class People {
public int age;
People(int age) {this.age = age;}
}
public class TestPeople {
static void change1(People p) {
System.out.println("(1)" + p + " age: " + p.age);
People newP = new People(p.age); //这里是改变地址吗?但是output里面的“People”又是什么???
p = newP;
System.out.println("(2)" + p +" age: " + p.age);
}
static void change2(People p) {
System.out.println("(3)" + p + " age: " + p.age);
p.age += 10;
System.out.println("(4)" + p + " age: " + p.age);
}
public static void main(String[] args) {
People p = new People(25);
change2(p);
change1(p);
}
}
![img](https://img-mid.csdnimg.cn/release/static/image/mid/ask/703496154256118.png?x-oss-process=image/auto-orient,1/resize,w_320,m_lfit)