sout: System.out.println
psvm: the main function
fori: simple for loop
Collection .for: Enhanced for loop
---------------------------------- commonly used shortcuts ------------ ------------
Alt + Enter: one size fits all (the red line to press it)
Ctrl + Alt + L: Format Code
Ctrl + H: Check structural relationships
Ctrl + N: Quick Search
Ctrl + 0: Rapid override the parent class method
Ctrl + x: delete a line of code
Ctrl + F12: pop-up page outline
Ctrl + shift + /: multiline comments or comments untie
Ctrl + /: single-line comment or unwound Notes