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；