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
  • F4-- 查看类体系
  • 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.