How to implement a Java string hash algorithm?

In Java, we can use the hashCode() method to calculate the hash value of a string. This method returns an int value as the hash code of the string.

Here is an example code demonstrating how to calculate the hash value of a string.

public class StringHashAlgorithm {
    public static void main(String[] args) {
        String str = "Hello World";
        
        int hashCode = str.hashCode();
        
        System.out.println("Hash code of the string \"" + str + "\" is: " + hashCode);
    }
}

Running the above code will output the hash value of the string “Hello World”.

It should be noted that hash algorithms are irreversible, meaning it is impossible to retrieve the original string from its hash value. Therefore, they are commonly used in fields such as data validation, searching, and encryption in practical applications.