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syntactic unit > keyword > abstract
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abstract comparison table
Subject have purpose is an instance of declare is a kind of is a subtopic of modify has definition
keyword   syntactic unit  A word that has special meaning in Java
abstract
  • to indicate that a class cannot be instantiated
  • or to indicate that a method has no implementation
keywordabstract method Methodsmethod, class, interfaceA keyword that means a class cannot be instantiated

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