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Q31. Difference between Composition and Inheritance ?

Ans. Inheritance means a object inheriting reusable properties of the base class. Compositions means that an abject holds other objects.

In Inheritance there is only one object in memory ( derived object ) whereas in Composition , parent object holds references of all composed objects.

From Design perspective - Inheritance is "is a" relationship among objects whereas Composition is "has a" relationship among objects.

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Related Questions

What are the difference between composition and inheritance in Java?

Explain OOPs

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Explain OOPs Principles

or

Explain OOPs Concepts

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Explain OOPs features

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Tell me something about OOPs

What is the difference between Encapsulation and Abstraction?

What are points to consider in terms of access modifier when we are overriding any method?

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Difference between Overloading and Overriding ?

Can you give a real world example of Encapsulation and Abstraction ?

Why every object constructor automatically call super() in Object before its own constructors?

How compiler handles the exceptions in overriding ?

Q32. Difference between PATH and CLASSPATH ?

Operating System

Ans. PATH is the variable that holds the directories for the OS to look for executables. CLASSPATH is the variable that holds the directories for JVM to look for .class files ( Byte Code ).

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How to display and set the Class path in Unix ?

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Which of the following is a canonical path ?

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In this url

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What is protocol , domain , path and query param ?

Q33. Which are the sorted collections ?

Core Java

Ans. TreeSet and TreeMap

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Difference beween HashSet and TreeSet ?

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