[Java Snippet003]_Polymorphism_001

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class A {

    public int getNumber(int a) {
        return a + 1;
    }

}

class B extends A {

    public int getNumber(int a) {
        return a + 100;
    }

}

public class Bettle {

    public static void main(String[] args) {
        A a = new A();
        System.out.println(a.getNumber(10)); // 11

        a = new B();
        System.out.println(a.getNumber(10)); // 110
    }

}