JavaTIL.java

class SuperClass {
	public void foo() {
		System.out.println("SuperClass FOO");
	}
}

class SubClass extends SuperClass {
	@Override
	public void foo() {
		System.out.println("SubClass foo");
	}
}

public class JavaTIL {
	public static void main(String[] args) {
		SuperClass obj = new SubClass();
		obj.foo();
	}

}