Java多态性例子解释🔚

[java]
package com.jasonote.classStudy;

/**
* Created by Jasonote on 2018/1/18.
*
* 类的多态性列子总结
* 看当前引用类型是谁,调用当前类的方法,如果找不到向下找
* a,指向子类的父类引用由于向上转型了,它只能访问父类中拥有的方法和属性,而对于子类中存在而父类中不存在的方法,该引用是不能使用的,尽管是重载该方法。
* b,若子类重写了父类中的某些方法,在调用该些方法的时候,必定是使用子类中定义的这些方法(动态连接、动态调用)
* c,在继承链中对象方法的调用存在一个优先级:this.show(O)、super.show(O)、this.show((super)O)、super.show((super)O)。即先查this对象的父类,没有就重头再查参数的父类
*/
public class PolymorphicClassDemo {

public static void main(String[] args) {
Father father = new Father();
Father father2 = new Son01();
Son01 son01 = new Son01();
Son0101 son0101 = new Son0101();
Son0102 son0102 = new Son0102();

//Father And Father
System.out.println("father.show(father2) -> " + father.show(father2));

//Father And Father
System.out.println("father.show(son0101) -> " + father.show(son0101));

//Father And Son0102
System.out.println("father.show(son0102) -> " + father.show(son0102));

//Son01 And Father
System.out.println("father2.show(son01) -> " + father2.show(son01));

//Son01 And Father
System.out.println("father2.show(son0101) -> " + father2.show(son0101));

//Father And Son0102
System.out.println("father2.show(son0102) -> " + father2.show(son0102));

//Son01 And Father
System.out.println("son01.show(father) -> " + son01.show(father));

//Son01 And Father
System.out.println("son01.show(son0101) -> " + son01.show(son0101));

//Father And Son0102
System.out.println("son01.show(son0102) -> " + son01.show(son0102));

//Son01 And Son01
System.out.println("son01.show(son0102) -> " + son0101.show(son0101));

}

}

class Father {
public String show(Son0102 son0102) {
return ("Father And Son0102");
}

public String show(Father father) {
return ("Father And Father");
}

}

class Son01 extends Father {
public String show(Son01 son01) {
return ("Son01 And Son01");
}

public String show(Father father) {
return ("Son01 And Father");
}
}

class Son0101 extends Son01 {

}

class Son0102 extends Son01 {

}
[/java]

Jason.wang

When you find your talent can't afford to be ambitious, be quiet and study !

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