Saturday 14 February 2015

Package in Java

// A simple package

package MyPack;

public class Balance{
    String name;
    double bal;

public Balance(String n, double b){
    this.name=n;
    this.bal=b;
    }

public void show(){
    if(bal<0)
    System.out.print("LESS THAN ZERO BALANCE -->");
    System.out.println(name +": $" +bal);
    }
}

-------------------------------------------------------------------------------------------------------------------
import MyPack.Balance;

class AccountBalance{
    public static void main(String args[]){
        Balance current[] = new Balance[3];

        current[0] = new Balance("SAIKUMAR S", 502.53);
        current[1] = new Balance("RAJESH M", 268.06);
        current[2] = new Balance("MURALI S ", -12.33);

        for (int i=0;i<3;i++)
        current[i].show();
        }
}//For Compilation javac -d . Balance.java (because package)

javac AccountBalance.java

java AccountBalance

Static members in java

class staticdemo{
int objno;
static int objcnt;

void hitcount(){
objno = ++objcnt;
}

void showhits(){
System.out.println("This page has been hit for :"+objcnt);
}

void showposition(){
System.out.println("client"+objno +"/" +objcnt);
}
}
public class Static {

    public static void main(String[] args) {
    staticdemo s = new staticdemo();
    staticdemo t = new staticdemo();
    staticdemo v = new staticdemo();

    s.hitcount();
    t.hitcount();
    v.hitcount();
    v.showhits();

    s.showposition();
    t.showposition();
    v.showposition();
    }
}

Method Overloading in java program

class Test{
int area(int i){
return i*i;
}

int area(int a, int b){
return a*b;
}

}
public class MethodOverloading {

        public static void main(String[] args) {

            Test t = new Test();
            int area;
            area = t.area(5);

            System.err.println("Area of a square is :"+area);

            area = t.area(5,6);
            System.out.println("Area of a rectangle is :"+area);
    }
}

Multiple if else statement using java(if stmt else condition)

import java.util.*;

public class Condition {

    public static void main(String[] args) {
      int a[]= new int[1] ;
            Scanner sc=new Scanner(System.in);
            System.out.println("Please enter elements between 0 and 6");
            for(int j=0;j<1;j++)
                a[j] = sc.nextInt();

            for(int j=0;j<1;j++)
                if(a[j]==0)
                {
                System.out.println("Sunday!");
                 break;}
                else if(a[j]==1)
                {
                    System.out.println("Monday!");
                 break;}
                else if(a[j]==2)
                {
                System.out.println("Tuesday!");
                 break;}
                else if(a[j]==3)
                {
                    System.out.println("Wednesday!");
                 break;}
                else if(a[j]==4)
                {
                System.out.println("Thursday!");
                break; }
                 else if(a[j]==5)
                {
                    System.out.println("Friday!");
                 break;}
                else if(a[j]==6)
                {
                System.out.println("Saturday!");
                 break;}
                else
                {
                System.out.println("Sorry Invallid option! Enter the number between the range 0 to 6");
              break; }

}
}

Java button applet program

import java.awt.*;
public class ButtonActionsTest extends java.applet.Applet {

public void init() {

setBackground(Color.white);
add(new Button("Red"));
add(new Button("Blue"));
add(new Button("Green"));
add(new Button("White"));
add(new Button("Black"));
}
public boolean action(Event evt, Object arg) {
if (evt.target instanceof Button)
changeColor((String)arg);
return true;
}
void changeColor(String bname) {
if (bname.equals("Red")) setBackground(Color.red);
else if (bname.equals("Blue")) setBackground(Color.blue);
else if (bname.equals("Green")) setBackground(Color.green);
else if (bname.equals("White")) setBackground(Color.white);
else setBackground(Color.black);
}
}

Inheritance Example Color box in java

import java.awt.Graphics;

import java.awt.Color;

public class ColorBoxes extends java.applet.Applet {

public void paint(Graphics g) {
int rval, gval, bval;

for (int j = 30; j < (this.size().height -25); j += 30)
for (int i = 5; i < (this.size().width -25); i+= 30) {
rval = (int)Math.floor(Math.random() * 256);
gval = (int)Math.floor(Math.random() * 256);
bval = (int)Math.floor(Math.random() * 256);

g.setColor(new Color(rval,gval,bval));
g.fillRect(i,j,25,25);
g.setColor(Color.black);
g.drawRect(i-1,j-1,25,25);
}
}
}

Program for Vowels And Consonants

public class VowelsAndConsonants {
public static void main(String[] args) {
    for(int i = 0; i < 100; i++) {
      char c = (char)(Math.random() * 26 + 'a');
      System.out.print(c + ": ");
      switch(c) {
      case 'a':
      case 'e':
      case 'i':
      case 'o':
      case 'u':
                System.out.println("vowel");
                break;
      case 'y':
      case 'w':
                System.out.println(
                  "Sometimes a vowel");
                break;
      default:
                System.out.println("consonant");
      }
    }
}
}

Label in Java

import java.awt.*;
public class ColorTest extends java.applet.Applet {
ColorControls RGBcontrols, HSBcontrols;
Canvas swatch;
public void init() {
Color theColor = new Color(0,0,0);
float[] HSB = Color.RGBtoHSB(theColor.getRed(),
theColor.getGreen(), theColor.getBlue(),
(new float[3]));
setLayout(new GridLayout(1,3,10,10));
// The color swatch
swatch = new Canvas();
swatch.setBackground(theColor);
// the control panels
RGBcontrols = new ColorControls(this,"Red", "Green", "Blue",theColor.getRed(), theColor.getGreen(),theColor.getBlue());
HSBcontrols = new ColorControls(this,"Hue", "Saturation", "Brightness",(int)(HSB[0] * 360), (int)(HSB[1] * 100),(int)(HSB[2] * 100));
add(swatch);
add(RGBcontrols);
add(HSBcontrols);
}
public Insets insets() {
return new Insets(10,10,10,10);
}
void update(ColorControls in) {
Color c;
String v1 = in.f1.getText();
String v2 = in.f2.getText();
String v3 = in.f3.getText();
if (in == RGBcontrols) { // change to RGB
c = new Color(Integer.parseInt(v1),
Integer.parseInt(v2),
Integer.parseInt(v3));
swatch.setBackground(c);

float[] HSB = Color.RGBtoHSB(c.getRed(),c.getGreen(),
c.getBlue(), (new float[3]));
HSB[0] *= 360;
HSB[1] *= 100;
HSB[2] *= 100;
HSBcontrols.f1.setText(String.valueOf((int)HSB[0]));
HSBcontrols.f2.setText(String.valueOf((int)HSB[1]));
HSBcontrols.f3.setText(String.valueOf((int)HSB[2]));
}
else { // change to HSB
int f1 = Integer.parseInt(v1);
int f2 = Integer.parseInt(v2);
int f3 = Integer.parseInt(v3);
c = Color.getHSBColor((float)f1 / 360,
(float)f2 / 100, (float)f3/100);
swatch.setBackground(c);
RGBcontrols.f1.setText(String.valueOf(c.getRed()));
RGBcontrols.f2.setText(String.valueOf(
c.getGreen()));
RGBcontrols.f3.setText(String.valueOf(c.getBlue()));
}
}
}
class ColorControls extends Panel {
TextField f1, f2, f3;
ColorTest outerparent;
ColorControls(ColorTest target,
String l1, String l2, String l3,
int v1, int v2, int v3) {
this.outerparent = target;
setLayout(new GridLayout(3,4,10,10));
f1 = new TextField(String.valueOf(v1),10);
f2 = new TextField(String.valueOf(v2),10);
f3 = new TextField(String.valueOf(v3),10);
add(new Label(l1, Label.RIGHT));
add(f1);
add(new Label(l2, Label.RIGHT));
add(f2);
add(new Label(l3, Label.RIGHT));
add(f3);
}
public Insets insets() {
return new Insets(10,10,0,0);
}
public boolean action(Event evt, Object arg) {
if (evt.target instanceof TextField) {

this.outerparent.update(this);

// retrue true;
}
// else return false;
}
}

Swings in Java for a Label

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

/* <applet code="JLabelDemo" width=355 height=200>
</applet>
*/

public class JLabelDemo extends JApplet{

public void init() {
// Get content pane
Container contentPane = getContentPane();

// Create an icon
ImageIcon ii = new ImageIcon("sateesh.jpg");

// Create a label
JLabel jl = new JLabel ("AVUL KALAM", ii, JLabel.CENTER);

// Add label to the content pane
contentPane.add(jl);
}
}

Simple Operators in Java Break And Continue

public class BreakAndContinue {

public static void main(String[] args) {

for(int i = 0; i < 100; i++) {
      if(i == 74) break; // Out of for loop
      if(i % 9 != 0) continue; // Next iteration
      System.out.println(i);
    }
    int i = 0;
    // An "infinite loop":
    while(true) {
      i++;
      int j = i * 27;
      if(j == 1269) break; // Out of loop
      if(i % 10 != 0) continue; // Top of loop
      System.out.println(i);
    }
}
}

Conditional operator ?: (Ternary operator) in JAVA

class BigNo
{
     public static void main (String args[])
    {

          int a = Integer.parseInt(args[0]);
          int b = Integer.parseInt(args[1]);
          int c = Integer.parseInt(args[2]);
          int x = (a>b)?(a>c?a:c):(b>c?b:c);

          System.out.println(+x);
      }
}

How to Read values through(via) keyboard using Scanner

import java.util.*;

public class Array

{

public static void main(String args[])

{

int[] a=new int[6];

Scanner sc=new Scanner(System.in);

System.out.println("Please enter elements...");

for(int j=0;j<6;j++)

a[j]=sc.nextInt();

System.out.println("Array elements are : ");

for (int i=0;i<a.length;i++)

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

}

Program on how to copy data from one array to another array

public class CopyArray {
   public static void main(String[] args) {
       int array1[]= {2,3,4,5,8,9};
        int array2[] = new int[6];
        System.out.println("array:");
       System.out.print("[");
        for (int i=0; i<array1.length; i++){
           System.out.print(" "+array1[i]);
       }
       System.out.print("]");
       System.out.println("\narray1:");
       System.out.print("[");
       for(int j=0; j<array1.length; j++){
           array2[j] = array1[j];
           System.out.print(" "+ array2[j]);
       }
       System.out.print("]");
   }
}

Java program for an Array

import java.util.*;

public class ArrayDemo{
public static void main(String[] args){
int num[] = {50,20,45,82,25,63};
int l = num.length;
int i,j,t;
System.out.print("Given number : ");
for (i = 0;i < l;i++ ){
System.out.print(" " + num[i]);
}
System.out.println("\n");
System.out.print("Accending order number : ");
Arrays.sort(num);
for(i = 0;i < l;i++){
System.out.print(" " + num[i]);
}
}
}

JAVA Program for Constructor

class BoxDemo {
double width;
double height;
double depth;

// this is a constructor for Box
    BoxDemo(){
    System.out.println("Constructing BoxDemo");
    width =10;
    height =10;
    depth =10;
    }
    //compute and return value
    double volume(){
    return width*height*depth;
    }
}

class Box{
    public static void main(String[] args) {
        BoxDemo mybox = new BoxDemo();

        double vol;
        // get the volume of the box

        vol = mybox.volume();

        System.out.println("VOLUME IS "+vol);
      }
}

// output : Constructing BoxDemo
//             VOLUME IS 1000.0

Constructor in JAVA (Parametrized)

class Box{
double width;
double height;
double depth;
//this is the constructor for Box

        Box(double w, double h, double d)
        {
        width = w;
        height = h;
        depth = d;
        }
// compute and return value
        double volume()
        {
        return width*height*depth;
        }
}

    class BoxParConst{
    public static void main(String args[]){
// declare allocate and initialize Box objects

    Box mybox1 = new Box(10,20,15);
    Box mybox2 = new Box(3,6,9);

    double vol;

// get the volume of first box

    vol = mybox1.volume();
    System.out.println("Volume of the first Box is:"+vol);

// get the volume of second box

    vol = mybox2.volume();
    System.out.println("Volume of the second Box is:"+vol);

    }
}

Program demo on How to Read a value through key board and print the factorial of a given number

import java.io.*;

class Fact{
    public static void main(String args[]){

    BufferedReader Br = new BufferedReader(new InputStreamReader(System.in));
try{

    int fact=1;

        System.out.println("Enter a number to find out factorial of a given number: \n" );
        String nu = Br.readLine();
        int n = Integer.parseInt(nu);

        for(int i=2;i<=n;i++)
        {
            fact=fact*i;

        }

            System.out.println("Factorial of a given number is:" +fact);

    }catch (IOException err){
            System.out.println("Error reading line");
            }

    }
}

Program to convert a string from lower case to upper case

import java.lang.*;
import java.io.*;
public class key
{
public static void main(String args[])throws IOException
{
try
{
   BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
   System.out.println("enter the input from the key board");
   String str=br.readLine();
   System.out.println("Data enterd is "+str.toUpperCase());
   }
   catch(Exception e)
   {
   System.out.println(e);
   }
   }
   }

Switch case simple program

class SwitchDemo
{
public static void main(String args[])
{
int month=Integer.parseInt(args[0]);
switch(month)
{
case 1: System.out.println("January");break;
case 2: System.out.println("February");break;
case 3: System.out.println("March");break;
case 4: System.out.println("April");break;
case 5: System.out.println("May");break;
case 6: System.out.println("June");break;
case 7: System.out.println("July");break;
case 8: System.out.println("August");break;
case 9: System.out.println("September");break;
case 10: System.out.println("October"); break;
case 11: System.out.println("November"); break;
case 12: System.out.println("October"); break;

default: System.out.println("Sorry ! invallied choice");break;
}
}
}

JAVA Program for Combo Box using applet .

Attach the image part also using some image file

//JComboBox Demo
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/*
<applet code="JComboBoxDemo" width=300 height=100>
</applet>
*/

public class JComboBoxDemo extends JApplet
implements ItemListener {

JLabel jl;
ImageIcon Flowers, Koala, Desert, Penguins, sateesh;

public void init(){
// Get content pane
Container contentPane = getContentPane();
contentPane.setLayout(new FlowLayout());

// Create a Combo box and add it
//to the pane
JComboBox jc = new JComboBox();
jc.addItem("Flowers");
jc.addItem("Koala");
jc.addItem("Desert");
jc.addItem("Penguins");
jc.addItem("sateesh");
jc.addItemListener(this);
contentPane.add(jc);

//Create label
jl = new JLabel(new ImageIcon("Flowers.gif")); //attach image here
contentPane.add(jl);
}

public void itemStateChanged(ItemEvent ie) {
String s = (String)ie.getItem();
jl.setIcon(new ImageIcon(s +".gif"));
}
}

Program to create Check box in Java

This java program is used for displaying a clicked item in a text box

compiling: javac JCheckBoxDemo.java
Run: appletviewer JCheckBoxDemo.java

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

/*

<applet code="JCheckBoxDemo" width=500 height=60>
</applet>

*/

public class JCheckBoxDemo extends JApplet
implements ItemListener {
JTextField jtf;

public void init(){

//Get content pane
Container contentPane = getContentPane();
contentPane.setLayout(new FlowLayout());

// Create icons
ImageIcon normal = new ImageIcon ("normal.gif");
ImageIcon rollover = new ImageIcon ("rollover.gif");
ImageIcon selected = new ImageIcon ("selected.gif");

// Add check boxes to the content pane
JCheckBox cb = new JCheckBox("C", normal);
cb.setRolloverIcon(rollover);
cb.setSelectedIcon(selected);
cb.addItemListener(this);
contentPane.add(cb);

cb = new JCheckBox("C++", normal);
cb.setRolloverIcon(rollover);
cb.setSelectedIcon(selected);
cb.addItemListener(this);
contentPane.add(cb);

cb = new JCheckBox("Java", normal);
cb.setRolloverIcon(rollover);
cb.setSelectedIcon(selected);
cb.addItemListener(this);
contentPane.add(cb);

cb = new JCheckBox("Perl", normal);
cb.setRolloverIcon(rollover);
cb.setSelectedIcon(selected);
cb.addItemListener(this);
contentPane.add(cb);

cb = new JCheckBox("VB", normal);
cb.setRolloverIcon(rollover);
cb.setSelectedIcon(selected);
cb.addItemListener(this);
contentPane.add(cb);

// Add text field to the content pane
jtf = new JTextField(15);
contentPane.add(jtf);
}

public void itemStateChanged(ItemEvent ie) {
JCheckBox cb = (JCheckBox)ie.getItem();
jtf.setText(cb.getText());
}
}

Java demo program for on Button using Applet

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

/*
<applet code="JRadioButtonDemo" width=500 height=50>
</applet>
*/

public class JRadioButtonDemo extends JApplet
implements ActionListener {
JTextField jtf;

public void init(){

// Get content pane
Container contentPane = getContentPane();
contentPane.setLayout(new FlowLayout());

// ADD radio buttons to content pane
JRadioButton b1 = new JRadioButton("B.Sc");
b1.addActionListener(this);
contentPane.add(b1);

JRadioButton b2 = new JRadioButton("M.Sc");
b2.addActionListener(this);
contentPane.add(b2);

JRadioButton b3 = new JRadioButton("B.Tech");
b3.addActionListener(this);
contentPane.add(b3);

JRadioButton b4 = new JRadioButton("M.Tech");
b4.addActionListener(this);
contentPane.add(b4);

JRadioButton b5 = new JRadioButton("M.C.A");
b5.addActionListener(this);
contentPane.add(b5);

// Define a button group
ButtonGroup bg = new ButtonGroup();
bg.add(b1);
bg.add(b2);
bg.add(b3);
bg.add(b4);
bg.add(b5);

// Add text field to the content pane
jtf = new JTextField(15);
contentPane.add(jtf);
}
public void actionPerformed(ActionEvent ae){
jtf.setText(ae.getActionCommand());
}
}

Java text field or you ca say a Text Box

compilation: javac JTextFieldDemo.java
Run: appletviewer JTextFieldDemo.java

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

/* <applet code="JTextFieldDemo" width=200 height=50>
</applet>
*/

public class JTextFieldDemo extends JApplet{

public void init() {

// Get content pane
Container contentPane = getContentPane();

//Creating a Text filed
JTextField jtf = new JTextField(JTextField.CENTER);

// Add text field to content pane
contentPane.add(jtf);

}
}

Java program on Harmonic Series(HM)

class Harmonic
{
public static void main (String args[])
{
int k,n=3;
double i=1,s,f=0;
while(i<=n)
{
s=1/i;
f=f+s;
i++;
}
for(k=1;k<=n;k++)
{
System.out.print("1/i"+k);
System.out.print(" ");
System.out.print(" + ");
System.out.print(" ");
}
System.out.print("-----------");
System.out.print("="+f);
}
}

Program for demo on Label and Image in Single code

This swing java program is used for displaying image, label in an applet.

Place a required picture in a folder, copy and paste the following code in a note pad and
save as "JLabelDemo.java" as the file name. Note that picture and java file must be stored
in the same folder.

compilation: javac JLabelDemo.java
run: appletviewer JLabelDemo.java

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

/* <applet code="JLabelDemo" width=355 height=200>
</applet>
*/

public class JLabelDemo extends JApplet{

public void init() {
// Get content pane
Container contentPane = getContentPane();

// Create an icon
ImageIcon ii = new ImageIcon("sateesh.jpg");

// Create a label
JLabel jl = new JLabel ("SATEESH.BAGADHI", ii, JLabel.CENTER);

// Add label to the content pane
contentPane.add(jl);
}
}

J applet for displaying a name

import java.awt.Graphics;
import java.awt.Font;
import java.awt.Color;

public class MoreHelloApplet extends java.applet.Applet {

Font f = new Font("TimesRoman",Font.BOLD,36);
String name;

public void init() {
this.name = getParameter("name");
if (this.name == null)
this.name = "Avul Kalam";

this.name = "Hello " + this.name + "!";
}

public void paint(Graphics g) {
g.setFont(f);
g.setColor(Color.red);
g.drawString(this.name, 5, 50);
}
}

Concept of Class Method and Object in JAVA

class Student{

    int no=10;    // data members

    void display(){ // method
        System.out.println("Hai!");
    }
}

class Main_Student{
public static void main(String args[]){

    Student s = new Student(); //object s for Student class

    System.out.println("Student number is:" +s.no);
    s.display();
    System.out.println("This is main class!");
    }
}

Java Program for Tabbed Pane in Java using applet

File name JTabbedPaneDemo.java

PROGRAM

import javax.swing.*;
/*
<applet code="JTabbedPaneDemo" width=400 height=100>
</applet>
*/
public class JTabbedPaneDemo extends JApplet {
public void init() {
JTabbedPane jtp = new JTabbedPane();
jtp.addTab("Cities", new CitiesPanel());
jtp.addTab("Colors", new ColorsPanel());
jtp.addTab("Flavors", new FlavorsPanel());
getContentPane().add(jtp);
}
}

class CitiesPanel extends JPanel {
public CitiesPanel() {
JButton b1 = new JButton("New York");
add(b1);
JButton b2 = new JButton("London");
add(b2);
JButton b3 = new JButton("Hong Kong");
add(b3);
JButton b4 = new JButton("Tokyo");
add(b4);
}
}

class ColorsPanel extends JPanel {
public ColorsPanel() {
JCheckBox cb1 = new JCheckBox("RED");
add(cb1);
JCheckBox cb2 = new JCheckBox("Green");
add(cb2);
JCheckBox cb3 = new JCheckBox("Blue");
add(cb3);
}
}

class FlavorsPanel extends JPanel {
public FlavorsPanel() {
JComboBox jcb = new JComboBox();
jcb.addItem("Vanilla");
jcb.addItem("Chocolate");
jcb.addItem("Strawberry");
add(jcb);
}
}

Compilation and Execution

Java program demo on tool tip

//Java Core Package
import javax.swing.*;
//Java Extension Package
import java.awt.*;

public class JavaApplication2 extends JFrame {

    //Initializing JButton
    private JButton button;

    //Setting up GUI
    public JavaApplication2() {

        //Setting up the Title of the Window
        super("Add ToolTipText on JButton");

        //Set Size of the Window (WIDTH, HEIGHT)
        setSize(250,100);

        //Exit Property of the Window
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Constructing JButton
        button = new JButton("Place The Cursor Here...");

        //Setting or Adding ToolTipText on JButton
        button.setToolTipText("My First ToolTipText on JButton");

        //Setting up the container ready for the components to be added.
        Container pane = getContentPane();
        setContentPane(pane);

        //Setting up the container layout
        FlowLayout flow = new FlowLayout(FlowLayout.CENTER);
        pane.setLayout(flow);

        //Adding the JButton component to the container
        pane.add(button);

        /**Set all the Components Visible.
        * If it is set to "false", the components in the container will not be visible.
        */
        setVisible(true);
    }

    //Main Method
    public static void main (String[] args) {
        JavaApplication2 ttt = new JavaApplication2();
    }
}

JAVA IO for displaying student details using fopen flcose

import java.io.*;

class Student{

public static void main(String args[]){

    InputStreamReader is = new InputStreamReader(System.in);
    BufferedReader br = new BufferedReader(is);

    System.out.print("Welcome to java");

    try{

        System.out.println("Enter Student Name:");

        String Name = br.readLine();

        System.out.println("Enter Student Number:");

        String No = br.readLine();

        System.out.println("Enter Student class:");

        String Clas = br.readLine();

    System.out.println(" Hi "+Name +" your no is: "+ No +", you are studying "+Clas +"!");
        }

    catch (IOException Err) {

    System.out.print("Error in reading Line!");
    }

    catch(NumberFormatException Err){
    System.out.print("Error in Number format conversion!");
    }
    }
}

Jdbc(Java Database Connectivity) Odbc(Open Database Conectiy) program using MS-Access database (4 Drivers)

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

class Myframe extends JFrame implements ActionListener
{
   JLabel lno,lname;
   JTextField tno,tname;
   JButton insert,view,update,search,nxt,pre,lst,frt,clr,dlt,exit;

   Connection cn;
   Statement st;
   ResultSet rs;
   Container conpane;
   Myframe()
   {

     lno=new JLabel("Eno");
     lname=new JLabel("Ename");

     tno=new JTextField(6);
     tname=new JTextField(15);

     insert=new JButton("Insert");
     view=new JButton("View");
     nxt=new JButton("Next");
     pre=new JButton("Previous");
     lst=new JButton("Last");
     frt=new JButton("First");
     clr=new JButton("Clear");
     dlt=new JButton("Delete");
     update=new JButton("Update");
     search=new JButton("Search");
     exit=new JButton("Exit");

    conpane = getContentPane();

    JPanel txtPanel,btnPanel;

    txtPanel = new JPanel();
    btnPanel = new JPanel();
     //setLayout(new GridLayout(2,2));
        conpane.add(txtPanel,BorderLayout.NORTH);
        conpane.add(btnPanel,BorderLayout.CENTER);
     txtPanel.add(lno);
     txtPanel.add(tno);

     txtPanel.add(lname);
     txtPanel.add(tname);

     btnPanel.add(insert);
     btnPanel.add(view);
     btnPanel.add(nxt);
     btnPanel.add(pre);
     btnPanel.add(lst);
     btnPanel.add(frt);
     btnPanel.add(clr);
     btnPanel.add(dlt);
     btnPanel.add(update);
     btnPanel.add(search);
     btnPanel.add(exit);

     insert.addActionListener(this);
     view.addActionListener(this);
     nxt.addActionListener(this);
     pre.addActionListener(this);
     lst.addActionListener(this);
     frt.addActionListener(this);
     clr.addActionListener(this);
     dlt.addActionListener(this);
     update.addActionListener(this);
     search.addActionListener(this);
     exit.addActionListener(this);

     try
                     {

                      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                      cn=DriverManager.getConnection("jdbc:odbc:employeedsn");
                      st=cn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
                     rs=st.executeQuery("select * from emp");
                     rs.next();

                }catch(Exception e){}
    }

    public void actionPerformed(ActionEvent a)

    {

    try
    {

        if(a.getSource()==search)
           {

            dbOpen();
            String str = JOptionPane.showInputDialog(null, "Enter empno : ");

            rs=st.executeQuery("select * from emp where eno="+str+"");

            rs.next();
            setText();
           }

        if(a.getSource()==update)
           {
             dbOpen();
            int ueno=Integer.parseInt(tno.getText());
            String uname=(tname.getText());
            st.executeUpdate("UPDATE emp SET eno=" + ueno +",ename='" + tname.getText() + "' WHERE eno="+ ueno +" ");
             JOptionPane.showMessageDialog(null,"Record is updated");
           }
         if(a.getSource()==dlt)
            {
               int deno=Integer.parseInt(tno.getText());

               st.executeUpdate("DELETE FROM emp WHERE eno="+ deno);
               JOptionPane.showMessageDialog(null,"Record is deleted");

            dbClose();
            dbOpen();

            }
        if(a.getSource()==clr)
           {
                 tno.setText("");
                 tname.setText("");
                 rs.first();
           }

         if(a.getSource()==frt)
        {
                  rs.first();
                  setText();
         }

         if(a.getSource()==lst)
          {
                 rs.last();
                  setText();
            }

         if(a.getSource()==nxt)
          {
             if(!rs.isAfterLast())
              {
                 rs.next();
                 setText();

            }

          else
            {
                 JOptionPane.showMessageDialog(null,"Last Record");
                rs.previous();
            }
           }
         if(a.getSource()==pre)
          {
            if(!rs.isBeforeFirst())
              {
                 rs.previous();
                 setText();
               }
           else
            {
                JOptionPane.showMessageDialog(null,"First Record");
                rs.first();
            }
          }
        if(a.getSource()==insert)
        {
          int eno=Integer.parseInt(tno.getText());
          String name=(tname.getText());
         st.executeUpdate("insert into emp values("+eno+",'"+name+"')");
         JOptionPane.showMessageDialog(null,"Record inserted into database");

         dbClose();
            dbOpen();
        }

       if(a.getSource()==view)
       {
            rs.next();
            setText();
            dbClose();
            dbOpen();
       }
       if(a.getSource()==exit)
                   {
                       if(JOptionPane.showConfirmDialog(null,"Are You Sure You Want to Exit?","Confirm",JOptionPane.YES_NO_OPTION)==JOptionPane.YES_OPTION)
                       System.exit(0);
                }
    }catch(Exception e)
      {
      }
}
public void dbOpen()
    {
        try
                {
                 Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                 cn=DriverManager.getConnection("jdbc:odbc:employeedsn");
                 st=cn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
                rs=st.executeQuery("select * from emp");
                rs.next();

                }catch(Exception e){}
    }

public void setText(){
        try{
            tno.setText(rs.getString(1));
            tname.setText(rs.getString(2));
            }catch(Exception ex){}
            }

            public void dbClose()
                {
                    try{
                        st.close();
                    rs.close();
                    cn.close();
                    }catch(Exception e){}
    }
}

class jdbcdemoframe
{
    public static void main(String s[])
    {
        Myframe f= new Myframe();
        f.setVisible(true);
        f.setTitle("Employee Information");
        f.setSize(350,250);
    }
}

DATA STRUCTURES

STACK Program using JAVA
STACK follows LIFO of FILO Last In First Out or First In Last Out
Operations PUSH(Add) POP (Delete)

import java.util.Scanner;

class Stack {

    int[] a;
    int top;

    public Stack(int n) {
        a = new int[n];
        top = -1;
    }

    public void push(int val) {
        if (top == a.length - 1) {
            System.out.println("Stack overflow...");
        } else {
            top++;
            a[top] = val;
        }
    }

    public void pop() {
        if (top == -1) {
            System.out.println("Stack underflow...");
        } else {
            System.out.println("Element popped" + a[top]);
            top--;
        }
    }

    public void display() {
        if (top == -1) {
            System.out.println("Stack empty...");
        } else {
            for (int i = top; i >= 0; i--) {
                System.out.println("Stack element: " + a[i]);
            }
        }
    }
}

public class UseStack {

    static public void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        Stack s;
        int n;
        System.out.println("Enter the size of the stack: ");
        n = sc.nextInt();
        s = new Stack(n);
        int choice;

        do {
            System.out.println("1.PUSH" + "\n" + "2.POP" + "\n" + "3.DISPLAY" + "\n" + "0.EXIT");
            System.out.println("Enter your choice");
            choice = sc.nextInt();

            switch (choice) {
                case 1:
                    int value;
                    System.out.println("Enter element to push");
                    value = sc.nextInt();
                    s.push(value);
                    break;

                case 2:
                    s.pop();
                    break;

                case 3:
                    s.display();

                case 0:
                    break;

                default:
                    System.out.println("invalid choice...");
            }
        } while (choice != 0);

    }
}

Program in JAVA for string Sorting

import java.lang.*;

class City
{
public static void main(String args[])
{

String name[] = {"visakhapatnam","hyderabad","kolkata","mumbai","chennai","delhi","ahamdabad","calcutta","bombay"};

int size=name.length;
String temp;
    System.out.println("The total number of the strings are:" + name.length);

    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]);
    }
    }
}

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