String String數組以及list之間的轉換

string轉string數組

      Stringstr="aa,bb,cc,dd,ee,ff";

      String[]strArr= str.split(",");

      System.out.println("*********str*****"+str);

      System.out.println("*********strArr*****"+strArr);

     

string數組轉string(借用StringBuffer)

      StringBufferstrb= newStringBuffer();

      for (int i = 0; i < strArr.length; i++) {

        strb.append(strArr[i]+",");

      }

      System.out.println("*********strb*****"+strb.toString());

 

      string數組轉list

      String[]strarr={"aa","bb","cc","dd","ee","ff"};

      List<String>list = newArrayList<String>();

      for(int i=0;i<strarr.length;i++){

        list.add(strarr[i]);

        }

 

      list轉string

      //先自定義一個list

      List<String>mylist = new ArrayList<String>();

      mylist.add("qq");

      mylist.add("ww");

      mylist.add("ee");

      mylist.add("rr");

      //list轉數組

      String[]mylistArray =  mylist.toArray(newString[mylist.size()]);

      StringBuffersb = new StringBuffer();

      for(inti=0;i<mylistArray.length;i++){

        sb.append(mylistArray[i]); 

      }

      StringsbToString = sb.toString();

      System.out.println("*********sbToString*******"+sbToString);

     

   System.out.println("*********mylist.get(2)*******"+mylist.get(0));

      if(strarrinstanceof  String[]){

        System.out.println("******************true***************");

      }