- Trending Categories
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Double brace initialization in Java
Double braces can be used to create and initialize objects in a single Java expression. See the example below −
Example
import java.util.ArrayList; import java.util.List; public class Tester{ public static void main(String args[]) { List<String> list = new ArrayList<>(); list.add("A"); list.add("B"); list.add("C"); list.add("D"); list.add("E"); list.add("F"); System.out.println(list); List<String> list1 = new ArrayList<String>() { { add("A"); add("B");add("C"); add("D");add("E");add("F"); } }; System.out.println(list1); } }
Output
[A, B, C, D, E, F] [A, B, C, D, E, F]
In order to initialize first list, we first declared it and then call its add() method multiple times to add elements to it.
In second case, we have created an anonymous class extending the ArrayList.
Using braces, we've provided an initializer block calling the add methods().
So by using braces, we can reduce the number of expressions required to create and initialize an object.
- Related Articles
- C# Equivalent to Java's Double Brace Initialization?
- Brace Expansion in C++
- A static initialization block in Java
- Initialization, declaration and assignment terms in Java
- A non-static initialization block in Java
- Can we declare final variables without initialization in java?
- Initialization of local variable in a conditional block in Java
- Double isInfinite() method in Java
- Double isNaN() method in Java
- Format double type in Java
- How to Convert Double to String to Double in Java?
- Convert double primitive type to a Double object in Java
- Convert double to string in Java
- Convert Double to Integer in Java
- Convert String to Double in Java

Advertisements