Java program converts LinkedList to array, array to LinkedList

　 　 Java Comprehensive Examples

In this example, we will learn how to convert a LinkedList and an array to each other in Java.

Before learning this example, please make sure you have first accessed the following tutorials:

• Java LinkedList Class

• Java array

Example1: Convert LinkedList to an array

import java.util.LinkedList;
class Main {
　　public static void main(String[] args) {
　　　　LinkedList<String> languages = new LinkedList<>();
　　　　//Add elements to the list
　　　　languages.add("Java");
　　　　languages.add("Python");
　　　　languages.add("JavaScript");
　　　　System.out.println("LinkedList: "　+　languages);
　　　　//Create a new String type array
　　　　String[] arr = new String[languages.size()];
　　　　//Convert LinkedList to a string array
　　　　languages.toArray(arr);
　　　　System.out.print("Array: ");
　　　　for(String item:arr) {
　　　　　　System.out.print(item+", ");
　　　　}
　　}
}

Output Result

LinkedList: [Java, Python, JavaScript]
Array: Java, Python, JavaScript,

In the above example, we created a list named languages. Note this line,

languages.toArray(arr);

In this case, the toArray() method converts the languages list to an array and stores it in the string array arr.

Note: If no parameters are passed to the toArray() method, it will return an array of type Object.

Example2: Convert an array to a LinkedList

import java.util.Arrays;
import java.util.LinkedList;
class Main {
　　public static void main(String[] args) {
　　　　//Create an Array
　　　　String[] array = {"Java", "Python", "C"};
　　　　System.out.println("Array: "　+　Arrays.toString(array));
　　　　//Convert Array to List
　　　　LinkedList<String> languages = new LinkedList<>(Arrays.asList(array));
　　　　System.out.println("LinkedList: "　+　languages);
　　}
}

Output Result

Array: [Java, Python, C]
LinkedList: [Java, Python, C]

In the above example, we created a String type array. Note the expression

Arrays.asList(array)

Here, the asList() method of the Arrays class converts the specified array to a list.

Java Comprehensive Examples