Math_Paper_Generator/src/Math_System.java

import Base.User;
import Deal.Deal_paper;
import Deal.Deal_user;

import java.util.Scanner;

public class Math_System {
    private User now_user;
    private Deal_paper d_paper;
    private Deal_user d_user;
    private Scanner scanner;

    public Math_System(){
        now_user=null;
        d_paper=null;
        d_user=new Deal_user();
    }

    public void main_menu(){
        scanner=new Scanner(System.in);
        while(true){
            if (now_user==null){
                login_in();
            }
            else {
                generator();
            }
        }
    }

    public void login_in(){
        System.out.println("请输入用户名和密码（空格分隔）:");
        String input = scanner.nextLine().trim();

        if (input.equalsIgnoreCase("exit")) {
            System.exit(0);
        }

        String[] parts = input.split("\\s+"); //空格

        if (parts.length != 2){
            System.out.println("请输入正确的用户名、密码");
            return;
        }

        String username=parts[0];
        String psw=parts[1];

        if (d_user.login(username,psw)==null) {
            now_user=null;
            System.out.println("请输入正确的用户名、密码");
        }
        else {
            now_user=d_user.login(username,psw);
            d_paper=new Deal_paper(now_user);
            System.out.println("当前选择为 " + now_user.getUserType() + " 出题");
        }
    }

    public void generator(){
        System.out.println("准备生成"+now_user.getUserType()+"数学题目，请输入生成题目数量（输入-1将退出当前用户，重新登录）：");
        String input = scanner.nextLine().trim();

        if (input.equals("-1")){
            now_user=null;
            d_paper=null;
            return;
        }
        if (input.startsWith("切换为")) {
            change_mode(input);
            return;
        }
        try {
            int count = Integer.parseInt(input);
            if (count<10||count>30){
                System.out.println("题目数量应在10-30之间。");
                return;
            }
            d_paper.g_paper(count,now_user.getUsername());
        }catch (NumberFormatException e){
            System.out.println("请正确输入题目数量。");
        }
    }

    public void change_mode(String new_mode){
        String[] parts=new_mode.split("切换为");
        String type=parts[1].trim();
        if ((!type.equals("小学") && !type.equals("初中") && !type.equals("高中")) || parts.length!=2){
            System.out.println("请输入小学、初中和高中三个选项中的一个");
        }
        else{
            now_user.change_type(type);
            d_paper=new Deal_paper(now_user);
            System.out.println("成功切换为"+type);
        }
    }
}