Inner classes

Inner classes Tutorial Java Questions Answers

Inner classes Tutorial Java 1. What is inner class in Java? Explain with example? 2. What is nested class in Java? Explain clearly? A class declared within another class is known as inner class or nested class.

In the above code, Demo is known as outer class and Test…

Class inside Interface

Note: It is advised to read the basics and types of inner classes before proceeding further. The use of inner class in interface is, we can write default implementation for interface methods. In other words we can use interface as abstract class. Another use of creating a class inside an…

Interface inside Interface

Note: It is advised to read the basics and types of inner classes before proceeding further. A nested interface is just an interface but declared within another interface or even a class. A top-level interface is that one which is not nested. Nested interfaces are useful to group all the…

Nested Interfaces

Like a class you have seen, an interface can be nested within a) a class or b) another interface. That is, an interface can be declared inside a class body or interface body. That is, an interface can declare within it, classes, interfaces, instance variables and abstract methods. Let us…

Static Nested Classes

Restriction on Static Nested Classes static keyword can be applied on classes and interfaces only when they are nested. Top-level classes and interfaces cannot be static. This is the second variation of the total six discussed in this series. Note: It is advised to read the basics and types of…

Nested Classes Java

JDK 1.1 introduced a new type of classes known as inner classes. All the classes you have done so far are known as top-level classes. A class written inside another class is known as "inner class" or "nested class". That is, an inner class is enclosed within another class. Inner…