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2.2.3 强制类型转换(cast) 类型范围小的变量不可以直接赋值给类型范围大的变量，除非使用强制类型转换，否则会报错。强制类型转换的格式如下：大数据类型变量1 = (小数据类型) 变量2或者是数据; ...

【Java从入门到头秃专栏】(二) 注释数据类型变量常量关键字标识符运算符输入输出（一）

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