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syntactic unit > symbol > name > fully qualified name
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fully qualified name comparison table
Subject have syntax have example have be be the same as start with contain is a subtopic of is a kind of have convention write in
fully qualified class name 
java.lang.String 
first letter of each word capitalized by conventiontoo general or too specific  package namePackagesfully qualified name the singular by convention
fully qualified interface name   a keyword   Interfacesfully qualified name  
fully qualified method name
packageName.className.methodName
 java.lang.String.substring 
 the same as another method's name in the same class if they each have a different arrangement of parameter types   Packagesmethod name  
fully qualified name of a member of a package   a keywordthe pathname to the file containing the member of a package  Packagesfully qualified name  
fully qualified variable name 
  • loadFile
  • areaCode
  • quitGame
 case sensitive a letter, an underscore character (_) or a dollar sign ($)any combination of Unicode characters after the first characterVariables and Data Typesvariable nameit consists of several words joined together with the first letter of the variable name in lowercase, each successive word beginning with a capital letter and all other letters lowercase 

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