Eclipse Mouse becomes cross type

In eclipse, the mouse suddenly becomes the cross form. The solution is to press:alt+shift+a

After investigation:

Eclipse shortcut key alt+shift+a is a box-selected code, with column editing function, only need to more than 3.5 of the version to use.

To use Eclipse's column editing function, only through the shortcut key alt+shift+a into the column editing mode, after the completion of the modification, and then press once alt+shift+a exit column editing mode;

You can also use Eclipse's icon to enter column editing mode, as shown in the red box :

　　

With the column editing feature, you can edit a piece of code:

For example, a piece of code indentation, just select the code block to press TAB.

Eclipse Mouse becomes cross type