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This article mainly introduces java how to declare variables, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

Declare variable method: data type variable name = initial value; (declare variable can not assign initial value)

You need to declare before using variables.

You need to initialize (assign an initial value) before using a variable.

Variables cannot be declared repeatedly, that is, the same variable name cannot be declared multiple times.

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