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：

//teacherpublic 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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