本文共 1378 字，大约阅读时间需要 4 分钟。

??????Java??????????????????????????????????????????????????????????????????????????????????

????????????????????clinit()???????????????????static {}????????????????????????????????????????????????????

????????????????????????????

????????????????????????????????????????????????

???????????????????????????????????????

public class Test4 {    public void run(Animal animal) {}    public void run(Dog dog) {}    public void run(Lion lion) {}        public static void main(String[] args) {        Animal dog = new Dog();        Animal lion = new Lion();        dog.run(); // ??Animal?run??        lion.run(); // ??Lion?run??    }}

???????????????????????????????????

???????????????????????????????????????????

public abstract class Animal {    public abstract void run();}class Dog extends Animal {    @Override    public void run() {}}class Lion extends Animal {    @Override    public void run() {}}class Test4 {    public static void main(String[] args) {        Animal dog = new Dog();        Animal lion = new Lion();        dog.run(); // ??Dog?run??        lion.run(); // ??Lion?run??    }}

??????????run()??????????????????????????????

转载地址：http://mlik.baihongyu.com/