Can I have multiple java SDK versions installed on my machine?
Java 1.4 Java 2 Java 6 Java 7
please advise as I have to develop solutions for Maximo in Java 1.4
But make sure you use right path in your projects. It will be better to use some IDE like Eclipse. It will handle jdk path problems for you.
Java 1.4 is very old, try to shift to new one as soon as possible.