dealing with compiler warning

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2 total messages Started by Alan Shiers Thu, 04 Aug 2005 20:22

#413

Author: Alan Shiers
Date: Thu, 04 Aug 2005 20:22

43 lines
2322 bytes

Hi there,

I'm using JDK 1.5 and created an instance of an ArrayList, then after
loading the ArrayList I passed it as an arguement to the
Collections.sort(...) method.  When I compile using:

javac -Xlint:unchecked -classpath "C:\Program Files\Apache Softwa
re Foundation\Tomcat 5.5\common\lib\servlet-api.jar;C:\Program Files\Apache
Soft
ware Foundation\Tomcat 5.5\common\lib\jsp-api.jar;C:\Program Files\Apache
Softwa
re Foundation\Tomcat 5.5\webapps\scholastic\WEB-INF\classes;C:\Program
Files\Apa
che Software Foundation\Tomcat
5.5\webapps\scholastic\WEB-INF\classes\mvcs;C:\Pr
ogram Files\Apache Software Foundation\Tomcat
5.5\webapps\scholastic\WEB-INF\cla
sses\com\components;C:\Program Files\Apache Software Foundation\Tomcat
5.5\webap
ps\scholastic\WEB-INF\classes\com\ezjavabeans\ezsmtp;C:\Program Files\Apache
Sof
tware Foundation\Tomcat
5.5\webapps\scholastic\WEB-INF\lib\jasperreports-0.6.7.j
ar" *.java

I got the following warning message:

TestProcessor.java:153: warning: [unchecked] unchecked method invocation:
<T>sor
t(java.util.List<T>) in java.util.Collections is applied to
(java.util.ArrayList
<mvcs.TestProcessor.Answer>)
         Collections.sort(list);
                         ^
1 warning

What is it I need to do further to prevent this warning message from popping
up all the time? Am I supposed to ignore it or is there something I'm
expected to do to prevent this warning message?

Please advise,

Alan

Re: dealing with compiler warning

#415

Author: Jeroen Wenting
Date: Mon, 08 Aug 2005 12:16

41 lines
2200 bytes

"Alan Shiers" <ashiers@hfx.eastlink.ca> wrote:
>Hi there,
>
>I got the following warning message:
>
>TestProcessor.java:153: warning: [unchecked] unchecked method invocation:
><T>sor
>t(java.util.List<T>) in java.util.Collections is applied to
>(java.util.ArrayList
><mvcs.TestProcessor.Answer>)
>         Collections.sort(list);
>                         ^
>1 warning
>
>What is it I need to do further to prevent this warning message from popping
>up all the time? Am I supposed to ignore it or is there something I'm
>expected to do to prevent this warning message?
>
>Please advise,
>
>Alan
>
>

Add the annotation @suppresswarnings("unchecked") to the method (or class if you want it to be global for that class) declaration.
E.g. turn
-------------------
public void aMethod(List list) {
  Collections.sort(list);
}
-------------------
into
-------------------
@suppresswarnings("unchecked")
public void aMethod(List list) {
  Collections.sort(list);
}
-------------------

I'm not fond of annotations, but this is one case they could come in handy (though of course it's like shooting a moquito with an elephant gun as you're potentially hiding warnings you do want to soo).

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