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JRE vs. JVM vs. Java Code

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Could someone please something for me?
I have a java applet that I am trying to upgrade - the source was coded with JDK 1.1.8 and I am upgrading it to 1.3 (changing deprecated methods and recompiling)
Now...What should I use for a JRE? 1.3? Can I use an earlier or later JRE?
How about requiring a JVM...can it only support a 1.3 or higher?
I guess I don't understand how all three (source, JRE, JVM) work together and what the dependencies are.
Can anyone straighten me out?
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Hello ,
well you can use jdk1.3 or later one ,well I want advise you to please read the documentation carefully .One more thing please see the jdk1.x very carefully .Well see ask questions .
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