Introduction to Java Programming编程题12.2<InputMismatchException>

Okwarry

于 2015-09-28 19:14:32 发布

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分类专栏： Java 文章标签：异常处理

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运行结果：

Enter two digital number: tr ru hd
Invalid digital number.
Enter two digital number: 45 qa
Invalid digital number.
Enter two digital number: 12 11
12 + 11 = 23

InputException.java

import java.util.InputMismatchException;
import java.util.Scanner;

public class InputException {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        do {
            System.out.print("Enter two digital number: ");

            try {
                int a = input.nextInt();
                int b = input.nextInt();
                int sum = a + b;
                System.out.println(a + " + " + b + " = " + sum);
                break;
            }
            catch (InputMismatchException ex) {
                System.out.println("Invalid digital number.");
                input.nextLine();
                continue;
            }
        } while (true);
    }
}