Java语言用户输入错误与导入文件

Question

我面临这个问题，我的代码没有错误。这是代码。请记住，请记住我在Android Studio上写Java，因为我正在从事应用程序开发。

练习.java

package com.example.javastart;
import java.util.Scanner;

public class practice {
public static void main(String[] args) {
    System.out.println("Taking Input");
    Scanner sc = new Scanner(System.in);
    System.out.println("Enter Number for Table ");
    int a = sc.nextInt();


    for (int i = 1; i <= 10; i++) {
        int total = a * i;
        System.out.println(a + " * "+ i + " = "+ total);

    }
}

}

这是一些错误

Task :javastart:practice.main() FAILED
Taking Input
Enter Number for Table 
Exception in thread "main" java.util.NoSuchElementException
at java.base/java.util.Scanner.throwFor(Scanner.java:937)
at java.base/java.util.Scanner.next(Scanner.java:1594)
at java.base/java.util.Scanner.nextInt(Scanner.java:2258)
at java.base/java.util.Scanner.nextInt(Scanner.java:2212)
at com.example.javastart.practice.main(practice.java:9)

 Execution failed for task ':javastart:practice.main()'.

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

Answer 1

nosuchelementException 如果没有更多令牌，将抛出。这是由调用 nextInt（）而无需检查是否可用的整数引起的。尝试使用hasnextint（）在调用 nextint（）之前检查是否有任何令牌。