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My problem: I have JDK 1.7 version on my machine. The jar I created with this does not run on my Unix machine as it has JRE 1.4 installed (I don't have admin rights to this machine).

So, is there a way to compile my code with version 1.4 w/o uninstalling 1.7 on my machine. Can it be done online?

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You may use -target version option to perform cross-compilation.

Example as per javadoc

% javac -target 1.4 -bootclasspath jdk1.4.2/lib/classes.zip \              -extdirs "" OldCode.java

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According to the javac documentation, you can set the JDK source using -source parameter:

javac -source 1.4 MyClass
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This ,this and this are very good sites where you can run all your java code online and get the results, without having JDK installed in your machine

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this doesn't answer the question.

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