Arrays copyOfRange() method in java

by August 28, 2017 Java

Let’s learn Arrays copyOfRange() method in java.

Arrays copyOfRange() method in java

Arrays copyOfRange() method in java copies specified range of the original array into a new array.

Also read – java arrays

The initial index of the range (from) must lie between 0 and original.length, inclusive.

Syntax:

public static int[] copyOfRange(int[] original_array, int from_index, int to_index)

Throws:

ArrayIndexOutOfBoundsException – if from < 0 or from > original.length.

IllegalArgumentException – if from > to.

NullPointerException – if original is null.

Note:

  • initial index (from) should lie between 0 and original.length (inclusive).
  • value at original is placed to the initial element of copy. Except for from == original.length or from == to.
  • final index (to) should be greater than or equal to from. In some cases it could be greater than original.length in this case 0 is placed in all elements of copy whose index is >= original.length (from).
  • length of returned array will be to – from.

Also read – arrays.sort java

Let’s see arrays copyOfRange() method in java example and source code.

import java.util.Arrays;
public class ArrayCopyOfRangeDemo 
{
   public static void main(String[] args) 
   {
      int[] arrNumber = { 66, 67, 68, 69, 70, 71, 72 };
      System.out.println("Given array: ");
      for(int a = 0; a < arrNumber.length; a++) 
      {
         System.out.println(arrNumber[a]); 
      }
      int[] copyNum = Arrays.copyOfRange(arrNumber, 2, 6);
      System.out.println("----------------------");
      System.out.println("Between range 2 and 6: ");
      for(int a : copyNum)
      {
         System.out.print(a + " ");
      }
      System.out.println();
   }
}

Output:

Given array:
66
67
68
69
70
71

72

Between range 2 and 6:
68 69 70 71

Different variations of copyOfRange()

MethodDescription
static long[] copyOfRange(long[] original, int from, int to)Copies the specified range of the specified array into a new array.
static short[] copyOfRange( short[] original, int from, int to)Copies the specified range of the specified array into a new array.
static T[] copyOfRange(T[] original, int from, int to)Copies the specified range of the specified array into a new array.
static T[] copyOfRange(U[] original, int from, int to, Class newType)Copies the specified range of the specified array into a new array.
static int[] copyOfRange(int[] original, int from, int to)Copies the specified range of the specified array into a new array.
static float[] copyOfRange(float[] original, int from, int to)Copies the specified range of the specified array into a new array.
static double[] copyOfRange( double[] original, int from, int to)Copies the specified range of the specified array into a new array.
static char[] copyOfRange(char[] original, int from, int to)Copies the specified range of the specified array into a new array.
static byte[] copyOfRange(byte[] original, int from, int to)Copies the specified range of the specified array into a new array.
static boolean[] copyOfRange( boolean[] original, int from, int to)Copies the specified range of the specified array into a new array.

Arrays copyOfRange() long data type

Syntax

public static long[] copyOfRange(long[] original, int from, int to)

Example:

import java.util.Arrays;
public class ArrayCopyLong
{
   public static void main(String[] args)
   {
      long[] arrLong1 = new long[] {14, 23, 41};
      System.out.println("ARRAY COPY OF RANGE METHOD - LONG DATA TYPE");
      System.out.println("-------------------------------------------");
      System.out.println("Given array : ");
      for(int a = 0; a < arrLong1.length; a++)
      {
         System.out.println(arrLong1[a]);
      }
      // java copyofrange
      long[] arrLong2 = Arrays.copyOfRange(arrLong1, 2, 5);
      System.out.println("Copied array : ");
      for(int a = 0; a < arrLong2.length; a++)
      {
         System.out.println(arrLong2[a]);
      }
   }
}

Output:

Arrays copyOfRange() method in java

Arrays copyOfRange() short data type

Syntax

public static short[] copyOfRange(short[] original, int from, int to)

Also read – java array length

Here’s arrays copyofrange short data type example.

import java.util.Arrays;
public class ArrayCopyShort
{
   public static void main(String[] args)
   {
      short[] arrShort1 = new short[] {14, 23, 41};
      System.out.println("ARRAY COPY OF RANGE METHOD - SHORT DATA TYPE");
      System.out.println("--------------------------------------------");
      System.out.println("Given array : ");
      for(int a = 0; a < arrShort1.length; a++)
      {
         System.out.println(arrShort1[a]);
      }
      // java copyofrange
      short[] arrShort2 = Arrays.copyOfRange(arrShort1, 1, 3);
      System.out.println("Copied array : ");
      for(int a = 0; a < arrShort2.length; a++)
      {
         System.out.println(arrShort2[a]);
      }
   }
}

Output:

Arrays copyOfRange() method in java

Also read – java arraylist