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I downloaded 'Eclipse IDE for Java EE Developers' for Linux from eclipse.org. I am able to write, compile and run Java programs. But I don't understand what JDK / JRE is being used.
If I start a new 'Java Project' I can choose which JRE to use, but if I choose for instance 'JavaSE-1.6' I still don't know what that is? Oracle? IBM? And I don't know where that JRE is in my file system.
Let's say I want to use that same JRE to execute my Java program from command line, how do I find the 'java' executable?