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JDK stands for Java Development Kit. It is the software that you must install in your computer to write Java programs. Along with this you must install the JRE - Java Runtime Environment using which you can run/execute the java programs you wrote using the JDK. Together the JDK and JRE give you all the tools and libraries you need to write java programs.
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.
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.
JDK is java development kit whereas J2SDK is the newer one and is called as Java 2 software development kit.
Yes, just make sure that your classpaths are setup correctly so that you compile and run programs using the desired version of the JDK.