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What is composition in Java?

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Inheritance is an "is-a" relationship. Composition is a "has-a". You do composition by having an instance of another class C as a field of your class, instead of extending C . A good example where composition would've been a lot better than inheritance is java.util.Stack , which currently extends java.util.Vector .Mar 8, 2010 read more

Java Composition Benefits. Notice that above test program for composition in java is not affected by any change in the Job object. If you are looking for code reuse and the relationship between two classes is has-a then you should use composition rather than inheritance. read more

Composition is the design technique to implement has-a relationship in classes. We can use java inheritance or Object composition for code reuse. Java composition is achieved by using instance variables that refers to other objects. read more

Composition on the other end contains an instance of another class in your class establishes "Has A" relationship. Composition in java is is useful since it technically facilitates multiple inheritance. read more

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