if « Statements « SCJP

5.7.if
	5.7.1.	The basic format of an if statement
	5.7.2.	The expression in an if statement must be a boolean expression.
	5.7.3.	Use an else block to execute code that is executed under the conditions that the test returns false.
	5.7.4.	Use if/else in a nested fashion, refining conditions to more specific, or narrower, tests at each point.

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