java编写一个类，里面包含学号，学生姓名两个属性，再编写一个静态函数，可交换两人信息。

Question

java编写一个类，里面包含学号，学生姓名两个属性，再编写一个静态函数，可交换两人信息。

Answer 1

封装类呢？多少个属性都能交换。

package org.example;

public class Student {
    public String name;
    public String no;

    public static void swap(StudentWrapper s1, StudentWrapper s2){
        Student temp = s1.student;
        s1.student = s2.student;
        s2.student = temp;
    }

    public static void main(String[] args) {
        Student s1 = new Student();
        Student s2 = new Student();
        s1.setName("张三");
        s1.setNo("1");
        s2.setName("李四");
        s2.setNo("2");
        StudentWrapper sw1 = new StudentWrapper(s1);
        StudentWrapper sw2 = new StudentWrapper(s2);
        System.out.println("======转换前======");
        System.out.println("s1.getName() = " + sw1.student.getName());
        System.out.println("s1.getNo() = " + sw1.student.getNo());
        System.out.println("s2.getName() = " + sw2.student.getName());
        System.out.println("s2.getNo() = " + sw2.student.getNo());
        Student.swap(sw1,sw2);
        System.out.println("======转换后======");
        System.out.println("s1.getName() = " + sw1.student.getName());
        System.out.println("s1.getNo() = " + sw1.student.getNo());
        System.out.println("s2.getName() = " + sw2.student.getName());
        System.out.println("s2.getNo() = " + sw2.student.getNo());
    }

    public String getName() {
        return name;
    }

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

    public String getNo() {
        return no;
    }

    public void setNo(String no) {
        this.no = no;
    }

    static class StudentWrapper{
        Student student;
        StudentWrapper(Student student){
            this.student = student;
        }
    }
}

输出结果：

======转换前======
s1.getName() = 张三
s1.getNo() = 1
s2.getName() = 李四
s2.getNo() = 2
======转换后======
s1.getName() = 李四
s1.getNo() = 2
s2.getName() = 张三
s2.getNo() = 1