Java program to create user defined thread

class childthread implements Runnable
{
Thread t;
childthread()
{
t=new Thread(this,"hello");
System.out.println("child created");
t.start();
}
public void run()
{
try
{
for(int i=0;i<10;i++)
 {
 System.out.println("child "+i);
 Thread.sleep(500);
 }
}
catch(InterruptedException e)
{}
}
}
class parentthread
{
public static void main(String[] s)
{
 childthread c= new childthread();
try
{
 for(int i=0;i<10;i++)
  {
   System.out.println("main "+i);
   Thread.sleep(1000);
  }
}
catch(InterruptedException e)
{}
}
}

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Using of interface in java program

interface x
{
public void area();
}

class y implements x
{
int a,b;
           public void area()
{
a=5;b=7;
System.out.println("Area is "+a*b);c
}
}

 class z implements x
{
int a;
public void area()
{
a=5;
System.out.println("Area of box is "+a*a);
}
}

class inter
{
public static void main(String[] args)
{
y a=new y();
z s=new z();
a.area();
s.area();
}
}

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