Vectors

/* Implementation Of Vectors */
import java.util.Vector;
import java.io.*;
public class MainClass extends Thread{
public static void main(String args[]) throws InterruptedException{
Vector v = new Vector();
int num,choice,ch;
boolean tr = true;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
try {
do {
System.out.println("1. Add Elements\n2. Delete Elements\n3. Display\n4. Exit");
choice = Integer.parseInt(br.readLine());
switch(choice) {
case 1:
System.out.println("Enter Element : ");
v.add(Integer.parseInt(br.readLine()));
break;
case 2:
int no;
System.out.println("Enter Element : ");
no = Integer.parseInt(br.readLine());
if(v.contains(no))
v.removeElement(no);
break;
case 3:
System.out.println(v);
break;
case 4:
System.out.println("Exiting Application....");
Thread.sleep(2000);
System.exit(0);
break;
default:
System.out.println("ERROR!!! INVALID OPTION!!!");
Thread.sleep(2000);
}
System.out.println("Do YOu want to continue (1 = yes: )");
ch = Integer.parseInt(br.readLine()); }
while(ch==1);
} catch(Exception e){
System.out.println("Error Message: "+e);
}
}}
/**** OutPut ******
1. Add Elements
2. Delete Elements
3. Display
4. Exit
1
Enter Element :
4
Do YOu want to continue (1 = yes: )
1
1. Add Elements
2. Delete Elements
3. Display
4. Exit
1
Enter Element :
6
Do YOu want to continue (1 = yes: )
1
1. Add Elements
2. Delete Elements
3. Display
4. Exit
1
Enter Element :
7
Do YOu want to continue (1 = yes: )
1
1. Add Elements
2. Delete Elements
3. Display
4. Exit
1
Enter Element :
5
Do YOu want to continue (1 = yes: )
1
1. Add Elements
2. Delete Elements
3. Display
4. Exit
3
[4, 6, 7, 5]
Do YOu want to continue (1 = yes: )
1
1. Add Elements
2. Delete Elements
3. Display
4. Exit
2
Enter Element :
7
Do YOu want to continue (1 = yes: )
1
1. Add Elements
2. Delete Elements
3. Display
4. Exit
3
[4, 6, 5]
Do YOu want to continue (1 = yes: )
1
1. Add Elements
2. Delete Elements
3. Display
4. Exit
4
Exiting Application.... */

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Threads

/* Implementation Of Threads */

import java.io.*;
import java.util.*;

class AA extends Thread
{
int i;
public void run()
{
System.out.println("Thread A");
for(i=0;i<5;i++)
{
System.out.println("Thread A : "+i);
yield();
}
}
}
class B extends Thread
{
int i;
public void run()
{
System.out.println("Thread B");
for(i=0;i<5;i++)
{
System.out.println("Thread B : "+i);
yield();
}
}

}
class C extends Thread
{
int i;
public void run()
{
System.out.println("Thread C");
for(i=0;i<5;i++)
{
System.out.println("Thread C : "+i);
yield();
}
}
}
class ThreadLionel
{
public static void main(String []args)
{
AA a = new AA();
B b = new B();
C c = new C();
a.start();
b.start();
c.start();
}
}
/*
--------------------OUTPUT--------------------
Thread A
Thread A : 0
Thread A : 1
Thread B
Thread B : 0
Thread C
Thread C : 0
Thread A : 2
Thread B : 1
Thread C : 1
Thread A : 3
Thread B : 2
Thread C : 2
Thread A : 4
Thread B : 3
Thread C : 3
Thread B : 4
Thread C : 4
*/

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Matrix Operations

/********** Implementation of Matrix Operation Using Arrays *********/
// Matrix Addtion, Subtraction, Transpose, Multiplication

import matrix;

class Matrix
{
public static void main(String args[])
{
int i,j,k;
int mat1 [][]={ {1,2,3}, {4,5,6}, {7,8,9} };
int mat2 [][]={ {10,11,12}, {13,14,15}, {16,17,18} };

//Matrix A
System.out.println("\nMatrix A:");
for(i=0;i< 3;i++)
{
for(j=0;j< 3;j++)
System.out.print("\t"+mat1[i][j]);
System.out.println("");
}

//Matrix B
System.out.println("\nMatrix B:");
for(i=0;i< 3;i++)
{
for(j=0;j< 3;j++)
System.out.print("\t"+mat2[i][j]);
System.out.println("");
}
System.out.println("\nOperation ON Matrices \n1.Addition \n");
int sum [][] = new int [3][3];
for(i=0;i< 3;i++)
{
for(j=0;j< 3;j++)
{
sum[i][j] = mat1[i][j] + mat2[i][j];
System.out.print("\t" + sum[i][j]);
}

System.out.println("");
}

System.out.println("2.Subtraction\n");
int diff[][] = new int[3][3];
for(i=0;i< 3;i++)
{
for(j=0;j< 3;j++)
{
diff [i][j] = mat1[i][j] - mat2[i][j];
System.out.print("\t"+ diff[i][j]);
}
System.out.println("");
}

System.out.println("3. Transpose Of A\n");
int trans[][] = new int[3][3];
for(i=0;i< 3;i++)
{
for(j=0;j< 3;j++)
{
trans [i][j] = mat1[j][i];
System.out.print("\t"+ trans[i][j]);
}
System.out.println("");
}
System.out.println("4.Multiplication\n");
int prod[][] = new int[3][3];
for(i=0;i< 3;i++)
{
for(j=0;j< 3;j++)
{
prod[i][j] = 0;
{
for(k=0;k< 3;k++)
prod[i][j] = prod[i][j]+mat1[i][k]*mat2[k][j];
}
System.out.print("\t"+ prod[i][j]);
}
System.out.println("");

}
}
}

/************* OUTPUT ***************



Matrix A:
1 2 3
4 5 6
7 8 9

Matrix B:
10 11 12
13 14 15
16 17 18

Operation ON Matrices
1.Addition

11 13 15
17 19 21
23 25 27
2.Subtraction

-9 -9 -9
-9 -9 -9
-9 -9 -9
3. Transpose Of A

1 4 7
2 5 8
3 6 9
4.Multiplication

84 90 96
201 216 231
318 342 366
*/

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Packages : Calculation of Simple and compound Interest

/* java program : implementation of packges...
Import a package in a class and use it. */

/*
First.java
*/

package pack;

public class First
{
static double amt,sim,comp,princ = 1000,rate = 0.09;
static int n=2;

public First()
{
System.out.println("\n...Welcome to First Class\n");
}

public static void DisplayData()
{
System.out.println("Principle Amount\t:"+princ+"\nRate Of Interest\t:"+rate*100+"%");
System.out.println("Term\t\t\t:"+n);
}
public static void SimpleInterest()
{
System.out.println("\nDisplaying Simple Interest...");
try
{
Thread.sleep(1000); // do nothing for 1000 miliseconds (1 second)
}
catch(InterruptedException e)
{
e.printStackTrace();
}
sim = (princ*n*rate);
System.out.println("\tInterest\t: "+sim);
}

public static void CompInterest()
{
System.out.println("\nDisplaying Compound Interest...");
try
{
Thread.sleep(1000); // do nothing for 1000 miliseconds (1 second)
}
catch(InterruptedException e)
{
e.printStackTrace();
}
double ans = princ*(1+rate/n);
comp = Math.pow(ans,(double)n*4.0);
System.out.println("\tInterest\t: "+comp);
}
/* public static void main(String []args)
{
First f= new First();
f.DisplayData();
f.SimpleInterest();
f.CompInterest();
}*/
}

/* The socond file imports the first file and calculates the interst*/
/*Second.java*/

import pack.First;

class Second
{
public static void main(String[] args)
{
System.out.println("Running Class Second..");
First first = new First();
first.DisplayData();
first.SimpleInterest();
first.CompInterest();
}
}

/* Output
* Running Class Second..
*
* ...Welcome to First Class
*
* Principle Amount :1000.0
* Rate Of Interest :9.0%
* Term :2
*
* Displaying Simple Interest...
* Interest : 180.0
* Displaying Compound Interest...
* Interest : 1.4221006128366082E24
*/

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Length Convertor

/* (Length Convertor): Simple Java Program to convert miles, kilometers, meter, feet, centimeter and inches
*/
Enter value for Miles: 45

Kilometer: 72.4185
Meter: 72418.5
Feet: 237593.50429815002
Inches: 2851122.0515778
Centimeter: 7241850.011007612

import java.io.*;

public class ConverterIO
{
public static void main(String[] args) throws IOException
{
BufferedReader dataIn = new BufferedReader(new InputStreamReader(System.in));
String strChoose;
int choose;
String strMiles, strKilometer, strMeter, strFeet, strInches, strCentimeter;
double miles, kilometer, meter,feet, inches, centimeter;
boolean done = false;
while (!done)
{
//Getting input from the user
println("\n\n\n\t\tLENGTH CONVERTER");
println("\n\tWhat you would like to convert?");
println("");
println("\t1) Miles 4) Feet");
println("\t2) Kilometer 5) Inches");
println("\t3) Meter 6) Centimeter");
println("\t\t 7) Exit");
print("\n\tEnter your choice: ");
strChoose = dataIn.readLine();
choose = Integer.parseInt(strChoose);

if ((choose < = 0) || (choose >= 8))
{
println("\tInvalid entry, please try again!");
}

switch (choose)
{
case 1:
print("\n\tEnter value for Miles: ");
strMiles = dataIn.readLine();
miles = Double.parseDouble(strMiles);
println("\n\t\tKilometer: " + (miles*1.6093));
println("\t\tMeter: " + (miles*1609.3));
println("\t\tFeet: " + (miles*5279.85565107));
println("\t\tInches: " + (miles*63358.26781284));
println("\t\tCentimeter: " + (miles*160930.0002446136));
break;

case 2:
print("\n\tEnter value for Kilometer: ");
strKilometer = dataIn.readLine();
kilometer = Double.parseDouble(strKilometer);
println("\n\t\tMiles: " + (kilometer*0.6213882));
println("\t\tMeter: " + (kilometer*1000));
println("\t\tFeet: " + (kilometer*3280.8399));
println("\t\tInches: " + (kilometer*39370.0788));
println("\t\tCentimeter: " + (kilometer*100000)); break;

case 3:
print("\n\tEnter value for Meter: ");
strMeter = dataIn.readLine();
meter = Double.parseDouble(strMeter);
println("\n\t\tMiles: " + (meter*621.3882));
println("\t\tKilometer: " + (meter*1000));
println("\t\tFeet: " + (meter*3.2808399));
println("\t\tInches: " + (meter*39.3700788));
println("\t\tCentimeter: " + (meter*100));
break;

case 4:
print("\n\tEnter value for Feet: ");
strFeet = dataIn.readLine();
feet = Double.parseDouble(strFeet);
println("\n\t\tMiles: " + (feet*0.0001893991176));
println("\t\tKilometer: " + (feet*0.0003048));
println("\t\tMeter: " + (feet*0.3048));
println("\t\tInches: " + (feet*12));
println("\t\tCentimeter: " + (feet*30.48));
break;

case 5:
print("\n\tEnter value for Inches: ");
strInches = dataIn.readLine();
inches = Double.parseDouble(strInches);
println("\n\t\tMiles: " + (inches*0.000015783254));
println("\t\tKilometer: " + (inches*0.000025349));
println("\t\tMeter: " + (inches*0.02534));
println("\t\tFeet: " + (inches*0.08333));
println("\t\tCentimeter: " + (inches*2.51));
break;

case 6:
print("\n\tEnter value for Centimeter: ");
strCentimeter = dataIn.readLine();
centimeter = Double.parseDouble(strCentimeter);
println("\n\t\tMiles: " + (centimeter*0.000006218797));
println("\t\tKilometer: " + (centimeter*0.000004));
println("\t\tMeter: " + (centimeter*0.004));
println("\t\tFeet: " + (centimeter*0.032808386877));
println("\t\tInches: " + (centimeter*0.3937008));
break;

case 7:
done = true;
println("\n\tThank you for using this program!");
println("\n\n");
break;

default: throw new NumberFormatException();

} // end switch
} // end while
} // end main

//short cut for print
private static void print(String s)
{
System.out.print(s);
}

//short cut for println
private static void println(String s)
{
System.out.println(s);
}
}

/* Output
LENGTH CONVERTER

What you would like to convert?

1) Miles 4) Feet
2) Kilometer 5) Inches
3) Meter 6) Centimeter
7) Exit

Enter your choice: 1

Enter value for Miles: 45

Kilometer: 72.4185
Meter: 72418.5
Feet: 237593.50429815002
Inches: 2851122.0515778
Centimeter: 7241850.011007612


LENGTH CONVERTER

What you would like to convert?

1) Miles 4) Feet
2) Kilometer 5) Inches
3) Meter 6) Centimeter
7) Exit

Enter your choice: 5

Enter value for Inches: 48.5

Miles: 7.65487819E-4
Kilometer: 0.0012294265
Meter: 1.22899
Feet: 4.041505
Centimeter: 121.73499999999999


LENGTH CONVERTER

What you would like to convert?

1) Miles 4) Feet
2) Kilometer 5) Inches
3) Meter 6) Centimeter
7) Exit

Enter your choice: 7

Thank you for using this program!
*/

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Bubble Sort

/* Java program on Arrays - Bubble sort on numbers
*/

import java.io.*;
class Bubble
{
public static void main(String args[]) throws IOException
{
int num;
System.out.println("Program to demonstrate bubble sort");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter the number of elements to be entered <10");
num=Integer.parseInt(br.readLine());
System.out.println("Enter the numbers to be sorted");
int arr[]=new int[10];

for(int i=0;i< num;i++)
{
arr[i]=Integer.parseInt(br.readLine());
}
System.out.println("The number you have entered:");
for(int i=0;i< num;i++)
{
System.out.println(arr[i]);
}
for(int i=0;i< num;i++)
{
for(int j=i+1;j< num;j++)
{
if(arr[i]>arr[j])
{
int temp=arr[i];
arr[i]=arr[j];
arr[j]=temp;
}
}
}
System.out.println("The sorted numbers are");
for(int i=0;i< num;i++)
{
System.out.println(arr[i]);
}

}
}
 

/********* Output **********

Program to demonstrate bubble sort
Enter the number of elements to be entered <10
5
Enter the numbers to be sorted
8
65
14
23
2
The number you have entered:
8
65
14
23
2
The sorted numbers are
2
8
14
23
65

*/

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Read A File

/***** Java Program to read a file and display it on the screen */

import java.io.*;
public class LioFile
{
public static void main(String args[])
{
try
{
FileReader fr=new FileReader("LioFile.java");
BufferedReader br=new BufferedReader(fr);
String str=" ";
String s1 =" ";
System.out.println(" s1 is "+s1.equals("ass"));

while((str=br.readLine())!=null)
{
System.out.println(str);
}
}
catch(FileNotFoundException fe)
{
fe.printStackTrace();
}
catch(IOException e)
{
e.printStackTrace();
}
}
}

/**** Output ***
s1 is false
import java.io.*;
public class J7
{
public static void main(String args[])
{
try
{
FileReader fr=new FileReader("J7.java");
BufferedReader br=new BufferedReader(fr);
String str=" ";
String s1 =" ";
System.out.println(" s1 is "+s1.equals("ass"));

while((str=br.readLine())!=null)
{
System.out.println(str);
}
}
catch(FileNotFoundException fe)
{
fe.printStackTrace();
}
catch(IOException e)
{
e.printStackTrace();
}


}
}
*/

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Function Overloading

/* Function Overloading program in java. The program overloads the area() function and calculates the area for square, rectangle and triangle */

class overloading
{
double area,root;
//Area Of Square
public void Area(double a)
{
area = a*a;
System.out.println("The Area Of Square : " +area);
}

// Area of rectangle
public void Area(double a,double b)
{
area= a*b;
System.out.println("The Area Of Rectangle : " +area);
}

// Aera Of Triangle
public void Area(double a,double b,double c)
{
double s= (a+b+c);
root = s*(s-a)*(s-b)*(s-c);
area = Math.sqrt(root);
System.out.println("The Area Of Triangle : " +area);
}

public static void main(String args[])
{
overloading ar = new overloading();
ar.Area(5.65);
ar.Area(5.32,43.2);
ar.Area(4,7,7);
}
}
/* Output
The Area Of Square : 31.922500000000003
The Area Of Rectangle : 229.82400000000004
The Area Of Triangle : 174.61958653026298 */

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Type Casting

/* Simple Type casting program */
class cast
{
public static void main(String args[])
{
double a=5.35, b=55.6;
int rem;
rem = (int)a% (int)b;
System.out.println("Remainder : "+rem);
}
}

/* Output
Remainder : 5 */

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Java Program To Find Whether a Number is Armstrong

/* Simple Java program to find whether a number is an armstrong number or not */


class Armstrong
{
int sumcube(int x)
{
int dig,sum = 0;
while(x >= 1)
{
dig = x % 10;
sum = sum + dig * dig * dig;
x = x / 10;
}
return(sum);
}
void display(int n)
{
if(sumcube (n)==n)
System.out.println(n + " is Armstrong Number");
else
System.out.println(n + " is not Armstrong Number");
}
void disp()
{
int x = 0,y = 0;
for(int k = x;k <= y;k++)
if(sumcube (k)==k)
System.out.println(k);
}
}

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Grid Layout

/* Java Program To Make Use of grid layout to displaying components onto the applet. The Components Includes Buttons Text Boxes,Check Boxes. Done using Applets. */

import java.awt.*;
import java.applet.*;

public class GridApp extends Applet
{
TextArea ta;
TextField tf;
Button b1,b2;
CheckboxGroup cbg;
Checkbox cb1,cb2,cb3,cb4;
GridBagLayout gb;
GridBagConstraints gbc;

public void init()
{
gb = new GridBagLayout();
setLayout(gb);
gbc = new GridBagConstraints();
ta = new TextArea("TextArea",5,10);
tf = new TextField("Enter your Name:");
b1 = new Button ("TextArea");
b2 = new Button ("TextField");
cbg = new CheckboxGroup();
cb1 = new Checkbox("Bold",cbg, false);
cb2 = new Checkbox("Italic",cbg,false);
cb3 = new Checkbox("Plain",cbg,false);
cb4 = new Checkbox("Bold/Italic",cbg,true);

gbc.fill = GridBagConstraints.BOTH;
addComponent(ta,0,0,4,1);
gbc.fill = GridBagConstraints.HORIZONTAL;
addComponent(b1,0,1,1,1);
gbc.fill = GridBagConstraints.HORIZONTAL;
addComponent(b2,0,2,1,1);
gbc.fill = GridBagConstraints.HORIZONTAL;
addComponent(cb1,2,1,1,1);
gbc.fill = GridBagConstraints.HORIZONTAL;
addComponent(cb2,2,3,1,1);
gbc.fill = GridBagConstraints.HORIZONTAL;
addComponent(cb3,1,1,1,1);
gbc.fill = GridBagConstraints.HORIZONTAL;
addComponent(cb4,3,2,1,1);
gbc.fill = GridBagConstraints.HORIZONTAL;
addComponent(tf,4,0,1,3);
}
public void addComponent(Component c, int row, int col, int nrow, int ncol)
{
gbc.gridx = col;
gbc.gridy = row;
gbc.gridwidth = ncol;
gbc.gridheight = nrow;
gb.setConstraints(c,gbc);
add(c);
}
}
//< applet code =GridApp width = 500 height = 500>< /applet>

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Flow Layout

/* Java Program On Flow Layout. The Components Inclues Buttons, TextField, label. Done using Applets.*/

import java.awt.*;
import java.applet.*;

public class FlowApp extends Applet
{
public void init()
{
TextField t1 = new TextField(20);
Label l1 = new Label ("Name");
Button b = new Button("OK");
TextField t2 = new TextField(20);
Label l2 = new Label ("Name");
Button b1 = new Button("OK");
add(l1);
add(t1);
add(b);
add(l2);
add(t2);
add(b1);
}}

//< applet code =FlowApp width = 500 height = 500>< /applet>

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Button Display

/* Java Program To Display Button On An Applet . Done using Applets.*/

import java.awt.*;
import java.applet.*;

public class BorderApp extends Applet
{
public void init()
{
setLayout(new BorderLayout());
Button b1 = new Button("EAST");
Button b2 = new Button("WEST");
Button b3 = new Button("NORTH");
Button b4 = new Button("SOUTH");
Button b5 = new Button("CENTER");
add("East",b1);
add("West",b2);
add("North",b3);
add("South",b4);
add("Center",b5);
}
}
//< applet code =BorderApp width = 500 height = 500>< /applet>

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Draw Image

/* Java Program To Draw Image on the applet. Done using Applets. */

import java.awt.*;
import java.applet.*;

public class AppletImage extends Applet
{
Image img;
public void init()
{
String imagename= getParameter("Whilder e Pool");
img = getImage(getCodeBase(),imagename);
}
public void paint(Graphics c)
{
c.drawImage(img,10,10,this);
}
}

//< applet code = AppletImage width = 770 Height = 555>
//< param name = "Whilder e pool " value = "madonnablue6bp.gif">
//< /applet>

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Color Program

/*Java Program To Display Simple Text on the applet, making use of Color class. Done using Applets. */

import java.awt.*;
import java.applet.*;

public class AppletColor extends Applet
{
public void paint(Graphics c)
{
setBackground(Color.blue);
c.setColor(Color.white);
c.drawString("Lionel Is a Cool Boy",100,50);
}
}

//< code =" AppletColor" width =" 350" height =" 150">< / applet >

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DES Program

/*************** DES **************
*The program listed below, testDES.java:
takes the DES key input and a text string (to be encrypted) from the program itself (not from a file),

encrypts the string (to produce the ciphertext), writes the key and the ciphertext to a file DES.out, decrypts the ciphertext (still in computer memory), and writes the resulting plaintext string to the file.

In this example, we see see the following three numbers:

DES key: 3812A419C63BE771

Plaintext: 0101010101010101 0102030405060708 090A0B0C0D0E0F10 1112131415161718

Ciphertext: 3A2EAD12F475D82C 1FC97BB9A6D955E1 EA5541946BB4F2E6 F29555A6E8F1FB3C */

import java.io.*;
import java.security.*;
import java.math.*;
import cryptix.util.core.BI;
import cryptix.util.core.ArrayUtil;
import cryptix.util.core.Hex;
import cryptix.provider.key.*;


class testDES {

public static void main (String[] args) {

try {
FileOutputStream outFile1 = new FileOutputStream("DES.out");
// Note: PrintStream is deprecated, but still works fine in jdk1.1.7b
PrintStream output1 = new PrintStream(outFile1);

// convert a string to a DES key and print out the result
RawSecretKey key2 = new RawSecretKey("DES",Hex.fromString("3812A419C63BE771"));
RawKey rkey = (RawKey) key2;
byte[] yval = rkey.getEncoded();
BigInteger Bkey = new BigInteger(yval);
String w = cryptix.util.core.BI.dumpString(Bkey);
output1.println("The Encryption Key = " + w);

// use the DES key to encrypt a string
Cipher des=Cipher.getInstance("DES/ECB/NONE","Cryptix");
des.initEncrypt(key2);
byte[] ciphertext = des.crypt(Hex.fromString("01010101010101010102030405060708090A0B0C0D0E0F101112131415161718"));

// print out length and representation of ciphertext
output1.print("\n");
output1.println("ciphertext.length = " + ciphertext.length);

BigInteger Bciph = new BigInteger(ciphertext);
w = cryptix.util.core.BI.dumpString(Bciph);
output1.println("Ciphertext for DES encryption = " + w);

// decrypt ciphertext
des.initDecrypt(key2);
ciphertext = des.crypt(ciphertext);
output1.print("\n");
output1.println("plaintext.length = " + ciphertext.length);

// print out representation of decrypted ciphertext
Bciph = new BigInteger(ciphertext);
w = cryptix.util.core.BI.dumpString(Bciph);
output1.println("Plaintext for DES encryption = " + w);

output1.println(" ");
output1.close();

} catch (Exception e) {
System.err.println("Caught exception " + e.toString());
}

}}

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Find Sum Of Digits Of A Number

/* Simple Java Program To Find the Sum of digits of number */

class SumDigit
{
public static void main(String args[])
{
int sum, i,a,d;
a = Integer.parseInt(args[0]);
sum = 0;
for(i=1;i< =10;i++)
{
d = a%10;
a = a/10;
sum=sum + d;
}
System.out.println("Sum of Digit :"+sum);
}
}

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Student Details

/* Simple Java Program For Displaying Name, Roll no. MArks and total of a student*/

class stud
{
public static float tot;
public static int rno;
public static String name;
public static int m1,m2,m3;

public void calc()
{
tot=(m1+m2+m3)/3;
}
public void op()
{
System.out.println("rollno="+rno);
System.out.println("name="+name);
System.out.println("%="+tot);
}
public static void main(String args[])
{
stud s=new stud();
rno=Integer.parseInt(args[0]);
name=args[1];
m1=Integer.parseInt(args[2]);
m2=Integer.parseInt(args[3]);
m3=Integer.parseInt(args[4]);

s.calc();
s.op();
}
}

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Employee Salary

/* Simple Java Program For Deciding Employee Salary Depending On His Designation*/

class Salary2
{
public static void main(String args[])
{
float gross,bs,hre,da;
bs = Integer.parseInt(args[0]);

if(bs >15000)
{
hre = 0.3f* bs;
da = 0.2f*bs;
gross = bs + hre + da;
System.out.println("Gross Salary : "+ gross);
}
else if(bs >10000)
{
hre = 0.4f* bs;
da = 0.3f*bs;
gross = bs + hre + da;
System.out.println("Gross Salary : "+ gross);
}
else if(bs >5000)
{
hre = 0.3f* bs;
da = 0.2f*bs;
gross = bs + hre + da +500;
System.out.println("Gross Salary : "+ gross);
}
}
}

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Employee Details and Salary

/* Simple Java Program For Displaying Emplayee Details : NAme, Id No. Designation, and depending on designation deciding the salary Of the Employee*/

class emp
{
public static int emp_no;
public static String name;
public static String designation;
public void showdata()
{
System.out.println("Employee number:--->"+emp_no);
System.out.println("Employee name:------>"+name);
System.out.println("Employee designation:--->"+designation);
}
}

class salary extends emp
{
public static float bsal,hr,da,tsal;
public void cal()
{
tsal=bsal+hr+da;
System.out.println("Total salary:---->"+tsal);
}
}

class empsal extends salary
{
public void calc()
{
if (bsal >=15000)
{
hr=0.3f*bsal;
da=0.2f*bsal;
}
else if (bsal >=10000)
{
hr=0.4f*bsal;
da=0.3f*bsal;
}
else
hr=0.3f*bsal+500;
da=0.2f*bsal+500;
}
public static void main(String args[])
{
empsal E=new empsal();
emp_no=Integer.parseInt(args[0]);
name=args[1];
designation=args[2];
bsal=Integer.parseInt(args[3]);
E.showdata();
System.out.println("Employee Salary");
E.calc();
E.cal();
}
}

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