class A{}
class B extends A{}
 
class SomeThing{
 
void meth1( A a ){
System.out.println("Inside A");
}
void meth1( B b ){
System.out.println("Inside B");
}
 
public static void main( String []args ){
SomeThing t = new SomeThing();
t.meth1( null );
}
}