The default type for the new variable is "String".
新变量的默认类型是“String”。
Every local variable is initialized to the default value for its data type as soon as the procedure begins running.
只要程序一开始执行，每个区域变数就会初始化为所属资料型别的预设值。
Using the new operator calls the default constructor of the specific type and assigns the default value to the variable.
此调用后，该结构被认为已被明确赋值；也就是说该结构的所有成员均已初始化为各自的默认值。
A type-annotated variable assumes the default value for that type.
一个经类型批注的变量假定该类型的默认值。
A type-annotated variable assumes the default value for that type.
一个经类型批注的变量假定该类型的默认值。
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