I checked the preferences settings in my Eclipse, it\'s all set to default with sysout option on, but when I typed sysout in eclipse, it won\'t automatically go into S
You have to press Ctrl + Space for the sysout (or equivalently: syso) shortcut to work in Eclipse, as sysout is not part of Java in anyway, on the contrary: it's an abbreviation introduced in Eclipse that only works after you press Ctrl + Space and expands to System.out.println().
By the way, syserr (or equivalently: syse) will expand to System.err.println() after pressing Ctrl + Space.