java实现学生选课系统

本文为大家分享了java实现学生选课系统的具体代码，供大家参考，具体内容如下

案例要求：

学生（学号，姓名，专业，所选课程{<3}）
老师（工号，姓名，所教课程{<3}）
课程（课程号，课程名，学分，教师，已选课学生{<30}）

选课系统代码如下：

//teacher

public class Teacher {
private int id;
private String teacherName;
private Course[] courses;
//构造函数
public Teacher() {
 super();
 courses= new Course[3];
}
public Teacher(int id,String teacherName){
 this.id=id;
 this.teacherName=teacherName;
 courses = new Course[3];
}
//修改或是添加属性
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;
}

}

/**
 * 课程
*/

public class Course {
private String courseName;
private int courseId;
private Teacher teacher;
private float credit;
private Student[] students;
//构造函数
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() {//默认形式，要有以防万一
 super();
 students = new Student[30];
}

//修改或获取属性值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;
}

//课加入学生
public boolean addStudent(Student stu){
 boolean flag = false;//标志值：是否加入成功
 //如果学生没有选过这门课，同时课的学生还没满则执行
 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;
}
//课移除学生
public boolean removeStudent(Student stu){
 boolean flag=false;
 if(isSelectedStudent(stu)){//选过这门课
  for(int i=0;i<students.length;i++){
   if(students[i]==stu){
    students[i]=null;
    flag=true;
    break;
   }
  }
 }
 return flag;
}
//显示选择课程的学生：
public void displayStudent(){
 System.out.println("选择的课程："+this.courseName+"的学生有:");
 for(Student s:students){
  if(s!=null){
   System.out.print(s.getStuName()+" ");
  }
 }
 System.out.println();
}
//子方法1：学生是否选过这门课
public boolean isSelectedStudent(Student stu){
 boolean flag=false;
 for(Student s:students){//只能用于检查，不能修改
  if(s==stu){
   flag=true;
   break;
  }
 }
 return flag;
}
//子方法2：学科学生未达到限定人数吗
public boolean isNullStudent(Student stu){
 boolean flag=false;
 for(Student s:students){
  if(s==null){//还有空位
   flag=true;
   break;
  }
 }
 return flag;
}
public static void main(String[] args) {
 // TODO Auto-generated method stub

}

}

/**
* 学生代码
* @author Floris0811
*/
public class Student {
private String stuName;
private int stuId;
private String major;
private Course[] courses;
//构造函数
public Student() {//不要忘
 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];
}
//修改获取属性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;
}
//学生选课；
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);//课程也要添加学生
    flag=true;
    break;
   }
  }
 }
 return flag;
}
//学生移除课程
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);//在课程中移除学生
    flag=true;
    break;
   }
  }

}
 return flag;
}
//显示学生所选的课程
public void displayCourse(){
 System.out.println("学生"+this.stuName+"所选课程有：");
 for(Course c:courses){
  if(c!=null){
   System.out.print(c.getName()+" ");
  }
 }
 System.out.println();
}

//子方法1：课是否被选过
public boolean isSelectedCourse(Course course){
 boolean flag=false;
 for(Course c:courses){
  if(c==course){
   flag=true;
   break;
  }
 }
 return flag;
}
//子方法2：学生是否还有选修课位置
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 {

/**
 * 选课管理系统
 */
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,"高数");
 Course cour1 = new Course(002,"线代");
 Course cour2 = new Course(003,"概率论");
 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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来源：https://blog.csdn.net/Floris_lovelace/article/details/80860470