ctrl+shift+F : search in whole project
ctrl+hover : check the field info in brief
ctrl+Q : check the field info in detail
ctrl+P: show the parameter information
ctrl+W : select the sentence incrementally
ctrl+H : check the hierarchy of a class
ctrl+B : go to the declaration of a method
ctrl+U: go to the super method/class
ctrl+shift+H: method hierarchy
ctrl|+alt+H: call hierarchy
ctrl+shift+N : search for and open a class
alt+enter : smart suggestions
ctrl+space : smart completion
ctrl+Y : delete the current line
ctrl+F4: close the current tab
alt+Q: show the current class name
double+shift: search everywhere
ctrl+shift+F: find in path
ctrl+F9: compile make project (compile modified and dependent)
ctrl+shift+F9: compile selected file, package or module
shift+F9: debug
shift+F10: run
ctrl+shift+F10: run context configuration from editor
shift+F6: refactor -> rename
ctrl+J: insert template
ctrl+shift+A: find any action inside the IDE
ctrl+shift+Enter: Complete the code block automatically
ctrl+J: suggestions of code blocks
ctrl+H: Display the hierarchy of the Class
ctrl+alt+H: Display the usage of the method
ctrl + alt + V : repalce occruencies with a variable, extract a parameter to a local variable
ctrl+ shift + down_arrow: move the whole line down
shift + F10 : run test
ctrl + alt + N : inline the variable
ctrl + alt + C: make the variable a constant (public static final)
shift + F6 : Refactor the name of a variable in all places
ctrl + W : extend selection
ctrl + shift + W : shrink selection
ctrl + alt + I : Auto indent lines
ctrl + alt + M : extract a block of codes to a method
ctrl + alt + shift +T : Go to Refactor menu, could move methods/variables to a base super class
alt + Enter : Auto suggestions. Could create a field for a parameter in the constructor. Could create a new class under either main/test folder.
alt + Insert : Go to the Generate menu.
ctrl + alt + P : Extract the variable to be a parameter
ctrl + alt + F : Extract a local variable to be a field in the class
F6: could move a method to another class
ctrl + shift + J : Line Join
alt + shift + click : multi-cursor functions
ctrl + alt + O : Optimize imports
ctrl + O : select method to override
ctrl + alt + L: reformat code: auto indent whole file and optimize imports