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系统退出在程序结束时发生，但它应该像内部 while 循环一样工作。欢迎任何建议。这是我收到的错误消息：

Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:907)
at java.util.Scanner.next(Scanner.java:1530)
at java.util.Scanner.nextInt(Scanner.java:2160)
at java.util.Scanner.nextInt(Scanner.java:2119)
at beast.main(beast.java:75)

这是我的代码 

while(loopkey==1){//Call Methods and enables user to pick another exercise
    UserManual();
    System.out.print("Input the topickey here: ");//prompts for topic
    int topickey=kbd.nextInt();//scans topickey(which is an int)

    if(topickey==1)DoAdditionEx(j);//does addition
    else if(topickey==2)DoSubtractionEx(j);//does subtraction
    else if(topickey==3)DoMultiplicationEx(j);//does multiplication
    else{
        int errorkey=1;
        while(errorkey==1){
            System.out.print("ERROR: COMMAND NOT RECONGISED\nPlease reselect your topic of interest: ");
            topickey=kbd.nextInt();
            if(topickey==1 || topickey==2 || topickey==3) errorkey=0;
        }
    }
    if(topickey==1)DoAdditionEx(j);//does addition
    else if(topickey==2)DoSubtractionEx(j);//does subtraction
    else if(topickey==3)DoMultiplicationEx(j);//does multiplication

    System.out.println("Would you like to continue practicing? Please enter '1' for yes or '0' for no.");
    System.out.print("Input your choice here: ");

    int multitopickey=kbd.nextInt();
    if(multitopickey!=1) loopkey=0;
}
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1 回答 1

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好的，所以我解决了这个问题。在一些我没有包含的代码中（因为它有多长），我关闭扫描仪的时间比我预期的要早（在我的方法中）。这样的错误会带来：

线程“main”中的异常 java.util.NoSuchElementException –</p>

任何有此问题的人，请检查您的扫描仪。感谢所有感兴趣的人！

于 2014-11-16T02:27:15.980 回答