How to modify the content of a file

Hello All,
If anyone of you can help me in modifying the file conent.
let's say for example, to modify the properties file.
I've my.properties file with keys and values as follows.
show=false
secure=false
test=false
I would like to change the "false" value to "true" of any of the keys.
java /jsp code would be helpful.
appreciate your help in advance.

OK..
Break the problem down.
You need to:
1- Read the file into a String/String[]
2- Parse the file into its individual elements
3- change some of those elements
This involves searching the string for the index of where a particular word or combination occurs, and then finding out the value that follows it, and then changing that value...
4- re-construct the file
5- write the fileDoes the format of the file have to be the way you've presented it above? (Personally, I'd use a pseudo-XML tag style)
<productdisplay>true</productdisplay>
<stockdisplay>false</stockdisplay>
<addtobasket>true</addtobasket>~Dave

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thanks masijade,
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