Formatting your code in Eclipse is very useful and very easy, so I use it a lot. Just press CONTROL + SHIFT + F.
There's one problem and it's line length. By default a Java file can have in Eclipse only 80 characters. This is a very small number in the era of big computer monitors. To change this you must go to Window -> Preferences, choose Java -> Code Style -> Formatter.
There is formatting configuration. Standard Eclipse built-in configuration is only read-only, so click New and create your custom format using default Eclipse configuration.
You can see that you can change many things in this configuration, but right now we're interrested only in maximum line length. Goto Line Wrapping and set Maximum line width to your liking. 200 or 300 characters per line should be sufficient.
Now if you press CONTROL + SHIFT + F, Eclipse will use this new format.