1 public class Newbegin{
2 public static void main(String args[]) {
3 //第一步：根据结构进行关系设置
4 //1.创建各自的独立对象
5 Student stu1=new Student(1,"张三",18);
6 Student stu2=new Student(2,"李四",19);
7 Student stu3=new Student(3,"王五",18);
8 Course ca=new Course(1001,"马克思主义哲学",3);
9 Course cb=new Course(1002,"操作系统",2);
10 //2.设置学生和课程的关系，这里面需要准备出成绩
11 stu1.setStudentCourse(new StudentCourse[]{
12 new StudentCourse(stu1,ca,99.9),
13 new StudentCourse(stu1,cb,87.0),
14 });
15 stu2.setStudentCourse(new StudentCourse[]{
16 new StudentCourse(stu2,ca,78.9),
17 });
18 stu3.setStudentCourse(new StudentCourse[]{
19 new StudentCourse(stu3,cb,98.0),
20 });
21 //3.设置课程和学生的关系
22 ca.setStudentCourse(new StudentCourse[]{
23 new StudentCourse(stu1,ca,99.9),
24 new StudentCourse(stu2,ca,78.9)
25 });
26 cb.setStudentCourse(new StudentCourse[]{
27 new StudentCourse(stu1,cb,87.0),
28 new StudentCourse(stu3,cb,98.9)
29 });
30 //第二部：根据结构取出数据
31 //1.可以找到一门课程，以及参加此课程的所以学生信息，和他的成绩；
32 System.out.println(ca.getInfo());
33 for(int x=0;x<ca.getStudentCourse().length;x++){
34 System.out.print(" |-"+ca.getStudentCourse()[x].getStudent().getInfo());
35 System.out.print(",成绩："+ca.getStudentCourse()[x].getScore());
36 System.out.println();
37 }
38 //2.可以找到一名学生，以及参加的课程信息，和他的成绩
39 System.out.println("========================");
40 System.out.println(stu1.getInfo());
41 for(int x=0;x<stu1.getStudentCourse().length;x++){
42 System.out.print(" |-"+stu1.getStudentCourse()[x].getCourse().getInfo());
43 System.out.print(",成绩："+stu1.getStudentCourse()[x].getScore());
44 System.out.println();
45 }
46 }
47 }
48 class Student
49 {
50 private int stuid;
51 private String name;
52 private int age;
53 private StudentCourse studentCourse[];
54 public Student(){}
55 public Student(int stuid,String name,int age){
56 this.stuid=stuid;
57 this.name=name;
58 this.age=age;
59 }
60 public void setStudentCourse(StudentCourse studentCourse[]){
61 this.studentCourse=studentCourse;
62 }
63 public StudentCourse[] getStudentCourse(){
64 return this.studentCourse;
65 }
66 public String getInfo(){
67 return "【STUDENT】学生编号："+this.stuid+",姓名："+this.name+",年龄："+this.age;
68 }
69 }
70 class Course
71 {
72 private int cid;
73 private String name;
74 private int credit;
75 private StudentCourse studentCourse[];
76 public Course(){}
77 public Course(int cid,String name,int credit){
78 this.cid=cid;
79 this.name=name;
80 this.credit=credit;
81 }
82 public void setStudentCourse(StudentCourse studentCourse[]){
83 this.studentCourse=studentCourse;
84 }
85 public StudentCourse[] getStudentCourse(){
86 return this.studentCourse;
87 }
88 public String getInfo(){
89 return "【COURSE】课程编号："+this.cid+",名称："+this.name+",学分："+this.credit;
90 }
91 }
92 class StudentCourse//学生选课
93 {
94 private Student student;
95 private Course course;
96 private double score;
97 public StudentCourse(){}
98 public StudentCourse(Student student,Course course,double score){
99 this.student=student;
100 this.course=course;
101 this.score=score;
102 }
103 public Student getStudent(){
104 return this.student;
105 }
106 public Course getCourse(){
107 return this.course;
108 }
109 public double getScore(){
110 return this.score;
111 }
112 }
