Program
import java.util.Arrays;
public class ArrayDeepHashCode
{
public static void main(String args[])
{
int[][] array1 = {{ 8, 7, 4 }, { 3, 6, 5 },{ 0, 2, 1 } };
int[][] array2 = {{ 8, 4, 0 }, { 6, 7, 5 }, { 3, 2, 1 } };
System.out.println("Hash array1 " + Arrays.deepHashCode(array1));
System.out.println("Hash array2 " + Arrays.deepHashCode(array2));
}
}Output
Hash array1 37308160 Hash array2 37308160
Description
public static int deepHashCode​(Object[] a)
Returns a hash code based on the “deep contents” of the specified array. If the array contains other arrays as elements, the hash code is based on their contents and so on, ad infinitum. It is therefore unacceptable to invoke this method on an array that contains itself as an element, either directly or indirectly through one or more levels of arrays. The behavior of such an invocation is undefined.
For any two arrays a and b such that Arrays.deepEquals(a, b), it is also the case that Arrays.deepHashCode(a) == Arrays.deepHashCode(b).
The computation of the value returned by this method is similar to that of the value returned by List.hashCode() on a list containing the same elements as a in the same order, with one difference: If an element e of a is itself an array, its hash code is computed not by calling e.hashCode(), but as by calling the appropriate overloading of Arrays.hashCode(e) if e is an array of a primitive type, or as by calling Arrays.deepHashCode(e) recursively if e is an array of a reference type. If a is null, this method returns 0.
Parameters:
a – the array whose deep-content-based hash code to compute
Returns:
a deep-content-based hash code for a
Since:
1.5
