Running java program on 1.4.2 but has a 1.5 command

Hi,
I am programming using Java 1.5 so I used java.lang.String.contains but all my lab computers only have 1.4.2. That is the only function I am using from 1.5, is there any way to extract the code and maybe just add it as a procedure to my Java file instead? or maybe extra Java.lang.String to a jar file and include it in my project?
Thanks,
RishiD

Also, String calls native code, which you will not be able to patch. In addition, String has dependencies to other classes that may also be different in 1.5.
This is a bad idea.
sjasja is right. You need to use the 1.4.2 command until you are certain that all of your target machines are running 1.5. You can specify source and target if you have a 1.5 compiler in the lab (-source 1.4 -target 1.4) and it will compile that command, and run on 1.4.2 boxes, but you cannot compile it with a 1.4.2 compiler.
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