模拟选课过程

//定义一课程表，模拟一个选课的过程，统计有多少人进行了选课操作
//File:Student.java
class Student{
    private String num;
    private String name;
    private int age;
    private char sex;
    private String major;
    private String classes;
    public Student(){}
    public Student(String num,String name,int age,char sex,String major,String classes){
        this.num=num;
        this.name=name;
        this.age=age;
        this.sex=sex;
        this.major=major;
        this.classes=classes;
    }
    public String getName(){
        return name;
    }
    public void setName(String name){
        this.name=name;
    }
    //省略部分getter和setter方法
}

//File:Course.java
import java.util.ArrayList;
class Course{
    private String id;
    private String name;
    private int credithour;
    protected static int counter;
    private ArrayList <Student>stulist=new ArrayList<Student>();
    public Course(){}
    public Course(String id,String name,int credithour){
        this.id=id;
        this.name=name;
        this.credithour=credithour;
    }
    public void bookCourse(Student stu){
        stulist.add(stu);
        counter++;
    }
    public void getMessage(){
        System.out.println("课程编号："+id);
        System.out.println("课程名称："+name);
        System.out.println("课程学分："+credithour);
        System.out.println("已选课人数："+counter);
        System.out.println("选课人名单：");
        for(int i=0;i<stulist.size();i++)
            System.out.println(((Student)stulist.get(i)).getName());       
    }
}

//File:CourseTest.java
class CourseTest{
    public static void main(String[] args){
        Course courseA=new Course("1001","数据结构",3);
        Course courseB=new Course("1003","操作系统",2);
        Student stuA=new Student("001","小刚",20,'M',"软件工程","三班");
        Student stuB=new Student("002","小红",21,'f',"软件工程","五班");
        Student stuC=new Student("003","张三",22,'M',"软件工程","二班");
        Student stuD=new Student("004","莉莉",19,'f',"软件工程","四班");
      courseA.bookCourse(stuA);
      courseA.bookCourse(stuB);
      courseB.bookCourse(stuC);
      courseB.bookCourse(stuD);
      courseA.getMessage();
      courseB.getMessage();
      System.out.println("共有"+Course.counter+"个学生已选课");
    }
}


//输出结果如下
C:/Documents and Settings/Administrator/桌面/CourseTest>java CourseTest
课程编号：1001
课程名称：数据结构
课程学分：3
已选课人数：4
选课人名单：
小刚
小红
课程编号：1003
课程名称：操作系统
课程学分：2
已选课人数：4
选课人名单：
张三
莉莉
共有4个学生已选课

C:/Documents and Settings/Administrator/桌面/CourseTest>