Using bit tests, you can easily test for specific flags on a flag variable.
使用位测试，可以容易地测试标志变量上的特定标志。
Note the use of the w: prefix, which means that the flag variable is always local to the current window.
注意使用了w：作为前缀，这表示标记变量对于当前窗口来说始终是本地变量。
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.
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。
If the flag takes an argument, the argument is stored in the global variable optarg.
如果此标记带有参数，则参数存储在全局变量optarg中。
If the flag takes an argument, the argument is stored in the global variable optarg.
如果此标记带有参数，则参数存储在全局变量optarg中。
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