java面向对象-this

this的必要性

public class demo //可执行文件

{

public static void main(String [] args)

{

Dog dog1 = new dog;

Person p1 = new Person(23,”郭德纲”);

Person p1 = new Person(22,”刘德华”);

p1.showInfo();

}

}

class Person

{

int age;

Dog dog;//引用类型

String name;

public Person(int age ,String name)

{

this.age =age;

this.name = name;

this.dog = dog;

}

public void showInfo()

{

System.out.println(“人名是:”+this.name);

}

}

class Dog

{

int age;

String name;

public Dog(int age,String name)

{

this.name = name;

this.age = age;

}

public void showInfo()

{

System.out.println(“人名是:”+this.name);

}

}

class Child

{

int age;

String name;

public Child(int age,String name)

{

this.age = age;

this.name = name;

}

public void joinGame()

{

}

}

this就像是在日常中“我的”，实例化一个对象后，this是属于一个对象，而不是一个类；

this 不能在类的外部使用；

在类定义中用的；

区分不同类的成员变量；