吸血鬼數字問題

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package org.study.sort; import java.util.Arrays; public class VampireNumber { public static void main(String[] args) { for ( int i = 1 ; i < 100 ; i++){ for ( int j = i+ 1 ; j < 100 ; j++){ //隻要求輸出四位數 if (i * j >= 1000 ){ String a = i + "" + j; String b = i * j + "" ; if (equal(a, b)){ System.out.printf( "%d * %d = %d" , i, j, i*j); System.out.println(); } } } } } //判斷兩個字元串包含的數字是否一緻 private static boolean equal(String a, String b) { //先排序 char [] as = a.toCharArray(); char [] bs = b.toCharArray(); Arrays.sort(as); //排序 Arrays.sort(bs); //排序 if (Arrays.equals(as, bs)){ return true ; } return false ; } }