INNOVATIVE TUTORIALS

JAVA PROGRAM TO CHECK STRING PALINDROME

on: 
 
Software: Windows 8,

Jdk 1.6,   Netbeans IDE 
 
Hardware: Intel Core

i3, 4 GB RAM, 500 GB HDD</div>
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@Author: Praveen

Kanwar 
import java.util.*; public class StringPalindrome {     public static void main(String[] args)     {         Scanner sn=new Scanner(System.in);         System.out.println("Enter any string: ");         String str=sn.next();         StringBuffer sb = new StringBuffer(str);             sb.reverse();             if(str.equals(sb.toString()))             System.out.println("The given string "+str+" is a palindrome");         else             System.out.println("The given string "+str+" is not a palindrome");     } }</div>
 
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 Enter any string: 
madam 
The given string madam is a palindrome 
 
 Enter any string: 
cat 
The given string cat is not a palindrome</div>
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JAVA PROGRAM TO CHECK STRING PALINDROME

Program Statement: Write a JAVA program to check given string is palindrome or not. Tested on: Software: Windows 8, Jdk 1....

JAVA PROGRAM TO DEMONSTRATE RUNTIME POLYMORPHISM

on: 
 
Software: Windows 8,

Kanwar 
abstract class Shape {     abstract void area(); } class Rectangle extends Shape {     @Override     void area()     {     int l=10,b=20;     System.out.println("The area of rectangle is:"+l*b);     } } class Square extends Shape {     void area()     {         int l=10;         System.out.println("The area of square is:"+l*l);     } } public class RuntimePolymorphism {     /**      * @param args the command line arguments      */     public static void main(String[] args) {         // TODO code application logic here     Shape s;     Rectangle r=new Rectangle();     Square s1=new Square();     s=r;     s.area();     s=s1;     s.area();         }     }</div>
 
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Output
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The area of rectangle is:200 
The area of square is:100</div>
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JAVA PROGRAM TO DEMONSTRATE RUNTIME POLYMORPHISM

Program Statement: Write a JAVA program to demonstrate runtime polymorphism. Tested on: Software: Windows 8, Jdk 1.6, N...

JAVA PROGRAM TO DEMONSTRATE SIMPLE JAVA APPLET

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Program Statement: Develop an applet that displays a simple message.</div>
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Tested

on: 
 
Software: Windows 8,

Code</div>
 
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@Author: Praveen

Kanwar 
import java.applet.*; import java.awt.*; /*<applet code="SimpleApplet" width=500 height=500> </applet> */ public class SimpleApplet extends Applet { public void init() {     setForeground(Color.RED);     setBackground(Color.BLUE); }     public void paint(Graphics g) {     Font f=new Font("Arial",Font.ITALIC,20);     g.setFont(f);     g.drawString("Welcome to Applet Programming!",50,50); }     }</div>
 
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JAVA PROGRAM TO DEMONSTRATE SIMPLE JAVA APPLET

Program Statement: Develop an applet that displays a simple message. Tested on: Software: Windows 8, Jdk 1.6, Netbeans...

JAVA APPLET PROGRAM TO SIMULATE TRAFFIC LIGHTS

on: 
 
Software: Windows 8,

Kanwar 
import java.applet.*; import java.awt.*; import java.awt.event.*; /* <applet code="TrafficLights" width=500 height=500> </applet> */ public class TrafficLights extends Applet implements ItemListener {     CheckboxGroup cbg;     Checkbox r,g1,y;     public void init()     {         cbg=new CheckboxGroup();         r=new Checkbox("Red",cbg,false);         g1=new Checkbox("Green",cbg,false);         y=new Checkbox("Yellow",cbg,false);         r.addItemListener(this);         g1.addItemListener(this);         y.addItemListener(this);         add(r);         add(g1);         add(y);     }     public void itemStateChanged(ItemEvent ie)     {         repaint();     }     public void paint(Graphics g)     {         if(cbg.getSelectedCheckbox()==r)         {             g.setColor(Color.red);             g.fillOval(150, 125,70,70);         }         if(cbg.getSelectedCheckbox()==g1)         {             g.setColor(Color.green);             g.fillOval(150, 125,70,70);         }         if(cbg.getSelectedCheckbox()==y)         {             g.setColor(Color.yellow);             g.fillOval(150, 125,70,70);         }     } }</div>
 
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JAVA APPLET PROGRAM TO SIMULATE TRAFFIC LIGHTS

Program Statement: Write a JAVA program that simulates a traffic light. The program lets the user select one of the three lights: red, ye...

JAVA APPLET PROGRAM FOR HANDLING MOUSE EVENTS

on: 
 
Software: Windows 8,

Kanwar 
import java.applet.*; import java.awt.event.*; import java.awt.*; public class MouseHandling extends Applet implements MouseListener, MouseMotionListener {     String msg=""; public void init() {     addMouseListener(this);     addMouseListener(this);     } public void mouseEntered(MouseEvent me) {     setBackground(Color.RED);     msg="Mouse Entered";     showStatus("Mouse Entered at:"+me.getX()+","+me.getY());     repaint(); } public void mouseExited(MouseEvent me) {     setBackground(Color.WHITE);     msg="Mouse Exited";     showStatus("Mouse Exited"+me.getX()+","+me.getY());     repaint(); } public void mouseDragged(MouseEvent me) {  setBackground(Color.RED);     msg="Mouse Dragged";     showStatus("Mouse Dragged at:"+me.getX()+","+me.getY());     repaint();   } public void mousePressed(MouseEvent me) {    } public void mouseReleased(MouseEvent me) {     } public void mouseClicked(MouseEvent me) {  setBackground(Color.RED);     msg="Mouse Clicked";     showStatus("Mouse Clicked at:"+me.getX()+","+me.getY());     repaint();     } public void mouseMoved(MouseEvent me) {     setBackground(Color.RED);     msg="Mouse moved";     showStatus("Mouse Moved at:"+me.getX()+","+me.getY());     repaint();  } public void paint(Graphics g) {     g.drawString(msg,30,30); }    }</div>
 
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JAVA APPLET PROGRAM FOR HANDLING MOUSE EVENTS

Program Statement: Write a JAVA applet program for handling Mouse Events. Tested on: Software: Windows 8, Jdk 1.6, Netbe...

JAVA PROGAM TO COMPUTE nxn MATRIX MULTIPLICATION

on: 
 
Software: Windows 8,

Kanwar 
import java.util.*; class Multiplication {     int[][] mul(int x[][],int y[][],int z[][],int m,int n,int p,int q)     {         for(int r=0;r<m;r++)         {        for(int c=0;c<n;c++)             {         z[r][c]=0;         for(int k=0;k<p;k++)             z[r][c]=z[r][c]+x[r][k]*y[k][c];                     }         }      return z;     } } class Matrixmul {     public static void main(String[] args)     {         System.out.println("\n Enter the number or rows and columns in matrix A:\n");         Scanner sn=new Scanner(System.in);         int m=sn.nextInt();         int n=sn.nextInt();         int result[][]=new int[m][n];         int A[][]=new int[m][n];         System.out.println("Enter elements into matrix A:\n");         for(int r=0;r<m;r++)         for(int c=0;c<n;c++)         A[r][c]=sn.nextInt();         System.out.println("Enter the number or rows and columns in matrix B:\n");         int p=sn.nextInt();         int q=sn.nextInt();         int B[][]=new int[p][q];         System.out.println(" Enter elements into matrix B:\n");         for(int r=0;r<p;r++)         for(int c=0;c<q;c++)         B[r][c]=sn.nextInt();         Multiplication obj=new Multiplication();         if(n==p)         {         obj.mul(A,B,result,m,n,p,q);         for(int r=0;r<m;r++)             {         for(int c=0;c<n;c++)                 {             System.out.print(result[r][c] +"\t");                 }                 System.out.print("\n");             }         }             else         System.out.println(" Matrix Multiplication Not Possible.");             } }</div>
 
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 Enter the number or rows and columns in matrix A: 3 3 Enter elements into matrix A: 1 2 3 4 5 6 7 8 9 Enter the number or rows and columns in matrix B: 3 3  Enter elements into matrix B: 1 2 3 6 7 8 4 5 6</div>
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 25    31    37   58    73    88   91    115    139    </div>
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JAVA PROGAM TO COMPUTE nxn MATRIX MULTIPLICATION

Program Statement: Write a JAVA program to compute Matrix Multiplication. Tested on: Software: Windows 8, Jdk 1.6, Net...

JAVA APPLET PROGRAM TO HANDLE DIVIDE BY ZERO EXCEPTION

Jdk 1.6,   Netbeans IDE 
 
Hardware: Intel Core

i3, 4 GB RAM, 500 GB HDD</div>
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Source

Kanwar 
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import java.applet.*; import java.awt.*; import java.awt.event.*; /* <applet code="DivideDemo" width=500 height=500> </applet? */ public class DivideDemo extends Applet implements ActionListener,TextListener { Label l1,l2,l3; TextField t1,t2,t3; Button b1; int x,y; float res=0; public void init() {     l1=new Label("Num1:");     l2=new Label("Num2:");     l3=new Label("Num3:");     t1=new TextField(10);     t2=new TextField(10);     t3=new TextField(10);     b1=new Button("Display");     add(l1);     add(t1);     add(l2);     add(t2);     add(b1);     add(l3);     add(t3);     b1.addActionListener(this);     t1.addTextListener(this);     t2.addTextListener(this); }    public void actionPerformed(ActionEvent ae)    {        try        {            int x=Integer.parseInt(t1.getText());            int y=Integer.parseInt(t2.getText());            if(ae.getSource()==b1)              res=x/y;        }        catch(NumberFormatException nfe)        {            javax.swing.JOptionPane.showMessageDialog(this, "Please enter Integer value");        }        catch(ArithmeticException afe)        {            javax.swing.JOptionPane.showMessageDialog(this,"Please enter non-zero value");        }        t3.setText(String.valueOf(res));    }    public void textValueChanged(TextEvent te)    {        if(!t1.getText().equals("")&&(!t2.getText().equals("")))        {            b1.setEnabled(true);                   }        else            b1.setEnabled(false);               } }</div>
 
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JAVA APPLET PROGRAM TO HANDLE DIVIDE BY ZERO EXCEPTION

Program Statement: Write a program that creates a user interface to perform integer divisions. The user enters two numbers in the text f...

JAVA APPLET PROGRAM TO CALCULATE FACTORIAL

on: 
 
Software: Windows 8,

Kanwar 
import java.applet.*; import java.awt.event.*; import java.awt.*; /*<applet code="Factorial" width=500 height=500> </applet> */ public class FactorialApplet extends Applet implements ActionListener {   Label l1,l2;   TextField t1,t2;   Button b1,b2;   public void init()   {       l1=new Label("Enter a value: ");       l2=new Label("Result:");       t1=new TextField(10);       t2=new TextField(10);       b1=new Button("Calculate");       b2=new Button("Clear");       add(l1);       add(t1);       add(b1);       add(b2);       add(l2);       add(t2);       b1.addActionListener(this);       b2.addActionListener(this);   }   public void actionPerformed(ActionEvent ae)   {       int n=Integer.parseInt(t1.getText());       int fact=1;       if(ae.getSource()==b1)       {           if(n==0||n==1)           {               fact=1;           t2.setText(String.valueOf(fact));           }           else           {           for(int i=1;i<=n;i++)               fact=fact*i;           }      t2.setText(String.valueOf(fact));       }       else if(ae.getSource()==b2)       {           t1.setText("");           t2.setText("");       }         } 
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JAVA APPLET PROGRAM TO CALCULATE FACTORIAL

Program Statement: Develop an applet that receives an integer in one text field, and computes its factorial value and returns it in anoth...

JAVA PROGRAM TO FIND ROOTS OF A QUADRATIC EQUATION

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Program Statement: Write a JAVA program to find roots of a Quadratic Equation. If Discriminant is negative, display a message stating that there are no real solutions. </div>
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Tested on: 
 
Software: Windows 8, Jdk 1.6,   Netbeans IDE 
 
Hardware: Intel Core i3, 4 GB RAM, 500 GB HDD</div>
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Source Code</div>
 
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@Author: Praveen Kanwar 
import java.util.*; class QuadraticRoots {    public static void main(String[] args)     {         int a,b,c,d;         Scanner sn=new Scanner(System.in);         System.out.println("Enter a,b,c values: ");         a=sn.nextInt();         b=sn.nextInt();         c=sn.nextInt();         d=b*b-4*a*c;         if(d>0)         {             System.out.println("Roots are real and distinct");             System.out.println("Roots are:");             double r1=((-b)+Math.sqrt(d))/(2*a);             double r2=((-b)-Math.sqrt(d))/(2*a);             System.out.println("r1= "+r1);             System.out.println("r2= "+r2);                                 }         else if(d==0)         {              System.out.println("Roots are real and equal");             System.out.println("Roots are:");             double r1=(-b)/(2*a);             double r2=(-b)/(2*a);             System.out.println("r1= "+r1);             System.out.println("r2= "+r2);         }         else             System.err.println("Roots are imaginary!");     } }</div>
 
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Output
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CASE 1: 
Enter a,b,c values: 
1 2 3 
Roots are imaginary! 
CASE 2: 
Enter a,b,c values: 
1 5 6 
Roots are real and distinct 
Roots are: 
r1= -2.0 
r2= -3.0</div>
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JAVA PROGRAM TO FIND ROOTS OF A QUADRATIC EQUATION

Program Statement: Write a JAVA program to find roots of a Quadratic Equation. If Discriminant is negative, display a message stating tha...