Earlier in this chapter I stated that the comma operator (not the comma separator, which is used to separate definitions and method arguments) has only one use in Java: in the control expression of a for loop. In both the initialization and step portions of the control expression, you can have a number of statements separated by commas, and those statements will be evaluated sequentially.
Using the comma operator, you can define multiple variables within a for statement, but they must be of the same type.
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