Java Program to double the size of an array

To double the size of an array, let us first create an array −

int arr[] = {5, 10, 15, 20, 25, 30, 35, 40, 45, 50};

Now, get the length of the above array −

int len = arr.length;

Double the size of the above array −

intnewArray[] = new int[len*2];

Now, newArray[] will be having twice the length of the array arr[].

Example

public class Demo {
   public static void main (String args[]) {
      int arr[] = {5, 10, 15, 20, 25, 30, 35, 40, 45, 50};
      System.out.println("Length of initial array = " + arr.length);
      int len = arr.length;
      int newArray[] = new int[len*2];
      System.arraycopy(arr, 0, newArray, 0, len);
      System.out.println("Length of new array = "+newArray.length);
   }
}

Output

Length of initial array = 10
Length of new array = 20

Karthikeya Boyini

Published on 26-Apr-2019 06:43:46

• Related Questions & Answers
• Java Program to extend the size of an Integer array
• Java program to reverse an array in groups of given size
• How to extend the size of an array in Java
• Java Program to implement Binary Search on double array
• Python program to reverse an array in groups of given size?
• Java Program to Get the Size of the Collection
• MongoDB query to count the size of an array distinctly?
• Java program to find the sum of elements of an array
• Java Program to convert Double into String using toString() method of Double class
• Java Program to calculate the time of sorting an array
• Get the size of an ArrayList in Java
• Java Program to convert String to Double
• How to define an array size in java without hardcoding?
• C++ Program to find size of int, float, double and char in Your System
• Java program to reverse an array