What are different types of inner classes in Java?

What are types of inner class in Java?

There are basically four types of inner classes in java.

  • Nested Inner class.
  • Method Local inner classes.
  • Anonymous inner classes.
  • Static nested classes.

What are inner class types?

Types of Nested classes

Type Description
Anonymous Inner Class A class created for implementing an interface or extending class. The java compiler decides its name.
Local Inner Class A class was created within the method.
Static Nested Class A static class was created within the class.

What are the four types of nested classes in Java?

There are four types of inner classes:

  • Nested Inner Class.
  • Static Inner Class.
  • Method Local Inner Class.
  • Anonymous Inner Class.

What is an inner class and example in Java?

Java Member Inner class. A non-static class that is created inside a class but outside a method is called member inner class. It is also known as a regular inner class. It can be declared with access modifiers like public, default, private, and protected.

Can we override inner class?

No, you cannot override private methods in Java, private methods are non-virtual in Java and access differently than non-private one. Since method overriding can only be done on derived class and private methods are not accessible in a subclass, you just can not override them.

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Why do we use inner class?

Inner classes are a security mechanism in Java. We know a class cannot be associated with the access modifier private, but if we have the class as a member of other class, then the inner class can be made private. And this is also used to access the private members of a class.

Can inner class have main method?

main method in inner classes

Inside inner class we can’t declare static members. So that it is not possible to declare main() method inside non static inner class.

Can inner class have constructor?

5 Answers. You can observe the constructor chain for the inner class when you extend an inner class. so you can see that you are able to call the super constructor of your nested class passing to that constructor the MainClass , and calling . super on mainClass object instance.

Can a class be private?

No, we cannot declare a top-level class as private or protected. It can be either public or default (no modifier).

What are class level variables?

From Wikipedia, the free encyclopedia. In object-oriented programming with classes, a class variable is any variable declared with the static modifier of which a single copy exists, regardless of how many instances of the class exist.

What is static in Java?

In the Java programming language, the keyword static indicates that the particular member belongs to a type itself, rather than to an instance of that type. This means that only one instance of that static member is created which is shared across all instances of the class.

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