public static void main(String[] args) throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        int[] input = new int[100];
        for (int i = 0; i < 100; i++) {
            int num = 0;
            boolean stop = false;
            while (!stop) {
                try {
                    System.out.print("Input: ");
                    String s = in.readLine();
                    if ("s".equals(s.toLowerCase())) {
                        return;
                    }
                    num = Integer.parseInt(s);
                    stop = true;
                    input[i] = num;
                } catch (NumberFormatException nfe) {
                    System.out.println("Input is invalid.Pls input again!");
                }
            }
        }
    }

------解决方案--------------------
while (!stop) {
 try {
 System.out.print("Input: ");
 String str = in.readLine());
 if ("s".equals(str.toLowerCase()) ){
    break ;
 }
 num = Integer.parseInt(str);
 input[i] = num;
 } catch (NumberFormatException nfe) {
 System.out.println("Input is invalid.");
 }