Java Arrays deepHashCode() Method

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Description

The Java Arrays deepHashCode(Object[]) method returns a hash code based on the "deep contents" of the specified array.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).

Declaration

Following is the declaration for java.util.Arrays.deepHashCode() method

public static int deepHashCode(Object[] a)

Parameters

a − This is the array whose deep-content-based hash code to compute.

Return Value

This method returns a deep-content-based hash code for a.

Exception

• NA

Getting Deep Hashcode from an Array of Strings Example

The following example shows the usage of Java Arrays deepHashCode(Object[]) method. In this example, we've created one array of Strings and computed their hashcode using deepHashCode() method and printed

package com.tutorialspoint;

import java.util.Arrays;

public class ArrayDemo {
  public static void main(String[] args) {

      //initializing an string array
      String[] stringArr = { "tuts","point" };

      // deepHashCode for String array
      int retval = Arrays.deepHashCode(stringArr);

      // printing value
      System.out.println("The Hash Code of stringArr is:" + retval);
   }
} 

Output

Let us compile and run the above program, this will produce the following result −

The Hash Code of stringArr is:217575569

Getting Deep Hashcode from an Array of Integers Example

The following example shows the usage of Java Arrays deepHashCode(Object[]) method. In this example, we've created one array of Integers and computed their hashcode using deepHashCode() method and printed

package com.tutorialspoint;

import java.util.Arrays;

public class ArrayDemo {
  public static void main(String[] args) {

      //initializing an integer array
      Integer[] intArr = { 1, 2 };

      // deepHashCode for Integer array
      int retval = Arrays.deepHashCode(intArr);

      // printing value
      System.out.println("The Hash Code of intArr is:" + retval);
   }
} 

Output

Let us compile and run the above program, this will produce the following result −

The Hash Code of intArr is:994

Getting Deep Hashcode from an Array of Objects Example

The following example shows the usage of Java Arrays deepHashCode(Object[]) method. In this example, we've created one array of Student objects and computed their hashcode using deepHashCode() method and printed.

package com.tutorialspoint;

import java.util.Arrays;

public class ArrayDemo {
  public static void main(String[] args) {

      //initializing an Student array
      Student[] studentArr = { new Student(1, "Julie"), new Student(2, "Robert"), new Student(3, "Adam") };

      // deepHashCode for Student array
      int retval = Arrays.deepHashCode(studentArr);

      // printing value
      System.out.println("The Hash Code of studentArr is:" + retval);
   }
} 
class Student {
   int rollNo;
   String name;

   Student(int rollNo, String name){
      this.rollNo = rollNo;
      this.name = name;
   }

   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]";
   }
}

Output

Let us compile and run the above program, this will produce the following result −

The Hash Code of studentArr is:-1497234753