Vtable and dynamic dispatching mechanism

1. Create MyTest7

com.example.jvm.bytecode Package; 

Import java.util.Date; 

public MyTest7 class { 

    public static void main (String [] args) { 
        Animal Animal Animal new new = (); 
        Animal Dog Dog new new = (); 
        animal.test ( "Hello"); 
        dog.test (new new a Date ()); 

    } 
} 

// overload existing methods, there are a subclass of Dog method of rewriting 
class Animal { 

    public void Test (String STR) { 
        the System. Out.println ( "Animal Test"); 
    } 

    public void Test (a Date DATE) { 
        System.out.println ( "Animal DATE"); 
    } 
} 

class Dog the extends Animal { 

    @Override  
    public void Test (String STR) {
        System.out.println ( "Test Dog" ); 
    }

    @Override
    public void test(Date date) {
        System.out.println("dog date");
    }

}

　　Output:

animal test
dog date