Cannot compile java file after ..

i installed java sdk 1.4
uninstalled java 1.2 & java 1.3.1
--after that i was not able to compile or run java file
reinstalled java 1.3.1 and 1.2
--now able to run previously compiled java file
--cannot compile a new java file
any help

It would be helpful if you would exactly tell us what error message you get instead of just saying "I can't compile or run anything anymore".
Things to think of: Did you add the bin directory of the JDK to your path? Is the classpath set correctly?
Installation notes
http://java.sun.com/j2se/1.4/install-windows.html
Setting the class path
http://java.sun.com/j2se/1.4/docs/tooldocs/win32/classpath.html
Java 2 SDK Readme
http://java.sun.com/j2se/1.4/README.html
Jesper

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Cannot compile java file after ..

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