[Java知识库]java学生管理系统

学生管理系统（Java）

现有需求需要用Java写一个学生管理需求，可将该需求分解为如下几部分：
1.先创建一个学生类，该学生类包含学生学号，学生姓名，学生年龄，学生居住地址。

public class Student {
    //Alt ins快速键创建有参无参构造方法，get/set方法
    private  String  stuname;
    private  String name;
    private  String age;
    private  String arr;

    public String getStuname() {
        return stuname;
    }

    public void setStuname(String stuname) {
        this.stuname = stuname;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public String getArr() {
        return arr;
    }

    public void setArr(String arr) {
        this.arr = arr;
    }

    public Student() {
    }

    public Student(String stuname, String name, String age, String arr) {
        this.stuname = stuname;
        this.name = name;
        this.age = age;
        this.arr = arr;
    }
}

2.写一个main方法输出学生管理系统的页面，以及传入需要选择的选项。

public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ArrayList<Student> arrayList=new ArrayList<>();
       while (true){
           System.out.println("------------欢迎来到学生管理系统------------");
           System.out.println("1-添加学生");
           System.out.println("2-删除学生");
           System.out.println("3-修改学生");
           System.out.println("4-查看所有学生");
           System.out.println("5-退出系统");
           System.out.println("请输入你的选择：");
           int a=scanner.nextInt();
           switch (a){
               case 1:
                   addStu(arrayList);
                   break;
               case 2:
                   delStu(arrayList);
                   break;
               case 3:
                   uptStu(arrayList);
                   break;
               case 4:
                   showStu(arrayList);
                   break;
               case 5:
                   System.out.println("感谢使用本系统");
                   System.exit(0);//退出JVM终止循环
           }

       }

3.写一个addStu方法，用于添加学生信息。

private static void addStu(ArrayList<Student> arrayList) {
        Scanner scanner = new Scanner(System.in);
        Student s = new Student();
        System.out.println("请输入学生学号：");
        String stunumber = scanner.nextLine();
        if (checknum(stunumber, arrayList)) {//调用checknum检查添加学号是否已经存在
            System.out.println("已结有该学生学号，请重新输入！");
        } else {
            System.out.println("请输入学生姓名：");
            String stuName = scanner.nextLine();
            System.out.println("请输入学生年龄：");
            String stuAge = scanner.nextLine();
            System.out.println("请输入学生地址：");
            String stuArr = scanner.nextLine();
            s.setStuname(stunumber);
            s.setName(stuName);
            s.setAge(stuAge);
            s.setArr(stuArr);
            System.out.println("你确定要保存吗（y/n）？");
            String can = scanner.nextLine();
            if (can.equals("y")) {
                arrayList.add(s);
                System.out.println("添加成功！！！");
            } else {
                System.out.println("保存失败！！！");
            }
        }
    }

4.写一个showStu方法，用于查看所学生信息。

 private static void  showStu(ArrayList<Student> arrayList){
       if (arrayList.size()==0){
           System.out.println("系统中无信息，请输入信息。");
       }else {
           for (int i=0;i<arrayList.size();i++){
               Student s=arrayList.get(i);
               System.out.println("---学号------姓名------年龄------地址---");
               System.out.println("    "+s.getStuname()+"     "+s.getName()+"      "+s.getAge()+"岁     "+s.getArr()+"    ");
           }
       }

    }

5.写一个delStu方法，用于删除学生信息。

 private static void delStu(ArrayList<Student> arrayList) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要删除学生的学号：");
        String idstu = scanner.nextLine();
        for (int i = 0; i < arrayList.size(); i++) {
            Student student = arrayList.get(i);
            if (student.getStuname().equals(idstu)) {
                arrayList.remove(i);
                System.out.println("删除成功！");
                break;
            } 
        }

    }

6.写一个uptStu方法，用于修改学生信息。

 private static void uptStu(ArrayList<Student> arrayList) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("输入要修改学生的学号");
        String stunum = scanner.nextLine();
        for (int i = 0; i < arrayList.size(); i++) {
            Student student = arrayList.get(i);
            if (student.getStuname().equals(stunum)) {
                System.out.println("请输入新的姓名");
                String name = scanner.nextLine();
                System.out.println("请输入新的年龄");
                String age = scanner.nextLine();
                System.out.println("请输入新的地址");
                String arr = scanner.nextLine();
                student.setStuname(stunum);
                student.setName(name);
                student.setAge(age);
                student.setArr(arr);
                arrayList.set(i, student);
                System.out.println("修改成功");
                break;
            }
        }
    }

7.写一个checknum方法，用于判断添加的学生信息是否已经存在。

 private static boolean checknum(String stunumber, ArrayList<Student> arrayList) {
        Boolean string = false;
        for (int i = 0; i < arrayList.size(); i++) {
            Student student = arrayList.get(i);
            if (stunumber.equals(student.getStuname())) {
                string = true;
                break;
            } else {
                string = false;
                break;
            }
        }
        return string;
    }

8.整体代码实现。

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ArrayList<Student> arrayList = new ArrayList<>();
        while (true) {
            System.out.println("------------欢迎来到学生管理系统------------");
            System.out.println("1-添加学生");
            System.out.println("2-删除学生");
            System.out.println("3-修改学生");
            System.out.println("4-查看所有学生");
            System.out.println("5-退出系统");
            System.out.println("请输入你的选择：");
            int a = scanner.nextInt();
            switch (a) {
                case 1:
                    addStu(arrayList);
                    break;
                case 2:
                    delStu(arrayList);
                    break;
                case 3:
                    uptStu(arrayList);
                    break;
                case 4:
                    showStu(arrayList);
                    break;
                case 5:
                    System.out.println("感谢使用本系统");
                    System.exit(0);//退出JVM终止循环
            }

        }

    }

    private static void addStu(ArrayList<Student> arrayList) {
        Scanner scanner = new Scanner(System.in);
        Student s = new Student();
        System.out.println("请输入学生学号：");
        String stunumber = scanner.nextLine();
        if (checknum(stunumber, arrayList)) {//调用checknum检查添加学号是否已经存在
            System.out.println("已结有该学生学号，请重新输入！");
        } else {
            System.out.println("请输入学生姓名：");
            String stuName = scanner.nextLine();
            System.out.println("请输入学生年龄：");
            String stuAge = scanner.nextLine();
            System.out.println("请输入学生地址：");
            String stuArr = scanner.nextLine();
            s.setStuname(stunumber);
            s.setName(stuName);
            s.setAge(stuAge);
            s.setArr(stuArr);
            System.out.println("你确定要保存吗（y/n）？");
            String can = scanner.nextLine();
            if (can.equals("y")) {
                arrayList.add(s);
                System.out.println("添加成功！！！");
            } else {
                System.out.println("保存失败！！！");
            }
        }
    }

    private static void showStu(ArrayList<Student> arrayList) {
        if (arrayList.size() == 0) {
            System.out.println("系统中无信息，请输入信息。");
        } else {
            for (int i = 0; i < arrayList.size(); i++) {
                Student s = arrayList.get(i);
                if (i == 0) {
                    System.out.println("---学号------姓名------年龄------地址---");
                    System.out.println("    " + s.getStuname() + "     " + s.getName() + "      " + s.getAge() + "岁     " + s.getArr() + "    ");
                } else {
                    System.out.println("    " + s.getStuname() + "     " + s.getName() + "      " + s.getAge() + "岁     " + s.getArr() + "    ");
                }
            }
        }

    }

    private static void delStu(ArrayList<Student> arrayList) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要删除学生的学号：");
        String idstu = scanner.nextLine();
        for (int i = 0; i < arrayList.size(); i++) {
            Student student = arrayList.get(i);
            if (student.getStuname().equals(idstu)) {
                arrayList.remove(i);
                System.out.println("删除成功！");
                break;
            }
        }

    }

    private static boolean checknum(String stunumber, ArrayList<Student> arrayList) {
        Boolean string = false;
        for (int i = 0; i < arrayList.size(); i++) {
            Student student = arrayList.get(i);
            if (stunumber.equals(student.getStuname())) {
                string = true;
                break;
            } else {
                string = false;
                break;
            }
        }
        return string;
    }

    private static void uptStu(ArrayList<Student> arrayList) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("输入要修改学生的学号");
        String stunum = scanner.nextLine();
        for (int i = 0; i < arrayList.size(); i++) {
            Student student = arrayList.get(i);
            if (student.getStuname().equals(stunum)) {
                System.out.println("请输入新的姓名");
                String name = scanner.nextLine();
                System.out.println("请输入新的年龄");
                String age = scanner.nextLine();
                System.out.println("请输入新的地址");
                String arr = scanner.nextLine();
                student.setStuname(stunum);
                student.setName(name);
                student.setAge(age);
                student.setArr(arr);
                arrayList.set(i, student);
                System.out.println("修改成功");
                break;
            }
        }
    }
}