Java基础——学生管理系统_学生管理系统java基础

通过学习Java基础，采取循环，判断等语句来实现一个简单的学生管理系统

学生类

public class Student {
    //学号
    private String sid;
    //姓名
    private String name;
    //年龄
    private String age;
    //居住地
    private String address;

    public Student() {
    }

    public Student(String sid, String name, String age, String address) {
        this.sid = sid;
        this.name = name;
        this.age = age;
        this.address = address;
    }

    public String getSid() {
        return sid;
    }

    public void setSid(String sid) {
        this.sid = sid;
    }

    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 getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}
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学生管理类

public class StudentManager {
    public static void main(String[] args) {
        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");
            System.out.println("请输入你的选择: ");

            Scanner sc = new Scanner(System.in);
            String line = sc.nextLine();

            switch (line) {
                case "1":
                    addStudent(arrayList);
                    break;
                case "2":
                    deleteStudent(arrayList);
                    break;
                case "3":
                    updateStudent(arrayList);
                    break;
                case "4":
                    findAllStudent(arrayList);
                    break;
                case "5":
                    System.out.println("谢谢使用");
                    System.exit(0);//JVM(Java虚拟机)退出
                default:
                    System.out.println("你输入的信息有误,现在重新进入系统");
            }
        }
    }

    //添加学生
    public static void addStudent(ArrayList<Student> arrayList) {
        Scanner sc = new Scanner(System.in);
        String sid;

        while (true){
            System.out.println("请输入学生学号: ");
            sid = sc.nextLine();

            boolean flag = isUsed(arrayList, sid);
            if (flag){
                System.out.println("你输入的学号已经被使用，请重新输入！");
            }else {
                break;
            }
        }

        System.out.println("请输入学生姓名: ");
        String name = sc.nextLine();
        System.out.println("请输入学生年龄: ");
        String age = sc.nextLine();
        System.out.println("请输入学生居住地: ");
        String address = sc.nextLine();
        //创建学生对象，并将键盘录入的数据赋值给学生对象的成员变量
        Student s = new Student();
        s.setSid(sid);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);
        //将学生对象添加到集合中
        arrayList.add(s);
        //给出添加成功的提示信息
        System.out.println("添加学生成功");
    }

    //判断学号是否被使用
    public static boolean isUsed(ArrayList<Student> arrayList,String sid){
        boolean flag = false;
        for (int i = 0;i<arrayList.size();i++){
            Student student = arrayList.get(i);
            if (student.getSid().equals(sid)){
                flag = true;
                break;
            }
        }

        return flag;
    }

    //删除学生
    public static void deleteStudent(ArrayList<Student> arrayList){
        int index = -1;
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入你要删除学生的学号: ");
        String sid = sc.nextLine();
        for (int i = 0;i<arrayList.size();i++){
            Student student = arrayList.get(i);
            if (student.getSid().equals(sid)){
                index = i;
                break;
            }
        }

        if (index == -1){
            System.out.println("输入的学生" + sid + "学号不存在");
        }else {
            arrayList.remove(index);
            System.out.println("删除学生信息成功");
        }
    }

    //修改学生信息
    public static void updateStudent(ArrayList<Student> arrayList){
        int index = -1;

        Scanner sc = new Scanner(System.in);
        System.out.println("请输入你需要修改的学生的学号: ");
        String sid = sc.nextLine();

        System.out.println("请输入学生新姓名: ");
        String name = sc.nextLine();
        System.out.println("请输入学生新年龄: ");
        String age = sc.nextLine();
        System.out.println("请输入学生新居住地: ");
        String address = sc.nextLine();

        Student student = new Student();
        student.setSid(sid);
        student.setName(name);
        student.setAge(age);
        student.setAddress(address);

        for (int i = 0;i<arrayList.size();i++){
            Student student1 = arrayList.get(i);
            if (student1.getSid().equals(sid)){
                index = i;
                break;
            }else {
                System.out.println("没有学号为" + sid + "的学生，重新进入修改学生信息状态");
                updateStudent(arrayList);
            }
        }
        if (index == -1){
            System.out.println("没有学号为" + sid + "的学生，重新进入修改学生信息状态");
        }else {
            arrayList.set(index,student);
            System.out.println("修改学生信息成功");
        }

    }
    //查看全部学生
    public static void findAllStudent(ArrayList<Student> arrayList) {
        if (arrayList.size() == 0) {
            System.out.println("暂无学生信息,请输入后再查询！");
        } else {
            System.out.println("学号\t\t\t姓名\t\t\t年龄\t\t\t居住地");
            for (int i = 0; i < arrayList.size(); i++) {
                Student student = arrayList.get(i);
                System.out.println(student.getSid() + "\t" + student.getName() + "\t\t\t" + student.getAge() + "岁\t\t" + student.getAddress());
            }
        }
    }

}
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现象