Interview questions on java 8 Lambda Expression for experienced

 Part 2

Interview questions on Java 8 Lambda Expression for experienced covered in this post:

    Can you compare Inner classes and lambda expression?

	Inner class	Lambda Expression
1.	An inner class can have a name.	Lambda expression doesn’t have any name.
2.	An inner class can extend the abstract class.	Lambda expression cannot extend the abstract class.
3.	An inner class can extend the concrete class.	Lambda expression cannot extend the concrete class.
4.	An inner class can implement an interface that has multiple abstract methods.	Lambda expression can’t implement an interface that has multiple abstract methods.

  

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    What is the difference between Annonymous Inner class and Lambda Expression?

	Annonymous Inner class	Lambda Expression
1.	It is a class without a name.	It is a function without a name.
2.	An anonymous inner class can extend an abstract class or concrete class.	Lambda expression cannot extend an abstract class or concrete class.
3.	An anonymous inner class can implement an interface that has multiple abstract methods as well as a functional interface.	Lambda expression can implement only a functional interface.
4.	Inside the inner class, we can declare an instance variable.	Inside lambda expression, we can declare only local variables.
5.	An anonymous inner class can be instantiated.	Lambda expression cannot be instantiated.
6.	An anonymous interface is the best choice if we want to handle multiple methods.	Lambda expression is the best choice if we want to handle the interface with a single abstract method.
7.	Inside the Anonymous inner class, ‘this’ always refers current anonymous inner class object but not the outer class object.	Inside lambda expression, this always refers current outer class object.
8.	For an anonymous inner class at the time of compilation, a separated .class file will be generated.	For the lambda expression, separate .class file won’t be generated.

 

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