Java 错误消息：没有这样的元素异常？

我不确定为什么会收到以下消息：

Exception in thread "main" java.util.NoSuchElementException
    at java.util.Scanner.throwFor(Unknown Source)
    at java.util.Scanner.next(Unknown Source)
    at java.util.Scanner.nextInt(Unknown Source)
    at java.util.Scanner.nextInt(Unknown Source)
    at assessed_practical_2.PossibleQuestionSolution.main(PossibleQuestionSolution.java:24)

以下是我的主要方法代码：

    package assessed_practical_2;

    //Importing Resources (Random)
    import java.util.Random;
    //Importing Resources (Scanner)
    import java.util.Scanner;

    public class PossibleQuestionSolution {

        public static void main(String[] args) {

            // Setting up Scanner for User Input
            Scanner scanner = new Scanner(System.in);

            // var declaration
            int userChoice;

        do{ 
            // Invoke displaymenu
            displayMenu();

            // Get user Input for the menu
            System.out.println("Please enter choice from menu...");
            userChoice = scanner.nextInt();

            // Switch statement to decide which method to invoke dependent upon user input

            switch (userChoice) {

            case 1:
                sayUserName();
                break;
            case 2:
                sayUserNameLoop();
                break;
            case 3:
                generateRandomNumbers();
                break;
            case 4:
                triangleArea();
                break;
            case 5:
                System.out.println("Quitting Program");
                break;
            default:
                System.out.println("Sorry didnt recognise Input");
            }// Switch Statement end

        }while (userChoice!=5);

        System.out.println("Goodbye...");

            scanner.close();
        }// end of main method

---

非常感谢您的帮助，我想这是一个关于扫描仪的nextint行的问题，但我无法修复它

我更改了以下内容，似乎允许我的程序运行：

公共类可能方程解{

// Setting up Scanner for User Input
public static Scanner scanner = new Scanner(System.in);

public static void main(String[] args) {

    // var declaration
    int userChoice;

do{ 
    // Invoke displaymenu
    displayMenu();

    // Get user Input for the menu
    System.out.println("Please enter choice from menu...");
    userChoice = scanner.nextInt();

    // Switch statement to decide which method to invoke dependent upon user input

    switch (userChoice) {

    case 1:
        sayUserName();
        break;
    case 2:
        sayUserNameLoop();
        break;
    case 3:
        generateRandomNumbers();
        break;
    case 4:
        triangleArea();
        break;
    case 5:
        System.out.println("Quitting Program");
        break;
    default:
        System.out.println("Sorry didnt recognise Input");
    }// Switch Statement end

}while (userChoice!=5);

System.out.println("Goodbye...");


}// end of main method

---

基本上，我所做的是将扫描器更改为所有方法都可以使用的公共资源，这似乎已经解决了问题，不再出现错误异常。

您应该检查nextLine或nextLine是否存在，因此您应该有类似的内容：while scanner.hasNextLine（）{}或while scanner.hasNextLine（）{}您没有显示可能出现此错误的确切行，我担心此代码为我编译并运行时没有错误。我们需要更多信息。