Relationships and differences between inheritance and composition in <java >

1 //The connection and difference between inheritance and composition in Java2 //This example is inherited3 4 classAnimal5 {6     Private voidBeat ()7     {8System.out.println ("Beating heart ...");9     }Ten      Public voidBreath () One     { A beat (); -System.out.println ("Inhale, breath, breathe ..."); -     } the } - //inherit animal, directly reuse the breath () method of the parent class - classBirdextendsAnimal - { +      Public voidFly () -     { +System.out.println ("I fly freely in the sky ..."); A     } at } - //inherit animal, direct reuse parent class breath () method - classWolfextendsAnimal - { -      Public voidRun () -     { inSystem.out.println ("I'm running fast on land ..."); -     } to } +  Public classinherittest - { the      Public Static voidMain (string[] args) *     { $Bird B =NewBird ();Panax Notoginseng B.breath (); - b.fly (); theWolf W =NewWolf (); + W.breath (); A W.run (); the     } +}

1 //The connection and difference between inheritance and composition in Java2 //This example is a combination3 classAnimal4 {5     Private voidBeat ()6     {7System.out.println ("Beating heart ...");8     }9      Public voidBreath ()Ten     { One beat (); ASystem.out.println ("Inhale, breath, breathe ..."); -     } - } the classBird - { -     //Combines the original parent class into a subclass as a combined part of the subclass. -     PrivateAnimal A; +      PublicBird (Animal a) -     { +          This. A =A; A     } at     //redefine one's own breath () method -      Public voidBreath () -     { -         //Direct multiplexing of the breath () method provided by the animal to implement the bird Breath () method - A.breath (); -     } in      Public voidFly () -     { toSystem.out.println ("I'm flying in the sky ..."); +     } - } the classWolf * { $     //Combines the original parent class into a subclass as a combined part of the subclass.Panax Notoginseng     PrivateAnimal A; -      PublicWolf (Animal a) the     { +          This. A =A; A     } the     //redefine one's own breath () method +      Public voidBreath () -     { $         //Direct multiplexing of the breath () method provided by the animal to implement the bird Breath () method $ A.breath (); -     } -      Public voidRun () the     { -System.out.println ("I'm running fast on land ...");Wuyi     } the } -  Wu  Public classcompositetest - { About      Public Static voidMain (string[] args) $     { -         //you need to display the object that you created the group at -Animal A =NewAnimal (); -Bird B =NewBird (a); A B.breath (); + b.fly (); the  -         //you need to display the object that you created the group at $Animal A2 =NewAnimal (); theWolf W =NewWolf (A2); the W.breath (); the W.run (); the     } -}

Relationships and differences between inheritance and composition in <java >