002_java8新增的接口特性default关键字

一、

package com.arun;

public class Java8Tester {
    public static void main(String args[]){
        Vehicle vehicle = new Car();
        vehicle.print();
    }
}

interface Vehicle {
    default void print(){
        System.out.println("我是一辆车!");
    }

    static void blowHorn(){
        System.out.println("按喇叭!!!");
    }
}

interface FourWheeler {
    default void print(){
        System.out.println("我是一辆四轮车!");
    }
}

class Car implements Vehicle, FourWheeler {
    public void print(){
        Vehicle.super.print();
        FourWheeler.super.print();
        Vehicle.blowHorn();
        System.out.println("我是一辆汽车!");
    }
}

执行结果:

$ javac Java8Tester.java 
$ java Java8Tester
我是一辆车!
我是一辆四轮车!
按喇叭!!!
我是一辆汽车!