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As of February 2, 2012 the latest public release of the standard edition of Java is Java Standard Edition(SE) 7 update 3.
First of all, it's "JDK", not "jdk", and "Java", not "java". What do you mean by "Java new edition"? I do not find that term when I Google for it. "Java 2 SE" is a brand name for very old, obsolete versions of Java, between version 1.2 and 1.4, inclusive. The current version of "Java SE" (Java Standard Edition), as it is now called, is version 7, with support still available for version 6. These versions are also called 1.7 and 1.6, respectively. See <http://www.oracle.com/technetwork/java/javase/jdk7-naming-418744.html>
When you update to a new version of Java you usually don't need to keep the old version installed. Note that if you do remove the old version and suddenly your program (or a program that you use) no longer works correctly, then you probably need to reinstall the old version.
Java 7 is the most current version of Java. Many movies and games use Java.