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));
  
}