How do I compile a .java with support for older versions of Java?

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Yes, you can set the version of compiler at compile time. And compile your java code into old versions of java.

From Oracle article :
http://docs.oracle.com/javase/1.5.0/docs/tooldocs/windows/javac.html

Cross-Compilation Example

Here we use javac to compile code that will run on a 1.4 VM.

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

You might also need following parameter to set denote the version of your code.

-source release

-Specifies the version of source code accepted.

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