/**

* This demonstrates how Java polymorphism is limited to the compile time type.

*/

public class CompileTimeResolution {

public static void main(String[] args) {

SomethingA a = new SomethingA();

SomethingA b = new SomethingB();

SomethingA c = new SomethingC();

sayHello(a);

sayHello(b);

// Explicitly casting to the runtime type of the object makes no difference

sayHello(c.getClass().cast(c));

}

private static void sayHello(SomethingA a) {

System.out.println("Hello A");

}

// Never called

private static void sayHello(SomethingB b) {

System.out.println("Hello B");

}

// Never called

private static void sayHello(SomethingC c) {

System.out.println("Hello C");

}

static class SomethingA {

}

static class SomethingB extends SomethingA {

}

static class SomethingC extends SomethingB {

}

}