目录

创建一个学生管理系统

要求

总代码

Student.java

ManagementMent

创建思路

 创建学生类

创建主菜单

创建添加学生方法

查看信息方法

删除学生方法

修改学生方法

创建一个学生管理系统

要求

创建一个学生管理系统，能够完成：添加学生、查看学生信息、删除学生、修改学生、退出。

学生信息包括：学号、姓名、年龄、家庭住址。

总代码

Student.java

package StudentManageMent;

//学生类
public class Student {
    private String id;
    private String name;
    private String age;
    private String adderss;



    public Student(){

    }

    public void setId(String id){this.id = id;}
    public String getId(){return id;}

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

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

    public void  setAddress(String address){this.adderss=address;}
    public String getAdderss(){return adderss;}


}

ManagementMent

package StudentManageMent;

import java.util.*;


public class ManageMent {
    public static void main(String[] args) {
        ArrayList array = new ArrayList();
        while (true) {
            System.out.println("----------欢迎来到学生管理系统----------");
            System.out.println("1、查看学生信息");
            System.out.println("2、添加学生");
            System.out.println("3、修改学生");
            System.out.println("4、删除学生");
            System.out.println("5、退出");
            System.out.println("请选择");
            Scanner sc = new Scanner(System.in);
            int choose = sc.nextInt();
            switch (choose) {
                case 1:
                    findallStudent(array);
                    break;
                case 2:
                    addStudent(array);
                    break;
                case 3:
                    updataStudent(array);
                    break;
                case 4:
                    deleteStudent(array);
                    break;
                case 5:
                    System.out.println("感谢使用");
                    System.exit(0);
                default:
                    break;

            }
        }
    }

    //添加学生
    public static void addStudent(ArrayList array) {
        System.out.println("添加学生n");
        while (true) {
            Scanner sc = new Scanner(System.in);
            boolean flag = false;
            String id = new String();
            do {
                System.out.println("学号");
                id = sc.nextLine();
                flag = add1(array, id);
            } while (flag == true);
            System.out.println("姓名");
            String name = sc.nextLine();
            System.out.println("年龄");
            String age = sc.nextLine();
            System.out.println("家庭住址");
            String address = sc.nextLine();
            Student s = new Student();
            s.setId(id);
            s.setName(name);
            s.setAge(age);
            s.setAddress(address);
            array.add(s);
            System.out.println("输入”1“继续添加，输入其他任意键退出");
            int con = sc.nextInt();
            if (con == 1) {
                ;
            } else {
                break;
            }
        }

    }

    public static boolean add1(ArrayList array, String id) {
        boolean flag = false;
        for (int i = 0; i < array.size(); i++) {
            Student s = array.get(i);
            if (id.equals(s.getId())) {
                System.out.println("学号已存在,请重新输入");
                flag = true;
                break;
            }
        }
        return flag;

    }

    //查看信息
    public static void findallStudent(ArrayList array) {
        if (array.size() == 0) {
            System.out.println("无信息，请添加信息后再查询");
            return;
        } else {
            //排序
            Collections.sort(array, new Comparator() {
                @Override
                public int compare(Student o1, Student o2) {
                    if (o1.getId().compareToIgnoreCase(o2.getId()) > 0) {
                        return 1;
                    }else if(o1.getId().compareToIgnoreCase(o2.getId()) == 0){
                        return o1.getName().compareToIgnoreCase(o2.getName());
                    } else {
                        return -1;
                    }
                }
            });

            System.out.println("学生信息n");
            System.out.println("序t学号ttt姓名tt年龄tt家庭住址");
            for (int i = 0; i < array.size(); i++) {
                Student s = array.get(i);
                if (s.getName().length() == 2) {
                    System.out.println((i + 1) + "t" + s.getId() + "t" + s.getName() + "  t" + s.getAge() + "tt" + s.getAdderss());
                } else if (s.getName().length() == 4) {
                    System.out.println((i + 1) + "t" + s.getId() + "t" + s.getName() + " t" + s.getAge() + "tt" + s.getAdderss());
                }else{
                    System.out.println((i + 1) + "t" + s.getId() + "t" + s.getName() + "  t" + s.getAge() + "tt" + s.getAdderss());
                }
            }
        }
    }

    //删除学生
    public static void deleteStudent(ArrayList array) {
        System.out.println("删除学生n");
        System.out.println("请输入要删除学生的学号");
        Scanner sc = new Scanner(System.in);
        String del = sc.nextLine();
        int index = -1;
        for (int i = 0; i < array.size(); i++) {
            Student s = array.get(i);
            if (del.equals(s.getId())) {
                index = i;
                break;
            }
        }
        if (index == -1) {
            System.out.println("查无此人");
        } else {
            array.remove(index);
        }
    }

    //修改学生
    public static void updataStudent(ArrayList array) {
        System.out.println("修改学生n");
        System.out.println("请输入要修改学生编号");
        Scanner sc = new Scanner(System.in);
        int upd = sc.nextInt();
        String hah = sc.nextLine();
        Student s = new Student();
        System.out.println("修改后的学号");
        String id = sc.nextLine();
        System.out.println("修改后的姓名");
        String name = sc.nextLine();
        System.out.println("修改后的年龄");
        String age = sc.nextLine();
        System.out.println("修改后的家庭住址");
        String address = sc.nextLine();
        s.setId(id);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);
        array.set(upd - 1, s);
    }


}

创建思路

创建一个包，包下包括两个文件

 创建学生类

package StudentManageMent;

//学生类
public class Student {
    private String id;
    private String name;
    private String age;
    private String adderss;



    public Student(){

    }

    public void setId(String id){this.id = id;}
    public String getId(){return id;}

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

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

    public void  setAddress(String address){this.adderss=address;}
    public String getAdderss(){return adderss;}


}

创建主菜单

public static void main(String[] args) {
        ArrayList array = new ArrayList();
        while (true) {
            System.out.println("----------欢迎来到学生管理系统----------");
            System.out.println("1、查看学生信息");
            System.out.println("2、添加学生");
            System.out.println("3、修改学生");
            System.out.println("4、删除学生");
            System.out.println("5、退出");
            System.out.println("请选择");
            Scanner sc = new Scanner(System.in);
            int choose = sc.nextInt();
            switch (choose) {
                case 1:
                    findallStudent(array);
                    break;
                case 2:
                    addStudent(array);
                    break;
                case 3:
                    updataStudent(array);
                    break;
                case 4:
                    deleteStudent(array);
                    break;
                case 5:
                    System.out.println("感谢使用");
                    System.exit(0);
                default:
                    break;

            }
        }
    }

创建添加学生方法

//添加学生
    public static void addStudent(ArrayList array) {
        System.out.println("添加学生n");
        while (true) {
            Scanner sc = new Scanner(System.in);
            boolean flag = false;
            String id = new String();
            do {
                System.out.println("学号");
                id = sc.nextLine();
                flag = add1(array, id);
            } while (flag == true);
            System.out.println("姓名");
            String name = sc.nextLine();
            System.out.println("年龄");
            String age = sc.nextLine();
            System.out.println("家庭住址");
            String address = sc.nextLine();
            Student s = new Student();
            s.setId(id);
            s.setName(name);
            s.setAge(age);
            s.setAddress(address);
            array.add(s);
            System.out.println("输入”1“继续添加，输入其他任意键退出");
            int con = sc.nextInt();
            if (con == 1) {
                ;
            } else {
                break;
            }
        }

    }

添加学生中查看学号是否存在方法

public static boolean add1(ArrayList array, String id) {
        boolean flag = false;
        for (int i = 0; i < array.size(); i++) {
            Student s = array.get(i);
            if (id.equals(s.getId())) {
                System.out.println("学号已存在,请重新输入");
                flag = true;
                break;
            }
        }
        return flag;

    }

查看信息方法

//查看信息
    public static void findallStudent(ArrayList array) {
        if (array.size() == 0) {
            System.out.println("无信息，请添加信息后再查询");
            return;
        } else {
            //排序
            Collections.sort(array, new Comparator() {
                @Override
                public int compare(Student o1, Student o2) {
                    if (o1.getId().compareToIgnoreCase(o2.getId()) > 0) {
                        return 1;
                    }else if(o1.getId().compareToIgnoreCase(o2.getId()) == 0){
                        return o1.getName().compareToIgnoreCase(o2.getName());
                    } else {
                        return -1;
                    }
                }
            });

            System.out.println("学生信息n");
            System.out.println("序t学号ttt姓名tt年龄tt家庭住址");
            for (int i = 0; i < array.size(); i++) {
                Student s = array.get(i);
                if (s.getName().length() == 2) {
                    System.out.println((i + 1) + "t" + s.getId() + "t" + s.getName() + "  t" + s.getAge() + "tt" + s.getAdderss());
                } else if (s.getName().length() == 4) {
                    System.out.println((i + 1) + "t" + s.getId() + "t" + s.getName() + " t" + s.getAge() + "tt" + s.getAdderss());
                }else{
                    System.out.println((i + 1) + "t" + s.getId() + "t" + s.getName() + "  t" + s.getAge() + "tt" + s.getAdderss());
                }
            }
        }
    }

删除学生方法

//删除学生
    public static void deleteStudent(ArrayList array) {
        System.out.println("删除学生n");
        System.out.println("请输入要删除学生的学号");
        Scanner sc = new Scanner(System.in);
        String del = sc.nextLine();
        int index = -1;
        for (int i = 0; i < array.size(); i++) {
            Student s = array.get(i);
            if (del.equals(s.getId())) {
                index = i;
                break;
            }
        }
        if (index == -1) {
            System.out.println("查无此人");
        } else {
            array.remove(index);
        }
    }

修改学生方法

//修改学生
    public static void updataStudent(ArrayList array) {
        System.out.println("修改学生n");
        System.out.println("请输入要修改学生编号");
        Scanner sc = new Scanner(System.in);
        int upd = sc.nextInt();
        String hah = sc.nextLine();
        Student s = new Student();
        System.out.println("修改后的学号");
        String id = sc.nextLine();
        System.out.println("修改后的姓名");
        String name = sc.nextLine();
        System.out.println("修改后的年龄");
        String age = sc.nextLine();
        System.out.println("修改后的家庭住址");
        String address = sc.nextLine();
        s.setId(id);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);
        array.set(upd - 1, s);
    }