以下程序运行完之后想再继续做题需要再运行。如何做到重复出题，按某一健才不出题那

[yimaoyingbi]

import java.util.Random;
import java.util.Scanner;
public class JiaFa
{
int a;
int b;
int sum;
public int JiaF()

{
Random random = new Random();
this.a = random.nextInt(10);
this.b = random.nextInt(10);
System.out.println(a + "+" + b+ "=");
return sum = a + b;

}
public void showTitle()
{
System.out.println("请计算此题目：");
}

public static void main(String[] args)
{
JiaFa he = new JiaFa();

he.showTitle();
he.JiaF();
Scanner sc = new Scanner(System.in);
int c = sc.nextInt();

if( he.sum == c)
{
System.out.println("正确。");
}
else
{
System.out.println("错误，正确答案为： " + he.sum );
}

}
}

[飞跃颠峰]

输入q后按回车退出

	public static void main(String[] args) {
		JiaFa he = new JiaFa();
		Scanner sc = new Scanner(System.in);

		while (true) {
			he.showTitle();
			he.JiaF();
			int c;
			try {
				c = sc.nextInt();
				if (he.sum == c) {
					System.out.println("正确。");
				} else {
					System.out.println("错误，正确答案为： " + he.sum);
				}
			} catch (InputMismatchException e) {
				String s = sc.nextLine();
				if (s.equals("q"))
					break;
			}
		}
	}