Eclipse has lots and lots of hotkeys, but for daily work you need only a small subset. This are the hotkeys I consider to be the most important time savers:
Moving around
- Ctrl+J – Incremental Search
- Ctrl+Shift+T – Search a type, with search on typing. You can use only the upcase letters (e.g. type “MIL” to find MouseInputListener)
- Ctrl+F6 – Switch between last used files
- F3 – Open declaration
- Ctrl+Alt+H – Open Call Hierarchy
Editing
- Ctrl+1 – Quick Fix: press while cursor is positioned at member variable, parameter, selection, warnings, errors, …
- Ctrl+Space – Context Assist: press after a ., or to use macros (for, while, sysout, …). Press in class-scope to automatically create method declarations.
- Ctrl+Shift+O – Organize Imports
- Ctrl+Shift+F – Reformat source
- Alt+Shift+T – Show Refactor Quick Menu
In case these hotkeys are not enough or you have forgotten which hotkey does what, you can always press Ctrl+Shift+L to get a nice list of all the hotkeys.