Custom Deep Copy Primitive Integer Array in Java

There are different methods to create copies of an array. Deep copy is considered as an expensive method when compared to shallow copying.

Following is a utility method used to copy an existing array into a new freshly created array in java.

package basics;

import java.util.Arrays;

public class ArrayUtility {
 
 static int[] copy( int[] input )
 {
     if ( input==null || input.length==0 )
         return null;
        
     int N = input.length;
     int[] copy = new int[N];
     for( int i = 0; i<N ; i++ )
         copy[i] = input[i];
  
     return copy;
 } 

 public static void main(String[] args) {
  
  int[] original = {22,55,66,11,32,56,67,89,95,10};
  
  int[] copyArray = copy( original );
  
  boolean result = Arrays.equals( original, copyArray );
  
  System.out.println( "Arrays are equal = "+result ); 

  System.out.print("\nOriginal Array = ");
  for( int i = 0; i< original.length; i++ )
       System.out.print( original[i]+" " );
  

  System.out.print("\nCopy Array = ");
  for (int i = 0; i < copyArray.length; i++)
    System.out.print(copyArray[i]+" ");
  
 }
}

Create a ArrayUtility.java file in your workspace.

When the main method inside the ArrayUtility class executed it is going to print :

Arrays are equal = true

Original Array = 22 55 66 11 32 56 67 89 95 10
Copy Array = 22 55 66 11 32 56 67 89 95 10