MessageDigest toString() method in Java with Examples

The toString() method of java.security.MessageDigest class is used to provide the object of message digest in string format.

Syntax:

public String toString()

Return Value: This method returns the object of message digest in string format.

Below are the examples to illustrate the toString() method:

Example 1:

// Java program to demonstrate
// toString() method

import java.security.*;
import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
    {
        try {

            // creating object of MessageDigest
            MessageDigest msd1
                = MessageDigest.getInstance("MD5");

            // getting the string value of msd1
            // using toString() method
            String nv = msd1.toString();

            // display the result
            System.out.println("MessageDigest : "
                               + nv);
        }

        catch (NoSuchAlgorithmException e) {

            System.out.println("Exception thrown : "
                               + e);
        }
        catch (ProviderException e) {

            System.out.println("Exception thrown : "
                               + e);
        }
    }
}

Output:

MessageDigest : MD5 Message Digest from SUN, <initialized>

Example 2:

// Java program to demonstrate
// toString() method

import java.security.*;
import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
    {
        try {

            // creating object of MessageDigest
            MessageDigest msd1
                = MessageDigest.getInstance("SHA-256");

            // getting the string value of msd1
            // using toString() method
            String nv = msd1.toString();

            // display the result
            System.out.println("MessageDigest : " + nv);
        }

        catch (NoSuchAlgorithmException e) {

            System.out.println("Exception thrown : " + e);
        }
        catch (ProviderException e) {

            System.out.println("Exception thrown : " + e);
        }
    }
}

Output:

MessageDigest : SHA-256 Message Digest from SUN, <initialized>

Reference: https://docs.oracle.com/javase/9/docs/api/java/security/MessageDigest.html#toString–