值传递和引用传递的区别

package com.cxy.juc;

public class Person {
    private String name;

    public Person(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

package com.cxy.juc;

public class TrabdDemo {

    public void changeValue(int age){
        age=30;
    }

    public void changeValue2(Person person){
        person.setName("1111111111");
    }

    public void changeValue3(String str){
        str ="xxxxxxxxxxxxx";
    }

    public static void main(String[] args) {
        TrabdDemo trabdDemo =new TrabdDemo();
        int age =20;
        trabdDemo.changeValue(age);
        System.out.println(age);

        Person ps =new Person("aaaa");
        trabdDemo.changeValue2(ps);
        System.out.println(ps.getName());

        String str ="abc";

        trabdDemo.changeValue3(str);

        System.out.println(str);

    }
}

com.cxy.juc.TrabdDemo
20
1111111111
abc

Process finished with exit code 0