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.