Latest Java Aptitude Question SOLUTION: What is the difference between an Abstract class and Interface?

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(#M40018791) JAVA question JAVA QUESTIONS Keep an EYE

What is the difference between an
Abstract class and Interface?

Asked In Java (11 years ago)

Unsolved Read Solution (7)

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Vaishali  (9 years ago)

Abstract class can contain both abstract methods and concrete methods whereas in interfaces it contains only abstract things

Is this solution Helpfull? Yes (2) | No (1)  

Srinivasan K.G  (9 years ago)

Abstract Class Hides 70% but Interface Hides 100% abstaction in java programming

Is this solution Helpfull? Yes (1) | No (2)  

srivallika  (9 years ago)

Abstract class can have constructors but the interface does not have constructors

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Ramanjaneyulu  (8 years ago)

Abstract Interface
1.Abstract having both abstract methods 1.Interface have only abstract methods
and Concrete (implementation ) methods.
2.No need to implement all abstract methods 2.Must and should be implement all methods in it's
in it's sub classes. sub classes.

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Shikha mittal  (8 years ago)

we use the abstract class by extend keyword it means we include that whole class in our derived class just like a copy concept but in case of interface we implement it. so whenever we perform any changes in declaration part of abstract class then at each place we have to modify it but in case of interface if we change in declaration of interface then it will automatically update by not producing any error.

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Arnab Roy  (8 years ago)

When we don't know about implementation just we have required specification then we will go for Inteface . When we need to partial implementation we will go for Abstract class.

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Indira Roy  (8 years ago)

1. Abstract class is used when partial information is known about its implementation. But interfaces are used when we do not know anything about its implementation and only some requirement specifications have been given to us.
2. Interfaces are purely 100% abstract as it contains only abstract methods . But abstract class are not purely 100 % abstract as within abstract class we have concrete as well as abstract methods.
3. In interfaces it is mandatory that all methods should be public and variables should be public final static. However there are no such restrictions in Abstract classes

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