source code to demonstrate covariant returntype in overriding

// sample application to show covariant return types
package oops;

class P
{
 public Object m1()
     {
     System.out.println("super");
     return new Object(); 
     }
}

public class OverridingCovariant extends P{

    public String m1()   
    //here m1 different return types valid in 1.5 version
    // but return types must parent to child relation.
        { 
        System.out.println("sub");
        return "sun"; 
        } 
    public static void main(String a[])
       {    
        OverridingCovariant s=new OverridingCovariant();
        s.m1();  // sub
       }
}