java Realization of Students' Course Selection System

This paper shares the specific code of java to realize the student course selection system for your reference, the specific contents are as follows

Case requirements:

Students (student number, name, major, selected course { < 3})
Teacher (job number, name, course taught { < 3})
Courses (course number, course name, credits, teacher, selected students { < 30})

The code of the course selection system is as follows:

//teacher

public class Teacher {
 private int id;
 private String teacherName;
 private Course[] courses;
 // Constructor 
 public Teacher() {
  super();
  courses= new Course[3];
 }
 public Teacher(int id,String teacherName){
  this.id=id;
  this.teacherName=teacherName;
  courses = new Course[3];
 }
 // Modify or add attributes 
 public int getId() {
  return id;
 }
 public void setId(int id) {
  this.id = id;
 }
 public String getTeacherName() {
  return teacherName;
 }
 public void setTeacherName(String teacherName) {
  this.teacherName = teacherName;
 }


}

/**
  *  Curriculum 
*/

public class Course {
 private String courseName;
 private int courseId;
 private Teacher teacher;
 private float credit;
 private Student[] students;
 // Constructor 
 public Course(int courseId,String courseName,float credit,Teacher teacher) {
  super();
  this.courseId=courseId;
  this.courseName=courseName;
  this.credit=credit;
  this.setTeacher(teacher);
  students = new Student[30];
 }
 public Course(int courseId,String courseName,float credit) {
  super();
  this.courseId=courseId;
  this.courseName=courseName;
  this.credit=credit;
  students = new Student[30];
 }

 public Course(int courseId,String courseName) {
  super();
  this.courseId=courseId;
  this.courseName=courseName;
  students = new Student[30];
 }

 public Course() {// The default form should be in case of ten thousand 1
  super();
  students = new Student[30];
 }

 // Modify or get property values id , name , credit , 
 public void setId(int id){
  this.courseId=id;
 }
 public int getId(){
  return this.courseId;
 }
 public void setName(String name){
  this.courseName=name;
 }
 public String getName(){
  return this.courseName;
 }
 public void setCredit(float credit ){
  this.credit=credit;
 }
 public float getCredit(){
  return this.credit;
 }
 public Teacher getTeacher() {
  return teacher;
 }
 public void setTeacher(Teacher teacher) {
  this.teacher = teacher;
 }

 // Enroll students in the class 
 public boolean addStudent(Student stu){
  boolean flag = false;// Flag value: whether the addition was successful 
  // If the student has not taken this course and the students in the same course are not full, it will be implemented 
  if(!isSelectedStudent(stu)&&isNullStudent(stu)){
   for(int i=0;i<students.length;i++){
    if(students[i]==null){
     students[i]=stu;
     flag=true;
     break;
    }
   }
  }
  return flag;
 }
 // Class removes students 
 public boolean removeStudent(Student stu){
  boolean flag=false;
  if(isSelectedStudent(stu)){// Have taken this course 
   for(int i=0;i<students.length;i++){
    if(students[i]==stu){
     students[i]=null;
     flag=true;
     break;
    }
   }
  }
  return flag;
 }
 // Displays the students of the selected course: 
 public void displayStudent(){
  System.out.println(" Selected courses: "+this.courseName+" Of the students are :");
  for(Student s:students){
   if(s!=null){
    System.out.print(s.getStuName()+" ");
   }
  }
  System.out.println();
 }
 // Sub-method 1 Have students ever taken this course 
 public boolean isSelectedStudent(Student stu){
  boolean flag=false;
  for(Student s:students){// Can only be used for inspection, cannot be modified 
   if(s==stu){
    flag=true;
    break;
   }
  }
  return flag;
 }
 // Sub-method 2 Does the number of students in the subject not reach the limit 
 public boolean isNullStudent(Student stu){
  boolean flag=false;
  for(Student s:students){
   if(s==null){// There are still vacancies 
    flag=true;
    break;
   }
  }
  return flag;
 }
 public static void main(String[] args) {
  // TODO Auto-generated method stub

 }


}

/**
 *  Student code 
 * @author Floris0811
 */
public class Student {
 private String stuName;
 private int stuId;
 private String major;
 private Course[] courses;
 // Constructor 
 public Student() {// Don't forget 
  super();
  courses = new Course[3];
 }
 public Student(int stuId,String stuName) {
  super();
  this.stuId=stuId;
  this.stuName=stuName;
  courses = new Course[3];
 }
 public Student(int stuId,String stuName,String major) {
  super();
  this.stuId=stuId;
  this.stuName=stuName;
  this.major = major;
  courses = new Course[3];
 }
 // Modify the get property name,id,major
 public String getStuName() {
  return stuName;
 }

 public void setStuName(String stuName) {
  this.stuName = stuName;
 }
 public int getStuId() {
  return stuId;
 }
 public void setStuId(int stuId) {
  this.stuId = stuId;
 }
 public String getMajor() {
  return major;
 }
 public void setMajor(String major) {
  this.major = major;
 }
 // Students choose courses; 
 public boolean addCourse(Course course){
  boolean flag=false;
  if(!isSelectedCourse(course)&&isNullCourse(course)){
   for(int i=0;i<this.courses.length;i++){
    if(courses[i]==null){
     courses[i]=course;
     course.addStudent(this);// Students should also be added to the course 
     flag=true;
     break;
    }
   }
  }
  return flag;
 }
 // Students remove courses 
 public boolean removeCourse(Course course){
  boolean flag=false;
  if(isSelectedCourse(course)){
   for(int i=0;i<this.courses.length;i++){
    if(courses[i]==course){
     courses[i]=null;
     course.removeStudent(this);// Remove students from the course 
     flag=true;
     break;
    }
   }

  }
  return flag;
 }
 // Displays the course selected by the student 
 public void displayCourse(){
  System.out.println(" Students "+this.stuName+" The selected courses are: ");
  for(Course c:courses){
   if(c!=null){
    System.out.print(c.getName()+" ");
   }
  }
  System.out.println();
 }

 // Sub-method 1 Have you ever chosen a class 
 public boolean isSelectedCourse(Course course){
  boolean flag=false;
  for(Course c:courses){
   if(c==course){
    flag=true;
    break;
   }
  }
  return flag;
 }
 // Sub-method 2 Are there any elective courses available for students 
 public boolean isNullCourse(Course course){
  boolean flag=false;
  for(Course c:courses){
   if(c==null){
    flag=true;
    break;
   }
  }
  return flag;
 }


}

package test;

public class ChooseCourseByStu {

 /**
  *  Course selection management system 
  */
 public static void main(String[] args) {
  Student stu0 = new Student(1001,"Lily");
  Student stu1 = new Student(1002,"Eilly");
  Student stu2 = new Student(1003,"Floris");
  Student stu3 = new Student(1004,"HaHa");
  Course cour0 = new Course(001," High number ");
  Course cour1 = new Course(002," Line generation ");
  Course cour2 = new Course(003," Probability theory ");
  stu0.addCourse(cour0);
  stu0.addCourse(cour2);
  stu0.addCourse(cour1);
  stu1.addCourse(cour2);
  stu1.addCourse(cour0);
  stu2.addCourse(cour1);
  stu3.addCourse(cour0);
  stu3.addCourse(cour1);
  stu1.removeCourse(cour2);
  stu0.displayCourse();
  cour0.removeStudent(stu1);
  cour1.displayStudent();
 }

}

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