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Workaround:
When using eclipse, when you move the code with the mouse, especially when the mouse moves to the method name, it will automatically pop up a message bar near the mouse, which says the method is defined in which class, and the type of the method, comments.
Open eclipse today to find the mouse hover over a system class will not pop up these hints, and give the following tips:
Note:this element have no attached source and the Javadoc could not being found in the attached Javadoc
How to solve this problem?
In the main menu bar, select "Window"--"Preferences" submenu;
In "General"--"Editors"---> "File associations";
In the right "File types" point "Add ..." button in the Pop-up dialog box, enter the *.doc suffix, click OK.
Of course, if some friends have a sudden pop-up window interferes with the line of sight also affect the idea, the closing method is as follows:
Window->preferences (Preferences)->java->editor (editor)->hovers (hover hint) cancels [Combined Hover] (combined hover hint).
Java hint----This element have no attached source and the Javadoc could not being found in the attached Javadoc