添加一个字符串'临时'价值ArrayList的每一个新的价值，而不会覆盖previous'临时'

问题描述

我输入从插座使用 DataInputSteam 来了，因为我可以有几种不同的字符串值都被分配以同样的 clientDayOfWeek 字符串，我无法弄清楚如何将所有进来到同一个ArrayList中的字符串值保存，无需更换的最后一个值。我也想没有重复，如果可能的。

  Socket套接字= NULL;
       DataInputStream以DataInputStream以= NULL;
       DataInputStream以=新DataInputStream所（
                              socket.getInputStream（））;       串clientDayOfWeek = dataInputStream.readUTF（）;
       ArrayList的＆LT;串GT; AR =新的ArrayList＆LT;串GT;（）;
       字符串TEMP = clientDayOfWeek;
       ar.add（临时）;
       System.out.print（列表中的项目：+ AR）;
 

解决方案

感谢Prasaanth，这就是我在做什么错。

我需要我的的ArrayList＆LT;串GT; AR =新的ArrayList＆LT;串GT;（）; 是全球性的，简化了剩下的我的方法里面如下：

  DataInputStream以=新DataInputStream所（
                        socket.getInputStream（））;
   ar.add（dataInputStream.readUTF（））;
   System.out.print（芳：+ AR）;
 

My input is coming from a socket using DataInputSteam and because I can have several different String values all being assigned to same clientDayOfWeek string, I cannot figure out how to save all the string values coming in into the same ArrayList without replacing the last value. I'd also like no duplicates if possible.

       Socket socket = null;
       DataInputStream dataInputStream = null;
       dataInputStream = new DataInputStream(
                              socket.getInputStream());

       String clientDayOfWeek = dataInputStream.readUTF();
       ArrayList<String> ar = new ArrayList<String>();
       String temp = clientDayOfWeek;
       ar.add(temp);
       System.out.print("Items in list: "+ ar);

解决方案

Thanks Prasaanth, that's what I was doing wrong.

I needed my ArrayList<String> ar = new ArrayList<String>(); to be global and simplified the rest as follows inside my method.

dataInputStream = new DataInputStream(
                        socket.getInputStream());
   ar.add(dataInputStream.readUTF());
   System.out.print("ar: "+ar);

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