This article shows how to Add an element to an Array in a Java program. Since arrays in Java have a fixed size, adding a new element typically involves creating a larger array, copying the existing elements into it, and then appending the new element. Alternatively, you can use dynamic data structures like ArrayList for easier element addition.
Add Element Using a New Array
This program creates a larger array, copies existing elements into it, and appends the new element at the end.
package com.javacodepoint.array;
public class AddElement {
public static void main(String[] args) {
int[] arr = { 10, 20, 30, 40, 50 };
int element = 60; // Element to be added
// Create a new array of size n+1
int[] newArr = new int[arr.length + 1];
// Copy elements to the new array
for (int i = 0; i < arr.length; i++) {
newArr[i] = arr[i];
}
// Add the new element at the end
newArr[arr.length] = element;
// Print the new array
System.out.println("Array after adding an element:");
for (int num : newArr) {
System.out.print(num + " ");
}
}
}
OUTPUT:
Array after adding an element:
10 20 30 40 50 60
Add Element Using ArrayList
This program leverages Java’s ArrayList to dynamically add an element without manually resizing or copying data.
package com.javacodepoint.array;
import java.util.ArrayList;
public class AddElementUsingArrayList {
public static void main(String[] args) {
ArrayList<Integer> list = new ArrayList<>();
list.add(10);
list.add(20);
list.add(30);
list.add(40);
list.add(50);
// Add the new element
list.add(60);
// Print the updated list
System.out.println("ArrayList after adding an element: " + list);
}
}
OUTPUT:
ArrayList after adding an element: [10, 20, 30, 40, 50, 60]
Notes:
- Use the first approach if you need a fixed-size array.
- Use
ArrayListfor dynamic resizing and easier manipulation.
For a detailed guide on inserting an element at a specific position in an array, check out our article: Insert Element at Specific Position in Array.