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Can we convert a Java list to array?
The List provides two methods to convert a List into Array.
1. Use toArray() method without parameter.
Object[] toArray()
Returns
An array containing all of the elements in this list in proper sequence.
2. Use toArray() with array.
<T> T[] toArray(T[] a)
Parameters
a − The array into which the elements of this list are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.
Returns
An array containing the elements of this list.
Throws
ArrayStoreException − If the runtime type of the specified array is not a supertype of the runtime type of every element in this list.
NullPointerException − If the specified array is null.
Example
Following is the example showing the usage of toArray() methods −
package com.tutorialspoint;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class CollectionsDemo {
public static void main(String[] args) {
List<String> list = new ArrayList<>(Arrays.asList("A","B","C", "D"));
System.out.println("List: " + list);
Object[] items = list.toArray();
for (Object object : items) {
System.out.print(object + " ");
}
System.out.println();
String[] characters = list.toArray(new String[0]);
for (String string : characters) {
System.out.print(string + " ");
}
}
}Output
This will produce the following result −
List: [A, B, C, D] A B C D A B C D
Updated on: 09-May-2022
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