How to run java older version java program with newer version 1.6.

Hello frds.....i have a one query regarding jkd newer version. I was using older version of jdk 1.4 for my java program and projects' work. Now i installed newer version of java 1.6 in my machine, so when i tried to compile and run my older version programs in the newer version, its showing many errors. So can anybody helps me on this query that how can i run my older version java programs in newer version 1.6 or what types of changes i will be do in my java programs.
Thanks in advance
Kshitiz

EJP wrote:
so when i tried to compile and run my older version programs in the newer version, its showing many errorsI doubt it. There is only one incompatibility between 1.4 and 1.6, and that is the introduction of the 'assert' keyword. (or did that happen in 1.4?)I believe that was the one and only incompatible change made in 1.4.
(Although I'm saying that from memory, and 1.4 was a long time ago -- so the "one and only" part could be wrong.)

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How to run java older version java program with newer version 1.6.

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