Java Arrays - hashCode() Method
The java.util.Arrays.hashCode() method returns a hash code based on the contents of the specified array. For any two double arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b).
Syntax
public static int hashCode(double[] a)
Parameters
a |
Specify the array whose hash value to compute. |
Return Value
Returns a content-based hash code for the array.
Exception
NA.
Example:
In the example below, the java.util.Arrays.hashCode() method is used to check whether the two arrays of doubles are equal or not.
import java.util.*;
public class MyClass {
public static void main(String[] args) {
//creating three double arrays
double Arr1[] = {10.1, 5.2, 25.3};
double Arr2[] = {10.1, 5.2, 25.3};
double Arr3[] = {10.1, 20.2, 30.3};
//print the hash code of arrays
System.out.println("hashCode of Arr1: "+ Arrays.hashCode(Arr1));
System.out.println("hashCode of Arr2: "+ Arrays.hashCode(Arr2));
System.out.println("hashCode of Arr3: "+ Arrays.hashCode(Arr3));
//check Arr1 and Arr2 for equality
boolean check = (Arrays.hashCode(Arr1) == Arrays.hashCode(Arr2));
System.out.println("\nAre Arr1 and Arr2 equal?: "+ check);
//check Arr1 and Arr3 for equality
check = (Arrays.hashCode(Arr1) == Arrays.hashCode(Arr3));
System.out.println("Are Arr1 and Arr3 equal?: "+ check);
}
}
The output of the above code will be:
hashCode of Arr1: -1535839105 hashCode of Arr2: -1535839105 hashCode of Arr3: -2078084000 Are Arr1 and Arr2 equal?: true Are Arr1 and Arr3 equal?: false
❮ Java.util - Arrays
