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Program to convert Array to List in Java

Sun Jul 25 2021 17:17:39 GMT+0000 (Coordinated Universal Time)
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#java_array #array #list #java # Java collections example, #Java programming tutorial, #how to use Arrays.asList, #Java list example

Program to Convert Array to List in Java

If you’re working with Java, you’ve likely encountered arrays and lists as essential tools for storing and manipulating data. This article will explore how to convert an array to a list in Java, along with a clear explanation of arrays and lists, and why they’re so useful. By using this detailed guide, you’ll gain insights into leveraging these data structures effectively.


What is an Array in Java?

An array in Java is a container object that holds a fixed number of elements of the same type. Once created, the length of the array cannot be changed, making arrays a static data structure. Arrays are often used when the size of the data is known in advance. Here's an example:

int[] numbers = {10, 20, 30, 40, 50};

Key Characteristics of an Array:

  • Fixed size: The length of the array is established when it is created.
  • Contiguous memory allocation for efficient access.
  • Can store primitives and objects.

To learn more, check out the official Java Array Documentation.


What is a List in Java?

A List in Java is part of the Collection Framework and represents an ordered collection (also known as a sequence). Unlike arrays, lists are dynamic, allowing the insertion, deletion, and retrieval of elements in a flexible manner. You can also search for elements based on their index position.

Key Characteristics of a List:

  • Dynamic resizing: You can increase or decrease its size at runtime.
  • Elements can be accessed using their index.
  • Supports various implementations such as ArrayList, LinkedList, and more.

To dive deeper, refer to the official Java List Documentation.


How to Convert an Array to a List in Java?

Java makes it easy to convert an array to a list using the Arrays.asList() method. Here’s a simple example:

import java.util.*;
public class StringArrayTest {
    public static void main(String args[]) {
        String[] words = {"ace", "boom", "crew", "dog", "eon"};
        
        // Convert Array to List
        List<String> wordList = Arrays.asList(words);
        
        // Print elements of the List
        for (String e : wordList) {
            System.out.println(e);
        }
    }
}

Explanation of the Code:

  1. An array of strings words is created.
  2. The Arrays.asList() method is used to convert the array into a list.
  3. A for-each loop is used to print each element of the list.

Advantages of Converting an Array to a List

  • Dynamic Nature: Lists can grow or shrink as needed, unlike arrays.
  • Enhanced Operations: Lists offer methods such as add(), remove(), and contains() for efficient data handling.
  • Easy Integration: Lists are part of the Collection Framework, making them compatible with other utilities in Java.

Conclusion

In this article, we’ve explored how to convert an array to a list in Java using the Arrays.asList() method. Additionally, we’ve covered the fundamental differences between arrays and lists and their respective advantages.

By leveraging the power of lists, you can write more flexible and efficient Java programs.

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