaint();

}

public void mouseClicked(MouseEvent e)

{

x=10;

y=20;

msg="mouse has been clicked";

repaint();

}

public void mouseExited(MouseEvent e)

{

x=10;

y=20;

msg="mouse has been exited";

repaint();

}

public void mousePressed(MouseEvent e)

{

x=e.getX();

y=e.getY();

msg="down";

repaint();

}

public void mouseReleased(MouseEvent e)




{

x=e.getX();

y=e.getY();

msg="up";

repaint();

}

public void mouseDragged(MouseEvent e)

{

x=e.getX();

y=e.getY();

msg="mouse dragged";

showStatus("mouse dragged at" + x + "," + y);

repaint();

}

public void mouseMoved(MouseEvent e)

{

x=e.getX();

y=e.getY();

msg="mouse dragged";

showStatus("mouse moved at" + x + "," + y);

repaint();

}


{

g.drawString(msg,x,y);

}

}







************************************************************************

PROGRAM TO USE MULTIPLE CATCH STATEMENTS

************************************************************************

class excep2

{


{

try

{

int d=args.length;

int b=42/d;

int c[]={1};

c[10]=100;

System.out.println("THE VALUE OF C IS : " + c);

}

catch(ArithmeticException e1)

{

System.out.println("DIVIDE BY ZERO");

}

catch(ArrayIndexOutOfBoundsException e)

{

System.out.println("ARRAY OUT OF BOUNDS");

}

}

}




OUTPUT:




************************************************************************

PROGRAM TO PERFORM MULTITHREADING AND SET PRIORITY

************************************************************************

class mythread1 extends Thread

{

public void run()

{


{

System.out.println("thread1 is running");

}

System.out.println("exit from thread1");

}

}


{

public void run()

{


{

System.out.println("my thread2 is running");

}


}

}


{

public void run()

{


{

System.out.println("my thread3 is running");

}


}

}

class th

{





{

mythread1 mt1=new mythread1();



mt1.setPriority(Thread.MAX_PRIORITY);

mt2.setPriority(Thread.MIN_PRIORITY);

mt3.setPriority(mt2.getPriority()+4);

System.out.println(mt3.getPriority());

mt1.start();

mt2.start();

mt3.start();

}

}




OUTPUT:




************************************************************************

PROGRAM TO USE TRY,CATCH,FINALLY

************************************************************************

class excep1

{


{

try

{


System.out.println("The value of a is "+a);

int b=42/a;

System.out.println("The value of b is "+b);

}

catch(ArithmeticException e)

{

System.out.println("DIVIDE BY ZERO");

}

finally

{

System.out.println("HELLO");

}

}

}




OUTPUT:




************************************************************************

PROGRAM TO ADD NUMBER OF ELEMENTS PASSED IN AN ARRAY

************************************************************************

class array

{


{

int i,c=0;

for(i=0;i<args.length;i++)

{

c=c+Integer.parseInt(args[i]);

}

System.out.println("THE SUM IS: " + c);

}

}




OUTPUT:




************************************************************************

PROGRAM IMPLEMENTING INPUT TO AN APPLET

************************************************************************


import java.awt.*;

import java.awt.event.*;

public class event1 extends Applet implements ActionListener

{

TextField t1,t2,t3;

public void init()

{

t1=new TextField(10);

t2=new TextField(10);

add(t1);

add(t2);

t1.setText("0");

t2.setText("0");

t1.addActionListener(this);

t2.addActionListener(this);

}


{

int x,y,sum;

String s1,s2,s3;

g.drawString("ENTER TWO STRINGS",100,30);

try

{

s1=t1.getText();

x=Integer.parseInt(s1);




s2=t2.getText();

y=Integer.parseInt(s2);

sum=x+y;

s3=String.valueOf(sum);

g.drawString("THE SUM IS:",100,100);

g.drawString(s3,415,100);

}

catch(Exception e)

{


}

}

public void actionPerformed(ActionEvent e)

{

repaint();

}

}

OUTPUT:





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Java Practical File - educationjockey.comeducationjockey.com/wp-content/uploads/2016/02/javapractical.pdf · VISIT for old papers, practical file samples. This file is for reference