Many-to-many mapping relationships in Java

Many pairs of mappings can be demonstrated with students and courses. One student can choose multiple courses, and one course corresponds to multiple students.

Defining student Classes

Class stu{    private String name;    Private String num;    Private course[] Course;    Public Stu () {} public    Stu (String name,string num) {        this.name = name;        This.num = num;    }    Public String GetName () {        return name;    }    public void SetName (String name) {        this.name = name;    }    Public String Getnum () {        return num;    }    public void Setnum (String num) {        this.num = num;    }    Public course[] GetCourse () {        return Course;    }    public void Setcourse (course[] Course) {        this.course = Course;    }    Public String GetInfo () {        return name: "+name+": "+num;    }}

Defining Course Classes

Class course{    private String name;    Private stu[] Stu;    Public Course () {} public    Course (String name) {        this.name = name;    }    Public String GetName () {        return name;    }    public void SetName (String name) {        this.name = name;    }    Public stu[] Getstu () {        return Stu;    }    public void Setstu (stu[] Stu) {        this.stu = Stu;    }    Public String GetInfo () {        return "course  :" +name;    }        }

In the Main method test

First, the Stu and course objects are defined, each with three

        Stu S1 = new Stu ("Zhang San", "001");        Stu s2 = new Stu ("John Doe", "002");        Stu s3 = new Stu ("Harry", "003");                Course C1 = new Course ("Java");        Course C2 = new Course ("PHP");        Course C3 = New Course ("Python");

Set each other's relationships, each object has multiple objects corresponding to

        Set up the relationship between students and courses        S1.setcourse (new course[]{c1,c2});        S2.setcourse (New course[]{c1,c3});        S3.setcourse (New course[]{c2,c3});                The relationship between the corresponding curriculum and the students        C1.setstu (new stu[]{s1,s2});        C2.setstu (New Stu[]{s1,s3});        C3.setstu (New STU[]{S2,S3});

Access to course information according to the student

        System.out.println (S1.getinfo () + "class selected by students");        for (int i=0; I<s1.getcourse (). length; i++) {            System.out.println (S1.getcourse () [I].getinfo ());        }

Run

Access to student information according to the course

        System.out.println (C2.getinfo () + "Select Student information for this course");        for (int i=0; I<c2.getstu (). length; i++) {            System.out.println (C2.getstu () [I].getinfo ());        }

Run

Many-to-many mapping relationships in Java (go)