JAVA 是值传递，栈内值的传递
堆只是存储空间，栈代表线程执行过程，JAVA 方法参数传递只与栈有关
认真看下下方代码，就懂了
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public class Test {
public void fun01() {
User user01 = new User();
user01.username = "张三";
fun02(user01);
System.out.println(user01);
User user02 = new User();
user02.username = "张三";
fun03(user02);
System.out.println(user02);
}
public void fun02(User user) {
user.username = "王五";
}
public void fun03(User user) {
User temp = new User();
temp.username = "王五";
user = temp;
}
public static void main(String[] args) {
Test test = new Test();
test.fun01();
}
class User {
String username;
@Override
public String toString() {
return "username=" + username;
}
}
}