Java课设-学生成绩管理系统

约定不等于承诺〃 2023-10-07 22:38 51阅读 0赞

**题目要求**：  
![在这里插入图片描述][b5453eb4a6274a9e97fe0f4aa4ec0653.png]  
**代码：**

**Student.java**:

public class Student {
        
        private long id;//学号
        private String name;//姓名
        private double math;//应用数学成绩
        private double English;//大学英语成绩
        private double Java;//java成绩
        private double computer;//计算机应用基础
        private double average;    //平均分
        private int n;  //总人数
        public double getAverage() {
        
            return average;
        }
    
        public void setAverage(double average) {
        
            this.average = average;
        }
    
        public Student(int n,long id, String name, double math, double english, double java, double computer, double average) {
        
            this.n = n;
        	this.id = id;
            this.name = name;
            this.math = math;
            this.English = english;
            this.Java = java;
            this.computer = computer;
            this.average=average;
        }
    	public Student() {
        
    
    	}
    
    	public int getNum() {
        
            return n;
        }
    
        public void setNum(int n) {
        
            this.n = n;
        }
        public long getId() {
        
            return id;
        }
    
        public void setId(long id) {
        
            this.id = id;
        }
    
        public String getName() {
        
            return name;
        }
    
        public void setName(String name) {
        
            this.name = name;
        }
    
        public double getMath() {
        
            return math;
        }
    
        public void setMath(double math) {
        
            this.math = math;
        }
    
        public double getEnglish() {
        
            return English;
        }
    
        public void setEnglish(double English) {
        
            this.English = English;
        }
    
        public double getJava() {
        
            return Java;
        }
    
        public void setJava(double Java) {
        
            this.Java = Java;
        }
    
        public double getComputer() {
        
            return computer;
        }
    
        public void setComputer(double computer) {
        
            this.computer = computer;
        }
        public double getAvg(Student student) {
        
            return ( (student.getMath() + student.getEnglish() + student.getJava() + student.getComputer())/4);
    
        }
        public void setAvg(double average) {
        
            this.average=average;
        }
    }

**StudentApplication.java**:

public class StudentApplication {
        
        public static Scanner scanner = new Scanner(System.in);
        public static ArrayList<Student> students = new ArrayList<>();
        public static void main(String[] args) {
        
            Student student = new Student();
            StudentManage sm=new StudentManage();
            while(true){
        
               int menuSelect=StudentManage.getMenu();
               switch (menuSelect){
        
                   case 1://输入学生相关信息
                       sm.addStudent(students);
                       break;
                    case 2://2按平均分降序排列
                        sm.sortStudent(students);
                        break;
                   case 3:// 3显示所有成绩
                       sm.showAllStudent(students);
                       break;
                    case 4: //4输入查询个人成绩
                        sm.searchStudent(students);
                        break;
                    case 5://5显示各科平均分，最高分，最低分
                    	sm.averageScore(students);
                    	break;
                    case 6://6退出成绩管理系统
                        System.out.println("即将退出成绩管理系统");
                        System.exit(0);
                   default:
                       System.out.println("请重新输入");
    
                       break;
    
                }
            }
    
        }
    }

**StudentManage.java**:

public class StudentManage {
        
        private static Scanner sc=new Scanner(System.in);
    
        //得到菜单
        public static int getMenu(){
        
    
            System.out.println("----------学生成绩管理系统----------");
            System.out.println("          1输入学生相关信息");
            System.out.println("          2按平均分降序排列");
            System.out.println("          3显示所有成绩");
            System.out.println("          4输入查询个人成绩");
            System.out.println("          5显示各科平均分，最高分，最低分");
            System.out.println("          6退出成绩管理系统");
            System.out.println("----------学生成绩管理系统----------");
            System.out.println("请选择菜单：");
            int select=StudentManage.sc.nextInt();
            return select;
        }
        //添加学生
        public   void addStudent(ArrayList<Student> students){
        
            Student student=new Student();
            System.out.println("请输入学生的学号");
            student.setId(sc.nextLong());
            System.out.println("请输入学生的姓名");
            student.setName(sc.next());
            System.out.println("请输入学生的应用数学成绩");
            student.setMath(sc.nextDouble());
            System.out.println("请输入学生的大学英语成绩");
            student.setEnglish(sc.nextDouble());
            System.out.println("请输入学生的java程序设计成绩");
            student.setJava(sc.nextDouble());
            System.out.println("请输入学生的计算机应用基础成绩");
            student.setComputer(sc.nextDouble());
            double avg = student.getAvg(student);
            student.setAverage(avg);
            students.add(student);
            //        提示信息
            System.out.println("添加成功");
        }
        //查询学生
        public void searchStudent(ArrayList<Student> students){
        
            if (students.size() == 0) {
        
                System.out.println("当前无数据，请添加后重试");
            } else {
        
                System.out.println("请输入要查找学生的学号：");
                long id = sc.nextLong();
                int flag = -1;
                Student student = new Student();
                //        查找对应学号，找到就退出
                for (int i = 0; i < students.size(); i++) {
        
                    student = students.get(i);
                    if (student.getId() == id) {
        
                        flag = i;
                        break;
                    }
                }
    
                if (flag == -1) {
        
                    System.out.println("未找到对应学号的学生，请确认后重新输入！");
                } else {
        
                    System.out.println("对应学号的学生成绩如下：");
                    System.out.println("学号\t\t\t姓名\t\t数学\t\t英语\t\tJava\t\tcomputer\t\t平均分\t\t");
                    System.out.format("%d\t%s\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\n", student.getId(), student.getName(), student.getMath(), student.getEnglish(), student.getJava(),student.getComputer(), student.getAvg(student));
                    System.out.println("查找信息成功！");
                }
            }
        }
        //按平均分排降序
        public void sortStudent(ArrayList<Student> students){
        
            if (students.isEmpty()) {
        
                System.out.println("当前无数据，请添加后重试");
            } else {
        
                for (int i = 0; i < students.size() - 1; i++) {
        
                    if (students.get(i).getAvg(students.get(i)) < students.get(i + 1).getAvg(students.get(i + 1))) {
        
                        Student tmp = students.get(i);
                        students.set(i, students.get(i + 1));
                        students.set(i + 1, tmp);
                    }
                }
    
                System.out.println("排序后的学生成绩");
                System.out.println("学号\t\t姓名\t\t数学\t\t英语\t\tJava\t\t计算机\t\t平均分");
                for (Student student : students) {
        
                    System.out.format("%d\t%s\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t\n",  student.getId(), student.getName(), student.getMath(), student.getEnglish(),  student.getJava() ,student.getComputer(), student.getAvg(student));
                }
            }
        }
        //显示所有成绩
        public void showAllStudent(ArrayList<Student> students){
        
            if (students.isEmpty()) {
        
                System.out.println("当前无数据，请先添加数据");
            } else {
        
                System.out.println("----------所有学生成绩如下----------");
                System.out.println("学号\t\t姓名\t\t数学\t\t英语\t\tJava\t\t计算机\t\t平均分");
                for (Student student : students) {
        
                    System.out.format("%d\t%s\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\n", student.getId(), student.getName(), student.getMath(), student.getEnglish(), student.getJava(),student.getComputer(), student.getAvg(student));
            }
            }
        }
        //各科平均分，最高分，最低分
            public void averageScore(ArrayList<Student> students){
        
            int n = students.size();
            double max1 = 0;
    		double min1 = students.get(0).getMath();;
            double sum1 = 0;
            for (int i = 0; i < n; i++) {
        
            	sum1 = sum1 + students.get(i).getMath();
            	 if (students.get(i).getMath() > max1) {
        
                     max1 = students.get(i).getMath();
                 }
                if (students.get(i).getMath() < min1) {
        
                    min1 = students.get(i).getMath();
                }
            	}
            System.out.println("应用数学的平均成绩="+sum1/n+" 最高成绩="+max1+" 最低成绩="+min1);
            
            double max2 = 0;
    		double min2 = students.get(0).getEnglish();;
            double sum2 = 0;
            for (int i = 0; i < n; i++) {
        
            	sum2 = sum2 + students.get(i).getEnglish();
            	if (students.get(i).getEnglish() > max2) {
        
                    max2 = students.get(i).getEnglish();
                }
                if (students.get(i).getEnglish() <= min2) {
        
                    min2 = students.get(i).getEnglish();
                }
            	}
            System.out.println("大学英语的平均成绩="+sum2/n+" 最高成绩="+max2+" 最低成绩="+min2);
            
            double max3 = 0;
    		double min3 = students.get(0).getJava();;
            double sum3 = 0;
            for (int i = 0; i < n; i++) {
        
            	sum3 = sum3 + students.get(i).getJava();
            	 if (students.get(i).getJava() > max3) {
        
                     max3 = students.get(i).getJava();
                 }
                if (students.get(i).getJava() <= min3) {
        
                    min3 = students.get(i).getJava();
                }
            	}
            System.out.println("Java的平均成绩="+sum3/n+" 最高成绩="+max3+" 最低成绩="+min3);
            
            double max4 = 0;
    		double min4 = students.get(0).getComputer();;
            double sum4 = 0;
            for (int i = 0; i < n; i++) {
        
            	sum4 = sum4 + students.get(i).getComputer();
            	 if (students.get(i).getEnglish() > max4) {
        
                     max4 = students.get(i).getComputer();
                 }
                if (students.get(i).getComputer() <= min4) {
        
                    min4 = students.get(i).getComputer();
                }
            	}
            System.out.println("计算机应用基础的平均成绩="+sum4/n+" 最高成绩="+max4+" 最低成绩="+min4);
            }
    }

**运行主界面**：  
![在这里插入图片描述][fec6af06989d4159af474d4df47d7c3f.png]

[b5453eb4a6274a9e97fe0f4aa4ec0653.png]: https://img-blog.csdnimg.cn/b5453eb4a6274a9e97fe0f4aa4ec0653.png
[fec6af06989d4159af474d4df47d7c3f.png]: https://img-blog.csdnimg.cn/fec6af06989d4159af474d4df47d7c3f.png