下列标识符哪些是不合法的（）。A、+staticB、J_catC、-3.14159avaD、5books - 查题网

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高等继续教育 / Java程序设计

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下列标识符哪些是不合法的（）。
A、+static
B、J_cat
C、-3.14159ava
D、5books

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Java程序设计

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