Reading view

There are new articles available, click to refresh the page.

Anonymous Inner class

Kalai Arasan

kalaiarasanpandi

7 July 2025 at 15:58

nameless or without any identity is called anonymous.

To override the method in outer class of the inner class object.

Different ways of implement Anonymous Inner classes :

using Concrete class
using Abstract class
using Interface
as method argument

Why we use

In java 8, Lambda expression and Functional interface can be understand by these concepts.

Example Anonymous Inner class Using Concrete class

I have a class named as parent and another class named as child. child extends the parent class. So parent class method can be access by child class depends on access modifier.

public class parent {
	public static void main(String[] args) {
		child a = new child();
		a.educate();
		a.leave();
		a.salary();
	}
	
	public void educate()	
	{
		System.out.println("education");
	}

	public void leave()
	{
		System.out.println("leave");
	}

	public void salary()
	{
		System.out.println("90000");
	}
}

class child extends parent
{
	public void salary()
	{
		System.out.println("10000");
	}
}

Output

education
leave
10000

if we remove salary method in child then the output is

education
leave
90000

Output remove method in child class

But the child need it own method definition go for anonymous inner class

code

parent a = new parent()
		{
			public void salary() {
				System.out.println(20000);
			}
		};

it is use to give a method for a single object. it must be end with ; (semicolon) like above code.

note : we can define method in inner class which are define in outer class.

Reference :

https://www.geeksforgeeks.org/java/anonymous-inner-class-java/