${xyz}

[wilsonshamim]

Can any one help me understanding about ${ some txt here} What does this mean. Why do we use it. I have seen this at many places in the code


Regards,
Shamim
shamim.797@gmail.com

[sunde887]

Would you mind showing an example of it in code?

[wilsonshamim]

Ok
here is the code

<property file="build.properties"/>
<property file="../build.properties"/>
<property file="../../build.properties"/>
<property file="${user.home}/build.properties"/>

<property name="build.compiler" value="modern"/>
<property name="webapps.build" value="../build"/>
<property name="webapps.dist" value="../dist"/>
<property name="webapp.name" value="ROOT"/>


<!-- =================== BUILD: Create Directories ====================== -->
<target name="build-prepare">
<mkdir dir="${webapps.build}"/>
<mkdir dir="${webapps.build}/${webapp.name}"/>
</target>


This code you can find in the xml file. have you installed apche tomcat . this is the build file in the apche tomcat -> webapps ->root-> build.xml file.
Also I have such at different other places.

[ra4king]

That is the equivalent of Java variables in XML. See those "<property name=..." lines? Those are "variable declarations" and using ${...} is referencing those variables. Useful when you need globals so if you need to change them, you just change the original declaration instead of each one.

[pbrockway2]

If that's an ANT script the syntax is described in the manual.

[JosAH]

If that's an ANT script the syntax is described in the manual.

I implemented that feature once (naively, before I had my espresso) until I stumbled on this:

B = ${A}
A = ${B}

I had to change my entire replacement method ;-)

kind regards,

Jos

[wilsonshamim]

Thanks a lot for all your replies ... well understood about it. :)
will try to implement .

Regards,
Shamim