Kumaran1987

Program public class upcasting {    public static void main(String[] args)     {      car c,cc,ccc,o;      o=new car();      o.car(); //no casting      c=(car)new ford(); //upcasting ford sub class to super class      c.car();      cc=(car)new benz();//upcasting ford sub class to super class      cc.car();      ccc=(car)new BMW();//upcasting ford sub class to super class            ccc.car();         } } class car {     void car()     {         System.out.println("This super class car method");     } } class ford extends car {     @Override     void car()     {         System.out.println("This sub class Ford car method");     } } class benz extends car { ...

Program class inheritance {  public static void main(String[] args)  {   apple a=new apple();   a.disp();  } } class fruit {  String f="fruit";  public void disp()  {   System.out.println("Base Class "+f);  } } class apple extends fruit {  String f="Apple";  public void disp()  {   System.out.println("Derived Class  "+f);   super.disp();   System.out.println("Super Class "+super.f);  } } Output

Program import java.io.*; public class createfile {     public static void main(String[] args)     {         try         {         createfile();         }         catch(Exception ex)         {             System.out.println("File Exceptio occured");         }         }     public static void createfile() throws java.io.IOException     {         DataInputStream d=new DataInputStream(System.in);         FileOutputStream f=new FileOutputStream("jack.txt",true);         BufferedOutputStream b=new BufferedOutputStream(f,1024);         System.out.println("Enter $ at the end to finish text");         char c;         while((c=(c...

Program import java.awt.*; import java.awt.event.*; public class awtexample extends Frame{     public static void main(String[] args)     {         Frame f= new Frame("New Frame");         f.setSize(400, 500);         f.setVisible(true);         f.addWindowListener(new WindowAdapter(){         public void windowClosing(WindowEvent e)         {         System.exit(0);         }      });     } } Output

Program i mport java.util.logging.Level; import java.util.logging.Logger; class ThreadRunnnable {     public static void main(String[] args)     {                new ThreadRun();        new ThreadRunn();        System.out.println("Main Thread Starts");         for(int i=1;i<=5;i++)         {             System.out.println(i);             try {                 Thread.sleep(1500);             } catch (InterruptedException ex) {                 Logger.getLogger(ThreadRun.class.getName()).log(Level.SEVERE, null, ex);             }         }                     ...