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方法静态分派演示

/** * 方法静态分派演示 * Created by tiantao on 15-2-9. */public class StaticDispatch {    static abstract class Human {    }    static class Man extends Human {    }    static class Woman extends Human {    }    public void sayHello(Human guy) {        System.out.println("hello,guy!");    }    public void sayHello(Man guy) {        System.out.println("hello,gentleman!");    }    public void sayHello(Woman guy) {        System.out.println("hello,lady!");    }    public static void main(String[] args) {        Human man = new Man();        Human woman = new Woman();        StaticDispatch testJVM = new StaticDispatch();        testJVM.sayHello(man);        testJVM.sayHello(woman);    }}

hello,guy!

接下来是方法动态分派演示

/** * 方法动态分派演示 * Created by tiantao on 15-2-9. */public class DynamicDispatch {    static abstract class Human {        protected abstract void sayHello();    }    static class Man extends Human {        @Override        protected void sayHello() {            System.out.println("man say hello!");        }    }    static class Woman extends Human {        @Override        protected void sayHello() {            System.out.println("woman say hello!");        }    }    public static void main(String[] args) {        Human man = new Man();        Human woman = new Woman();        man.sayHello();        woman.sayHello();    }}

man say hello!

本来对方法重载和方法得重写概念挺清晰得，今天看了书里的这两个例子一下被带模糊了。

对第一个例子，静态分派的结果有点小意外。加强一下记忆。

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