Notice the Command Assistance area circled in red.
注意,命令帮助区域用红色圆圈标明。
Notice the Interfaces text area, in which you can enter any interface you want this class to implement.
注意在接口文本区域可以输入任何你希望该类实现的接口。
They can even become outdated if you don’t notice changes in the area.
如果你不注意更新这一领域的变化,你的知识也会变得过时没用。
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