java - 有没有办法循环输入请求，直到用户满足 BigInteger 中的条件？

Question

我想创建一个循环，重复请求输入，直到用户最终满足数字输入而不是字符串的条件。顺便说一句，我在这里使用 BufferedReader 。有没有办法在 BigInteger 和 BufferedReader 中重复它？

mainLoop: while(true) {
            System.out.println("Choose a number:");
            System.out.println("1 - Addition");
            System.out.println("2 - Subtraction");
            System.out.println("3 - Multiplication");
            System.out.println("4 - Division");
            System.out.println("5 - QUIT");

            try {
                int choice = Integer.parseInt(myObj.readLine());

                BigInteger Num1, Num2, sum, diff, qoutient, product;
                String num1 = null, num2 = null;

                switch (choice) {

                case 1: 

                    try {

                        num1 = myObj.readLine();
                        Num1 = new BigInteger(num1);
                        num2 = myObj.readLine();
                        Num2 = new BigInteger(num2);
                        sum = Num1.add(Num2);

                        System.out.println("The answer is "+sum);


                    } catch (NumberFormatException e){

                    }break;

输出实际上返回到主循环。

Answer 1

更新:

其实我已经找到答案了。我做了一个 while 循环。

subLoop: while (true) {
                    try {

                        System.out.println("Enter 2 numbers");

                        num1 = myObj.readLine();
                        Num1 = new BigInteger(num1);
                        num2 = myObj.readLine();
                        Num2 = new BigInteger(num2);
                        sum = Num1.add(Num2);

                        System.out.println("The answer is "+sum+ "\n");


                    } catch (NumberFormatException e){
                        System.out.println("Use numbers only.");
                        continue subLoop;
                    }
                    break; 
                }
            continue mainLoop;