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1, remove the reference to the current class
Shortcut: Ctrl + the Shift + O
2, refers to the entire package is removed
In the Project Explorer, right-click the package name, select Source - Organize Imports , in fact, it is Ctrl + Shift + O
3, automatically remove references when saving codes
Windows—>Preferences—>Java—>Editor—>Save Actions
选择Perform the selected action on save，勾选Organize imports