Simple And Advanced Java Programs

/* Simple Java Program for the implementation of ProgressBar, you can also refer to the progressbar code given beow and implement it in your programs */

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

class ProgressBarr extends JFrame implements ActionListener
{
JButton jb;
JProgressBar jpb1;
int value =0;
ProgressBarr()
{
Container contentPane=getContentPane();
contentPane.setLayout(new FlowLayout());

jb = new JButton("Click");
contentPane.add(jb);
jb.addActionListener(this);

jpb1 = new JProgressBar(0,1000);
contentPane.add(jpb1);
jpb1.setStringPainted(true);
}

public static void main(String args[])
{
ProgressBarr pb1 = new ProgressBarr();
pb1.setSize(500,500);
pb1.setVisible(true);
}

public void actionPerformed(ActionEvent ae)
{
while(value< =1000)
{
value = value+10;
jpb1.setValue(value);
}
}
}

/* Java Program :
Components included in this session : Buttons, Labels, Text Fileds, Combo Box and Menu Bar.

/* 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);
}
}

/* Java Program To Display A simple tree with root node as ENGINEERING and the courses under it as sub nodes or leaves. The program makes use of Frames. The Normal way of defining a tree node is 'DefaultMutableTreeNode root_name =new DefaultMutableTreeNode (argument_name)'.*/


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;

public class Tree1 extends JFrame
{
public static void main(String args[])
{
Tree1 frame = new Tree1(" A Tree");
frame.setSize(200,200);
frame.setVisible(true);
}
public Tree1(String title)
{
setTitle(title);
DefaultMutableTreeNode root=new DefaultMutableTreeNode ("Engineering");
DefaultMutableTreeNode style=new DefaultMutableTreeNode ("Information Technology");
root.add(style);
style=new DefaultMutableTreeNode("Electronics");
root.add(style);
style=new DefaultMutableTreeNode ("Computer Science");
root.add(style);
style=new DefaultMutableTreeNode ("Mechanical");
root.add(style);
style=new DefaultMutableTreeNode ("Electrical");
root.add(style);
style=new DefaultMutableTreeNode ("Sound");
root.add(style);

JTree jt=new JTree(root);
Container contentPane=getContentPane();
contentPane.add(new JScrollPane(jt));
}
}

/* 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>

/* 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>

/* 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>

/* 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>

/*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 >

/*************** 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());
}

}}

/* 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);
}
}

/* 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();
}
}

/* 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);
}
}
}

/* 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();
}
}

class Color
{
public static void main(String args[])
{
String a;
a =args[0];
switch(a)
{
case "r" :
System.out.println("Red");
break;

case "b" :
System.out.println("Blue");
break;

case "g" :
System.out.println("Green");
break;

case "y" :
System.out.println("Yellow");
break;

case "w" :
System.out.println("White");
break;

case "o" :
System.out.println("Orange");
break;
}
}
}

class Bubbesort
{
public static void main(String args[])
{
int sum, i,j,temp = 0;
int []a = new int[5];
for(i=0;i< 5;i++)
a[i] = Integer.parseInt(args[i]);

for(i=0;i< 5;i++)
{
for(j=i+1;j< 5;j++)
{
if (a[i] < a[j])
{
temp = a[i];
a[i] = a[j];
a[j] = temp;
}
}
}
for(i=0;i< 5;i++)
System.out.println(a[i]);
}
}