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java

1. How many keywords exist in Java?

2. What keywords are not used?

const and goto

3. Which of the following is not a keyword?

main

4. Are `true`, `false` and `null` keywords?

No, these are literals.

5. Which keywords are CamelCase?

None, all of them are lower-case

6. How could the keywords be organized?

http://www.codejava.net/java-core/the-java-language/java-keywords

error handling: assert(), catch(), finally(), throw(), throws(), try()
enumeration: enum(45)
others: super(46), this(47), void(48)
unused: const(49), goto(50)

7. When to use enumerations?

...