2号网上商城系统

public class VampireNumber { 19 20 public static void main(String[] args) { 21 for(int i = 1; i < 100; i++){ 22 for(int j = i+1; j < 100; j++){ 23 //只要求输出四位数 24 if(i * j >= 1000){ 25 String a = i + "" + j; 26 String b = i * j + ""; 27 if(equal(a, b)){ 28 System.out.printf("%d * %d = %d", i, j, i*j); 29 System.out.println(); 30 } 31 } 32 } 33 } 34 } 35 36 //判断两个字符串包含的数字是否一致 37 private static boolean equal(String a, String b) { 38 //先排序 39 char[] as = a.toCharArray(); 40 char[] bs = b.toCharArray(); 41 Arrays.sort(as); //排序 42 Arrays.sort(bs); //排序 43 if(Arrays.equals(as, bs)){ 44 return true; 45 } 46 return false; 47 } 48 49 }