Java提取两个字符串中的相同元素方法

public static void main(String[] args) { String str1 = "刘烨,孙坚,王二小,蜘蛛侠,钢铁侠,毛剑卿"; String str2 = "王二小,李占军,刘胡兰,毛剑卿";  String[] arr1 = str1.split(",") ; String[] arr2 = str2.split(",") ;  StringBuffer sb = new StringBuffer(); for (int i = 0; i < arr2.length; i++){ for (int j = 0; j < arr1.length; j++){  if (arr1[j].equals(arr2[i])){   sb.append(arr1[j] + ",") ;   }  } }   System.out.println("结果：" + sb.toString().substring(0, sb.toString().length() - 1));  }