IntelliJ Idea

So far best IDE for Java

KeyMap

FYI... you can import a custom KeyMap as well, to keep consistent across IDEs/Languages

Predefined KeyMap Card
https://resources.jetbrains.com/storage/products/intellij-idea/docs/IntelliJIDEA_ReferenceCard.pdf
Also available under Help | Keymap Reference

Cmd + Ctrl + G     // Select all Occurrences
Cmd + Shift + L    // Reformat code
Cmd + Shift + A    // Find an action within IDE
Cmd + Shift + O    // Find a file
Cmd + O            // Find a Class
Cmd + E            // View recent

Plugins & Configurations

Key Promoter X
A plugin that shows the corresponding keyboard shortcut whenever a command is executed using the mouse and suggests to
create a shortcut for commands that are executed frequently.
https://plugins.jetbrains.com/plugin/9792-key-promoter-x

Find Plugin
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Markdown
AutoComplete

https://plugins.jetbrains.com/search?correctionAllowed=true&pr=idea_ce&search=&orderBy=&should_have_source=

Checkout

https://plugins.jetbrains.com/plugin/4486-sql-code-assistant
https://plugins.jetbrains.com/plugin/228-sql-query-plugin
https://plugins.jetbrains.com/plugin/9696-java-stream-debugger