Update ExamSystem.java

src/ExamSystem.java

@@ -1,16 +1,22 @@
+import java.nio.charset.StandardCharsets;
 import java.util.Scanner;
 
 /**
  * 系统界面
  */
 public class ExamSystem {
-  private final Scanner scanner = new Scanner(System.in);
+  private final Scanner scanner = new Scanner(System.in, StandardCharsets.UTF_8);
   
   public Users login() {
     Users users = null;
     while (users == null) {
       System.out.print("请输入用户名和密码: ");
       String input = scanner.nextLine();
+      if (input.equals("-1")) {
+        System.out.println("exit");
+        System.exit(0);
+      }
+      
       String[] parts = input.split(" ");
       if (parts.length == 2) {
         users = Users.login(parts[0], parts[1]);