它同时支持数字和符号名称。
在查找的过程中需要使用导入的符号名称。
The symbolic name of the import is needed to perform the look-up.
这种方法符号名称被称作方法签名,为了便于重载,返回类型被省略。
This use of the method symbol name is referred to as the method signature and, for the purposes of overloading, the return type is ignored.
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