IDEA 各个图标含义，C图标、I图标、m图标、f图标

常见的图标含义

Icon	Description
	Class
	Abstract class
	Groovy class
	Annotation
	Enumeration
	Exception
	Final Java class
	Interface
	Java class that contains declaration of the `main()` method.
	Test case
	Java class located out of the Sources root.
	Java class excluded from compilation.
	PHP trait
	PHP test
	Method
	Abstract method
	Field
	Variable
	Property
	Parameter
	Element
	Directory
	Module
	Group of modules
	Package
	Sources root
	Test root
	Excluded root
	Resources
	Test resources
	Generated sources root
	Generated test sources root
Visibility modifiers
	Read-only class, for example from a jar of an external library.
	private
	protected
	package protected
	static
	public
Bookmarks
	Anonymous bookmark – a check sign bookmark. Bookmarks are used for quick navigation within a file or across the entire project.
	Lettered mnemonic bookmark – a letter in the interval from A to Z.
	Numbered mnemonic bookmark – a number in the interval from 0 to 9.