I have some legacy packages which doesn't have package-info.java. For some reason I need to create package-info.javas for them and I found the task really boring because there is no shortcut in eclipse for me to do that. I have to manually use the New > File procedure to create the file, then manually type in those package names.
Is there a shortcut in eclipse for such task?
It's counter-intuitive, but Eclipse's "New Java Package" dialog with its option to create a package-info.java works for existing packages, too.
Just right-click the existing package, select New > Package, and leave everything except the "Create package-info.java" checkbox unchanged.
This will produce a package-info.java that's pre-populated with the correct package name and an empty javadoc comment block (possibly with @author tags and similar default content depending on your settings). Works even if you don't have an existing file to copy from. Tested with Eclipse Oxygen.