集合小练习

课程类

public class Course {
  private String name;
  private int score;
  private List<Student> students;
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public int getScore() {
    return score;
  }
  public void setScore(int score) {
    this.score = score;
  }
  public List<Student> getStudents() {
    return students;
  }
  public void setStudents(List<Student> students) {
    this.students = students;
  }
  public Course() {
    super();
    // TODO Auto-generated constructor stub
    students = new ArrayList<Student>();
  }
  public Course(String name, int score) {
    this();
    this.name = name;
    this.score = score;
  }
  @Override
  public String toString() {
    return "Course [name=" + name + ", score=" + score ;
  }
  public void showInfo(){
    System.out.println("课程名称："+name+",课程学分："+score);
    if(students.size()==0){
      System.out.println("\t此课程尚未有学生选修");
      return ;
    }
    //遍历
    int no =1;
    Iterator<Student> it=students.iterator();
    while(it.hasNext()){
      Student  s=it.next();
      System.out.println("\t"+(no++)+",学生姓名："+s.getName()+",学生年龄："+s.getAge());
    }
  }
  
}

学生类

public class Student {
  private String name;
  private int age;
  private List<Course> courses;
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public int getAge() {
    return age;
  }
  public void setAge(int age) {
    this.age = age;
  }
  public List<Course> getCourses() {
    return courses;
  }
  public void setCourses(List<Course> courses) {
    this.courses = courses;
  }
  public Student() {
    super();
    // TODO Auto-generated constructor stub
    courses = new ArrayList<Course>();
  }
  public Student(String name, int age) {
    this();
    this.name = name;
    this.age = age;
  }
  public void showInfo(){
    System.out.println("=================华丽丽的分隔线=================");
    System.out.println("学生姓名："+name+",年龄："+age);
    if(courses.size()==0){
      System.out.println("\t该生尚未选课");
    }else{
      int no = 1;
      for(Course c:courses){
        System.out.println("\t"+(no++)+"\t课程名称："+c.getName()+"\t课程学分："+c.getScore());
      }
    }
    
  }
  
  
}

测试类

public static void chooseCourse(Student s,Course c){
    s.getCourses().add(c);
    c.getStudents().add(s);
  }

  public static void main(String[] args) {
    Student s1 = new Student("张三", 20);
    Student s2 = new Student("李四", 20);
    Student s3 = new Student("王五", 20);
    Student s4 = new Student("赵六", 20);
    
    Course c1=new Course("高等数学", 5);
    Course c2=new Course("线性代数", 3);
    Course c3=new Course("离散数学", 5);
    Course c4=new Course("概率论", 4);
    
    
    
    chooseCourse(s1, c1);
    chooseCourse(s1, c2);
    chooseCourse(s1, c3);
    
    chooseCourse(s2, c1);
    chooseCourse(s2, c2);
    chooseCourse(s2, c4);
    
    s1.showInfo();
    s2.showInfo();
    
    c1.showInfo();
    c2.showInfo();
    
    
    
  }

}