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
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 );
}

}
}


[解决办法]
输入q后按回车退出

Java code

    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;            }        }    }