java - 调用另一个类时出现 NoSuchElementException

Question

我正在尝试编写一个游戏，您可以在其中探索和查找资源，但是当我尝试调用“探索类”时，它会运行以下代码:

Scanner scanner = new Scanner(System.in);
    int choose;
    boolean keep = false;
    do{
    System.out.println("Who would you like to send to explore?");
    System.out.println("=======================================");
    System.out.println(" *\t1. Simon                     *");
    System.out.println(" *\t2. Lily                      *");
    System.out.println(" *\t3. Axel                      *");
    System.out.println(" *\t4. Exit Exploring            *");
    System.out.println("=======================================");
    choose = scanner.nextInt();

返回主类并执行以下操作:

System.out.println("===================================");
        System.out.println("\t 1. Explore");
        System.out.println("\t 2. Use Resources");
        System.out.println("\t 3. View Stats");
        System.out.println("\t 4. Sleep");
        System.out.println("===================================");
        option = scanner.nextInt();//where I believe the exception happened

它抛出异常:java.util.NoSuchElementException

我在探索类结束时完成了 scanner.close();，但我不确定它是否导致了问题。

谁能向我解释一下我的代码中的错误吗？

Answer 1

尝试使用

if(scanner.hasNextInt()){
    option = scanner.nextInt();
}