In this section, we will learn what the String hashCode() method is and how to use it in Java.

What is Java String hashCode() Method?

The `hashCode()` method is used to get the hash code of a string value.

Java hashCode() Method Syntax:

public int hashCode()

hashCode() Method Parameters:

The method does not take an argument.

hashCode() Method Return Value:

The return value of this method is an integer value, which is the hash code of the target string value.

Example: using String hashCode() method

public class Simple {

    public static void main(String[] args)  {
        String s1 = "BE KING TO ONE ANOTHER";
        System.out.println(s1.hashCode());
    }
}

Output:

-1373947600

The formula that is used to get the hash code of a String is as follow:

s[0]*31^(n – 1) + s[1]*31^(n – 2) + … + s[n – 1]

• The `s[i]` is the `i`th character of the string.
• The `n` is the length of the string.

The ^ indicates exponentiation.