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Programs of any significant size are broken down into logical pieces called methods. It was recognized long ago that programming is best done in small sections that are connected in very specific and formal ways. Java provides the construct of a function, allowing the programmer to develop new functions not provided in the original Java libraries. Breaking down a program into blocks or sections leads to another programming issue regarding identifier scope. Also, functions need to communicate with other parts of a program that requires the mechanics of parameter lists and a return value. The key topics for this lesson are:
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