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Java is a fairly well documented language. The Java standard library is documented in the Java API specifications (a.k.a. "Javadoc"). You can navigate through the library by clicking the links, or...

The [] denotes an array. More information about arrays: Arrays (The Java™ Tutorials > Learning the Java Language > Language Basics)

Back on topic,

I agree with norm and curmudgeon about the top-down approach rather than the left-to-right approach.

Frame out the basic structure (what classes you need, a rough idea of what...