public static void main(String[] args) { String str1 = "劉燁,孫堅,王二小,蜘蛛俠,鋼鐵俠,毛劍卿"; String str2 = "王二小,李占軍,劉胡蘭,毛劍卿";  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("結果：" + sb.toString().substring(0, sb.toString().length() - 1));  }