Can I reference another property in a properties file (use ${property}) [duplicate]

Possible Duplicate:
How to reference another property in java.util.Properties?

look at my "file.properties":

key1= My name is
key2= ${key1} Martin !

Why when I get the value of "key2" my result is "${key1} Martin !" unlike "My name is Martin !"

=> I program in Java 6
=> I use java.util.Properties

You might want look at Apache Configuration,

http://commons.apache.org/configuration/

Among many features it supports is the Variable Interpolation.

What you want to do is impossible using the Java Properties class.

Property keys and values are simply Strings. No processing happens to them, so you can't refer to another value in a value.