学生，电脑

package com.javasm.bean;
//创建Student类
public class Student {
    //学号
    public int stuId;
    //姓名
    public String stuName;
    //性别
    public String stuSex;
    //年龄
    public int stuAge;
    //班级
    public String stuClass;
    //一台电脑
    public Computer computer;

    /**
     * 无参构造
     */
    public Student() {
        this(1000, "测试学生", "测试性别", 0, "测试班级");
        System.out.println("调用无参构造，学生进行了初始化操作！");
    }

    /**
     * 有参构造
     *
     * @param stuId
     * @param stuName
     * @param stuSex
     * @param stuAge
     * @param stuClass
     */
    public Student(int stuId, String stuName, String stuSex, int stuAge, String stuClass) {
        System.out.println("调用有参构造！");
        this.stuId = stuId;
        this.stuName = stuName;
        this.stuSex = stuSex;
        this.stuAge = stuAge;
        this.stuClass = stuClass;
    }

    /**
     * 显示
     */
    public void show() {
        System.out.println("学号：" + this.stuId);
        System.out.println("姓名：" + this.stuName);
        System.out.println("性别：" + this.stuSex);
        System.out.println("年龄：" + this.stuAge);
        System.out.println("班级：" + this.stuClass);
    }

    /**
     * 读书
     */
    public void read() {
        System.out.println("学生具备读书的行为！");
    }

    /**
     * 写
     */
    public void writer() {
        System.out.println("学生具备写作的行为！");
    }
}

StudentTest：创建对象

package com.javasm.test;

import com.javasm.bean.Computer;
import com.javasm.bean.Student;

public class StudentTest {
    public static void main(String[] args) {
        //准备一台电脑
        Computer computer = new Computer(1, "荣耀", 15, "intel i3");
        System.out.println("computer-->" + computer);
        Computer computer1 = computer.getComputer();
        System.out.println("computer1-->" + computer1);


        //创建对象： 类名 对象名 = new 类名();    //赋值：对象名.属性名 = 值;
        Student student1 = new Student(1001, "小白", "女", 30, "Java1班");
        //配备一台电脑
        student1.computer = computer;

        //取值：通过对象名来操作
        System.out.println("student1-->" + student1);
        student1.show();
        System.out.println("电脑的基本信息：");
        System.out.println("电脑编号：" + student1.computer.computerId);
        System.out.println("电脑品牌：" + student1.computer.brand);
        System.out.println("电脑尺寸：" + student1.computer.size);
        System.out.println("电脑CPU：" + student1.computer.cpu);

        //行为
        student1.read();
        student1.writer();
        System.out.println("------------------------------------------------------------------------");

        //第二个学生
        Student student2 = new Student(1002, "小黑", "男", 20, "Java2班");
        //取值：通过对象名来操作
        System.out.println("student2-->" + student2);
        student2.show();

        Student student3 = new Student();
        student3.show();
    }
}

computer类

package com.javasm.bean;

public class Computer {
    //编号
    public int computerId;
    //品牌
    public String brand;
    //尺寸大小
    public int size;
    //cpu
    public String cpu;

    /**
     * 无参构造
     */
    public Computer() {

    }

    /**
     * 有参构造
     *
     * @param computerId
     * @param brand
     * @param size
     * @param cpu
     */
    public Computer(int computerId, String brand, int size, String cpu) {
        this.computerId = computerId;
        this.brand = brand;
        this.size = size;
        this.cpu = cpu;
    }

    /**
     * 上网
     */
    public void internet() {
        System.out.println("电脑具备上网的行为!");
    }

    /**
     * 将当前对象直接返回
     *
     * @return
     */
    public Computer getComputer() {
        return this;
    }
}

computerTest

package com.javasm.test;

import com.javasm.bean.Computer;

/**
 * @Author：Zxb
 * @Version：1.0
 * @Date：2022/11/17-11:46
 * @Since：jdk1.8
 * @Description：
 */
public class ComputerTest {
    public static void main(String[] args) {
        Computer computer0 = new Computer(1,"荣耀",15,"intel i3");
//
//        computer.productId=1001;
//        computer.brand="华为荣耀";
//        computer.size=15;
//        computer.cpu="inter i7";
        computer0.show();
//        System.out.println("编号：" + computer.productId);
//        System.out.println("品牌：" + computer.brand);
//        System.out.println("尺寸：" + computer.size);
//        System.out.println("cpu：" + computer.cpu);

        computer0.internet();
    }
}