45 王强 · Pull Request !392 · 2022级03班/JAVA基础仓库

import java.util.Scanner;

public class a {
    public static void main(String[] args) {
        System.out.println("=============================");
        System.out.println("-     欢迎使用学生管理系统\t-");
        System.out.println("-   \t1.浏览所有学生信息\t\t-");
        System.out.println("-   \t2.添加学生信息\t\t-");
        System.out.println("-   \t3.修改学生信息\t\t-");
        System.out.println("-   \t4.删除学生信息\t\t-");
        System.out.println("-   \t5.查询学生信息\t\t-");
        System.out.println("-   \t6.退出管理系统\t\t-");
        System.out.println("=============================");
        Scanner s = new Scanner(System.in);
        String[] arr = new String[50];
        int index = 0;
        a:
        for (; ; ) {
            System.out.println("请输入你需要的功能：");
            int get = s.nextInt();
            switch (get) {
                case 1:
                    liulan(arr);
                    break;
                case 2:
                    System.out.println("请输入学生姓名：");
                    String tname = s.next();
                    tianjia(arr, tname);
                    break;
                case 3:
                    System.out.println("请输入要修改的学生姓名：");
                    String xname1 = s.next();
                    if (x(arr,xname1)==0){
                        System.out.println("请输入新的姓名：");
                        String xname2 = s.next();
                        xiugai(arr, xname1, xname2);
                    }else{
                        System.out.println("此人不在名单上！");
                    }
                    break;
                case 4:
                    System.out.println("请输入要删除的学生姓名：");
                    String sname = s.next();
                    shanchu(arr, sname);
                    break;
                case 5:
                    System.out.println("请输入要查询的学生姓名：");
                    String cname = s.next();
                    chaxun(arr, cname);
                    break;
                case 6:
                    System.out.println("已为您退出系统！");
                    break a;
                default:
                    System.out.println("暂无此功能，请重新输入！");
            }
        }
    }

public static void liulan(String[] arr) {
        System.out.println("已录入学生名单如下：");
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] != null) {
                System.out.println(arr[i]);
            }
        }
    }

public static void tianjia(String[] arr, String name) {
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] != null) {
                if (arr[i].equals(name)) {
                    System.out.println("该学生已录入！");
                    break;
                }
            } else {
                arr[i] = name;
                System.out.println("添加成功！");
                break;
            }
        }
    }

public static int x(String[] arr, String name) {
        boolean f = false;
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] != null) {
                if (arr[i].equals(name)) {
                    f = true;
                }
            }
        }
        if (f) {
            return 0;
        } else {
            return 1;
        }
    }

public static void shanchu(String[] arr, String name) {
        for (int i = 0; i < arr.length; i++) {
            if (arr[i].equals(name)) {
                arr[i] = null;
                System.out.println("删除成功！");
                break;
            }
        }
    }

public static void xiugai(String[] arr, String name1, String name2) {
        for (int i = 0; i < arr.length; i++) {
            if (name1.equals(arr[i])) {
                arr[i] = name2;
            }
        }
    }

public static void chaxun(String[] arr, String name) {
        boolean f = false;
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] != null) {
                if (arr[i].equals(name)) {
                    f = true;
                }
            }
        }
        if (f) {
            System.out.println("此人在名单上！");
        } else {
            System.out.println("查无此人！");
        }
    }
}

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