JDK is java development kit whereas J2SDK is the newer one and is called as Java 2 software development kit.
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The JDK (Java Developer's Kit) is included in the SDK (Software Developer's Kit), which also includes other things such as application and applet tools.
No, the JDK includes the JRE.
J2EE = enterprise edition jdk. J2SE = standard edition jdk. J2ME = mobile edition jdk. standard jdk gets used for platform development, enterprise jdk for enterprise development and mobile jdk gets used for mobile development.
The best way to find out if your Java is up to date is to visit the Java website. You can then check the latest verison number, and compare it to what is already on your computer. You check in your programs and files. You can also choose to update, and if you have the current version it won't do it.
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>
No, not necessarily. JDK stands for Java Development Kit and JRE stands for Java Runtime Environment. They can be of the same or different versions each. It is better if we have two compatible or same versions of JDK and JRE installed for ease of use.