Eclipse Debug Mouse to display variable values

When debugging in Eclipse, the mouse moves to the variable does not display the value, this originally oneself also encountered, did not notice, anyway uses ctrl+shift+i well, also can, just looked up, solves the method as follows:

Window->preferences->java->editor->hovers [Variable Values] will be selected, if the first [Combined Hover] has been checked, then remove this tick, tick [Variable Values]. If not, you can only use Ctrl+shift+i shortcut keys.

Today, the students encountered a problem when using eclipse, to help them solve the following, organized as follows:
Problem Description: Eclipse in debug mode does not automatically display the value of a variable when the mouse moves over it
Solution: Click Eclipse's window->preferences->java->editor->hovers, tick variable Values, (if combined hover has selected, Cancel it), then click Apply, last click OK (e.g.).

Eclipse Debug Mouse to display variable values