Path: csiph.com!usenet.pasdenom.info!news.albasani.net!.POSTED!not-for-mail
From: Lew <noone@lewscanon.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: unchecked conversion warning.
Date: Sun, 10 Jun 2012 23:50:16 -0700
Organization: albasani.net
Lines: 46
Message-ID: <jr44f5$eq7$1@news.albasani.net>
References: <3s7cs7hd18l0ffci55ns0286n4lc4cutlu@4ax.com> <265ea956-a3ed-4e76-8fc9-9ce9728f6b37@googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
X-Trace: news.albasani.net KQb2lpWCMiSC+5/weNgQNbXDbKAzbSHrp4fDfllaGScic08RkAo3rgBdqwWPevt7B9qeYkY1jezmo+EyXCqRHZQ0dHPFixOQjnliSseL6ZtifSSMvaalun3XqJQ71Gpv
NNTP-Posting-Date: Mon, 11 Jun 2012 06:50:13 +0000 (UTC)
Injection-Info: news.albasani.net; logging-data="/iOEXjXYjQdVW3MgvIwRJx0rSSnhLUrBevw+KPiYCBmcLq45Sfi5z9ixfNizAGhGBfmZn50MGlKGy3ctCWk7/E6CKqa/1ZnqeqBbnkn7IfktM2ULkmSwUBQ/tcV0Ggvs"; mail-complaints-to="abuse@albasani.net"
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1
In-Reply-To: <265ea956-a3ed-4e76-8fc9-9ce9728f6b37@googlegroups.com>
Cancel-Lock: sha1:UKAKV71dt8KEEcCtmEsv+zmhbvc=
Xref: csiph.com comp.lang.java.programmer:15202

Broad Liyn wrote:
> （未知）写道：
>> This code compiles with an 'unchecked conversion' warning.
>> I have tried various corrections, for example casting like (Vector<Object>), but to no
>> avail.
>> What am I doing wrong?l
>> The code is the smallest demo I could make from the original application.
>>
>> import java.util.Vector;
>> public class genericsdemo
>> {
>>    private static Vector<Vector>  vdata = new Vector<Vector>(); //a Vector of Vectors

Vector<Vector<?>>

>>    private static Vector<Object>  vrow  = new Vector<Object>(); //a row
>>
>>    public static void main(String args[]) {
>>      vrow.add(null); //two columns in the row
>>      vrow.add(null);
>>
>>      vdata.add(vrow); //add the row to the Vector of Vectors
>>
>>      Vector vtmp = getrow(); //test

Raw types are bad.

>>    }
>>
>>    private static Vector<Object>  getrow() {
>>      return vdata.elementAt(0);  //warning: [unchecked] unchecked conversion
>>    }
>> }
>>

> 1.vector is no longer being supported.
> 2.

Do you mean 'Vector', as in 'java.util.Vector'? Because spelling counts in Java.

If so, then you're mistaken, and if not, you need to explain what you mean.

-- 
Lew
Honi soit qui mal y pense.
http://upload.wikimedia.org/wikipedia/commons/c/cf/Friz.jpg