Question

我制作了一个Java计算器，但是当我输入一个非常长的数字时，我收到了这个错误：线程中的异常＆＃34; main＆＃34; java.util.InputMismatchException：对于输入字符串：＆＃34; 77777777777777777777777＆＃34; 在java.util.Scanner.nextInt（Scanner.java:2123）在java.util.Scanner.nextInt（Scanner.java:2076）在question1.Question1.main（Question1.java:26）

这是我的编码：

package question1;
import java.util.Scanner;

public class Question1 {

   public static void main(String[] args) {int n1, n2;
    String operation;
    Scanner scannerObject = new Scanner(System.in);

    System.out.println("Please enter first number.");
    n1 = scannerObject.nextInt();

    Scanner op = new Scanner(System.in);
    System.out.println("Please enter your operation.");
    operation = op.next();

    System.out.println("Please enter second number.");
    n2 = scannerObject.nextInt();

    switch (operation)  {
    case "+":
        System.out.println("Your result is " + (n1 + n2));
        break;

    case "-":
        System.out.println("Your result is " + (n1 - n2));
        break;

    case "/":
        System.out.println("Your result is " + (n1 / n2));
        break;

    case "*":
        System.out.println("Your result is " + (n1 * n2));
        break;

    default:
        System.out.println("Could not compute. Please only enter integers.");
   }
   }
   }

感谢。：）

Answer 1

数字77777777777777777777777（23位）太长，无法放入int，因为maximum int possible is about 2 billion (10 digits)。它也太长了，不适合long, whose maximum value is 19 digits。

使用Scanner's nextBigInteger method包含一条错误消息，指出该数字太大，或将您的数据类型切换为BigInteger。

我一直在＆＃34;线程＆＃34;主要＆＃34; java.util.InputMismatchException＆＃34 ;?

1 个答案: