Thinking in Java Chapter4 Exercise10 吸血鬼数字

import java.util.Arrays;

public class Exercise10 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String[] num1, num2;
        for (int i = 10; i < 100; i++) {
            for (int j = 10; j < 100; j++) {
                int value = i * j;
                if (value < 1000 || value > 9999)
                    continue;
                num1 = String.valueOf(value).split("");
                num2 = (String.valueOf(i) + String.valueOf(j)).split("");
                Arrays.sort(num1);
                Arrays.sort(num2);
                if (Arrays.equals(num1, num2))
                    System.out.println(i + "*" + j + "=" + value);
            }
        }
    }

}

15*93=1395
21*60=1260
21*87=1827
27*81=2187
30*51=1530
35*41=1435
41*35=1435
51*30=1530
60*21=1260
80*86=6880
81*27=2187
86*80=6880
87*21=1827
93*15=1395