Java实例---简单的上课管理系统

源码分析

Course.java

package com.ftl.many2many;

import java.util.*;

public class Course
{
    private int credit;
    private String name;
    private List<Student> allStudent;
    public int getCredit()
    {
        return credit;
    }
    public void setCredit(int credit)
    {
        this.credit = credit;
    }
    public String getName()
    {
        return name;
    }
    public void setName(String name)
    {
        this.name = name;
    }
    public List<Student> getAllStudent()
    {
        return allStudent;
    }
    public void setAllStudent(List<Student> allStudent)
    {
        this.allStudent = allStudent;
    }
    public Course()
    {
        this.allStudent = new ArrayList<Student>();
    }
    public Course(String name, int credit)
    {
        this();
        this.setCredit(credit);
        this.setName(name);
    }
    
    public String toString()
    {
        return "课程名称：" + this.name + "\t课程学分：" + this.credit;
    }
}

School.java

package com.ftl.many2many;

import java.io.*;
import java.util.*;
public class School
{
    private String name;
    private List<Student> allStudent;
    public School()
    {
        this.allStudent = new ArrayList<Student>();
    }
    public School(String name)
    {
        this();
        this.name = name;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public List<Student> getAllStudent() {
        return allStudent;
    }
    public void setAllStudent(List<Student> allStudent) {
        this.allStudent = allStudent;
    }
    public String toString()
    {
        return "学校姓名" + this.name;
    }
    
    
    
}

Student.java

package com.ftl.many2many;

import java.util.*;
public class Student 
{
    private int age;
    private String name;
    private School school;
    private List<Course> allCourse;
    
    public Student()
    {
        this.allCourse = new ArrayList<Course>();
    }
    public Student(String name, int age)
    {
        this();
        this.setName(name);
        this.setAge(age);
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public School getSchool() {
        return school;
    }
    public void setSchool(School school) {
        this.school = school;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public List<Course> getAllCourse() {
        return allCourse;
    }
    public void setAllCourse(List<Course> allCourse) {
        this.allCourse = allCourse;
    }
    public String toString()
    {
        return "学生姓名：" + this.name + "\t 年龄：" + this.age;
    }
}

testDemo.java

package com.ftl.many2many;

import java.util.Iterator;

public class testDemo
{
    public static void main(String[] args)
    {
        School sch = new School("海风大学");
        Student s1 = new Student("张三", 12);
        Student s2 = new Student("赵四", 22);
        Student s3 = new Student("张5", 11);
        Course c1 = new Course("计算机", 3);
        Course c2 = new Course("语文", 1);
        Course c3 = new Course("数学", 2);
        //3个学生一个学校
        s1.setSchool(sch);
        s2.setSchool(sch);
        s3.setSchool(sch);
        //一个学校3个学生
        sch.getAllStudent().add(s1);
        sch.getAllStudent().add(s2);
        sch.getAllStudent().add(s3);
        //第一门课3个xues
        c1.getAllStudent().add(s3);
        c1.getAllStudent().add(s2);
        c1.getAllStudent().add(s1);
        s2.getAllCourse().add(c2);
        s1.getAllCourse().add(c1);
        s3.getAllCourse().add(c3);
        
        //第二门一个学生
        c2.getAllStudent().add(s3);
        s3.getAllCourse().add(c2);
        c3.getAllStudent().add(s3);
        s3.getAllCourse().add(c3);
        //输出一门课信息，观察一门课多少学生：
        System.out.println(c1);
        Iterator<Student> iter = null;
        iter = c1.getAllStudent().iterator();
        System.out.println("C1 选课情况 ：  ");
        while(iter.hasNext())
        {
            Student c =  iter.next();
            System.out.println("\t|-" + c);
        }
        System.out.println("----------------------------");
        System.out.println("学校学生情况： ");
        iter = sch.getAllStudent().iterator();
        while(iter.hasNext())
        {
            Student stu = (Student) iter.next();
            System.out.println("\t|-" + stu);
        }
        System.out.println("----------------------------");
        //张5的选课情况：
        System.out.println("学生张武选课情况： ");
        System.out.println(s3);
        Iterator<Course> it = s3.getAllCourse().iterator();
        while(it.hasNext())
        {
            Course c = it.next();
            System.out.println("\t|-" + c);
        }
        
    }
}

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