ADD file via upload

src/User.java

@@ -0,0 +1,70 @@
+import java.util.ArrayList;
+import java.util.Scanner;
+import java.io.IOException;
+
+public class User {
+    String username;
+    String password;
+    String level;
+    ArrayList<User> list1 = new ArrayList<>();
+    int state=1;
+    public boolean logon(){//登录
+        if(state==1){
+            try {
+                new ProcessBuilder("clear").inheritIO().start().waitFor();
+            } catch (IOException | InterruptedException e) {
+                //e.printStackTrace();
+            }
+//            try {
+//                Runtime.getRuntime().exec("cmd /c cls").waitFor();
+//            } catch (IOException | InterruptedException e) {
+//                e.printStackTrace();
+//            }
+            System.out.println("=== 中小学数学卷子自动生成程序 ===");
+            System.out.println("请输入账户名称，密码:");
+        }
+        Scanner sc=new Scanner(System.in);
+        String name=sc.next();
+        String word=sc.next();
+        for(int i=0;i<list1.size();i++){
+            if(name.equals(list1.get(i).username) && word.equals(list1.get(i).password)) {
+                username=name;
+                password=word;
+                level=list1.get(i).level;
+                state=1;
+                return true;
+            }
+        }
+        System.out.println("请输入正确的用户名、密码");
+        state=0;
+        return true;
+    }
+    public void start(){
+        initializeUser();
+        while(logon()){
+            if(state==0){
+                continue;
+            }else if(state==1){
+                problem p1 =new problem();
+                p1.start(this);
+            }
+        }
+    }
+    public User(String username, String password, String level) {
+        this.username = username;
+        this.password = password;
+        this.level = level;
+    }
+    private void initializeUser(){
+        list1.add(new User("张三1", "123", "小学"));
+        list1.add(new User("张三2", "123", "小学"));
+        list1.add(new User("张三3", "123", "小学"));
+        list1.add(new User("李四1", "123", "初中"));
+        list1.add(new User("李四2", "123", "初中"));
+        list1.add(new User("李四3", "123", "初中"));
+        list1.add(new User("王五1", "123", "高中"));
+        list1.add(new User("王五2", "123", "高中"));
+        list1.add(new User("王五3", "123", "高中"));
+    }
+}
+