关闭输入流。
最后，关闭输入流，清空输出流，如果输出流是管道，则用pclose函数关闭它。
Finally, close the input stream, flush the output stream, and if it was a pipe, close it with the pclose function.
在加载properties对象之后，关闭输入流，然后设置布尔型标志变量(init)值为true，确定AddressStore对象已经被初始化。
After loading the Properties object, you close the input stream, and then set your Boolean flag variable (init) value to true, demarcating that the AddressStore object has been initialized.
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