java实现学生信息统计系统

不念不忘少年蓝@ 2022-06-08 02:55 232阅读 0赞

### 学生信息查询 ###

#### 功能： ####

1.通过id修改学生信息

2.获取指定学生的成绩

3.获取指定学号的成绩

4.根据姓名修改指定学科的成绩

5.删除指定学生及其成绩

6.统计所有成绩相等的人数

7.获取到所有学生某一科的成绩

### 代码块 ###

package com.lanou.work01;
    
    import java.util.ArrayList;
    import java.util.HashSet;
    
    public class ProgramSystem { 
    
        public static void main(String[] args) {
            ArrayList<Student> listStudent = new ArrayList<Student>();
    
            // 学生小李
            Student student = new Student(1, "小李");
            Subject subject1 = new Subject("语文", 90.7);
            Subject subject2 = new Subject("数学", 10.5);
            student.list.add(subject1);
            student.list.add(subject2);
    
            // 学生小王
            Student student2 = new Student(1, "小王");
            Subject subject3 = new Subject("语文", 20.7);
            Subject subject4 = new Subject("数学", 10.5);
            student2.list.add(subject3);
            student2.list.add(subject4);
    
            // 装进大的数组
            listStudent.add(student);
            listStudent.add(student2);
            System.out.println(listStudent.size());
    
            Control control = new Control(listStudent);
            //以下注释内容为功能测试
            // control.getScore(student, "语文");
            // System.out.println("-------------------------");
            // control.getId(1, "数学");
            // System.out.println("-------------------------");
            // control.upDateName(1, "小陈");
            // System.out.println(student.nameString);
            // System.out.println("-------------------------");
            // control.upDateScore("小陈", "语文", 0.0);
            // System.out.println(student);
            // control.removeStudent(student);
            // System.out.println(listStudent);
            // control.countStudnet(student, "语文");
            control.fun("语文");
        }
    }
    
    class Control {
        // 存放学生的数组
        ArrayList<Student> listStudent = new ArrayList<Student>();
    
        public Control(ArrayList<Student> listStudent) {
            this.listStudent = listStudent;
        }
        //展示方法
        public void show(){
            System.out.println("*************************");
        }
    
        // 获取指定学生的成绩
        public void getScore(Student student, String bookName) {
            for (Student student2 : listStudent) {
                if (student.nameString.equals(student2.nameString)) {
    
                    for (Subject sub : student.list) {
                        // 每一个成绩类对象
                        if (bookName.equals(sub.nameBook)) {
                            System.out.println(sub.Score);
                        }
                    }
                }
    
            }
        }
        // 获取指定学号的成绩
        public void getId(int id, String bookName) {
            for (Student student2 : listStudent) {
                if (student2.id == id) {
       // 如果id相等话
                    for (Subject sub : student2.list) {
                        // 每一个成绩类对象
                        if (bookName.equals(sub.nameBook)) {
                            System.out.println(sub.Score);
                        }
                    }
    
                }
    
            }
        }
    
        // 根据id修改姓名
        public void upDateName(int id, String name) {
            for (Student student : listStudent) {
                if (student.id == id) {
       // 如果想等的话
                    student.nameString = name;
                }
            }
        }
    
        // 根据姓名修改指定学科的成绩
        public void upDateScore(String name, String bookName, Double score) {
            for (Student student : listStudent) {
                if (student.nameString.equals(name)) {
                    for (Subject subject : student.list) {
                        if (subject.nameBook.equals(bookName)) {
                            subject.Score = score;
                        }
                    }
                }
            }
        }
        // 删除指定学生及其成绩
        public void removeStudent(Student student) {
            Student student3 = new Student();
            System.out.println(listStudent);
            for (Student student2 : listStudent) {
                if (student2.nameString.equals(student.nameString)) {
                    student3 = student2;
                }
            }
            listStudent.remove(student3);
        }
    
        // 统计所有成绩相等的人数
        public void countStudnet(Student student, String namString) {
            int count = 1;
            // 创建一个数组
            double array[] = new double[listStudent.size()];
            System.out.println(listStudent.size());
            for (Student student2 : listStudent) {
                for (int i = 0; i < array.length; i++) {
                    System.out.println("数组的长度"+array.length);
                    for (Subject subject : student2.list) {
                        if (subject.nameBook.equals(namString)) {
                            System.out.println(namString);
                            array[i] = subject.Score;
                            System.out.println(array[i]);
                        }
                    }
                }
            }
            // 第一个和第二个比较
            for (int i = 0; i < array.length; i++) {
                for (int j = i + 1; j < array.length; j++) {
                    if (array[i] == array[j]) {
                        count++;
                    }
                }
            }
            System.out.println("语文成绩相等的人数为：" + count);
    
        }
    
        // 获取到所有学生的成绩
        public void fun(String nameString) {
            HashSet<Double> set = new HashSet<Double>();
            for (Student student2 : listStudent) {
                        for (Subject subject : student2.list) {
                             if (nameString.equals(subject.nameBook)) {
                                set.add(subject.Score); 
                            }   
                        }   
                }
            System.out.println(set);
        }
    }
    //学生类
    class Student {
    
        String nameString;
        int id;
        ArrayList<Subject> list = new ArrayList<Subject>();
    
        public Student(int id, String nameString) {
            this.id = id;
            this.nameString = nameString;
    
        }
    
        @Override
        public String toString() {
            // TODO Auto-generated method stub
            for (Subject subject : list) {
                return "姓名:" + nameString + "学号:" + id + "成绩单:" + subject.nameBook
                        + subject.Score;
            }
            return null;
    
        }
    
        public Student() {
    
        }
    }
    
    // 学科类
    class Subject {
    
        String nameBook;
        double Score;
    
        public Subject(String nameBook, double score) {
            super();
            this.nameBook = nameBook;
            Score = score;
        }
    
    }