Transferred from: http://blog.csdn.net/xiadasong007/archive/2009/11/11/4799715.aspx
Open Eclipse-Window, perferences
Find the Content Assist under Editor under Java, and in the options that appear on the right, there is an auto activation triggers for Java:
will see only one "." Exist. Indicates: Only input "." Then there will be code hints.
First, put the "." Enter a few random characters, such as "DSFD", and click "OK" at the bottom to save the settings.
Open the File-and Export of Eclipse, and in the window, expand general-and Perferences-->export
All and then click NEXT. Then click "Browse" to select any one of the paths, save the configuration file, click "Finish"
Use Notepad to open the configuration file you just saved (extension file name: *.EPF), press "CTRL + F", enter the "DSFD" you just set, and find
Just a string. Change "DSFD" to "abcdefghijklmnopqrstuvwxyz.", Save
Open the File-and Import of Eclipse, and in the open window, expand general--perferences, click Next, select the
Changed configuration file, Finish.
Setting method for "Go" Eclipse auto-completion