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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