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class Superclass
{
static void display()
{
System.out.println("hello superclass");	
}
}
public class Subclass extends Superclass {
	static void display()
	{
	System.out.println("hello superclass");	
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
Superclass s=new Superclass();
s.display();
Subclass sub= new Subclass();
sub.display();
s=sub;
s.display();
sub=s;
sub.display();
 
	}
 
}
 

Main.java:8: error: class Subclass is public, should be declared in a file named Subclass.java
public class Subclass extends Superclass {
       ^
Main.java:24: error: incompatible types: Superclass cannot be converted to Subclass
sub=s;
    ^
2 errors

Standard output is empty