DigestOutputStream.toString() method in Java with Examples

Last Updated : 9 Jun, 2020
The toString() method of java.security.DigestOutputStream class used to provide the object of DigestOutputStream in string format. Syntax: 
public String toString()
Return Value: This method returns the object of DigestOutputStream in string format. Note: All the programs in this article won’t run on online IDE as no ‘name’ file exists. You can check this code on the Java compiler on your system. To check this code, create a file ‘name’ on your system. Below are the examples to illustrate the toString() method: Example 1: Java 
// Java program to demonstrate
// toString() method

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

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

        try {

            // creating the object of MessageDigest
            // and getting instance
            // By using getInstance() method
            MessageDigest sr
                = MessageDigest.getInstance("MD5");

            // creating and initializing
            // object of OutputStream
            OutputStream is
                = new FileOutputStream(
                    "f:/java/name.txt");

            // creating and initializing
            // object of DigestOutputStream
            DigestOutputStream di
                = new DigestOutputStream(is, sr);

            // getting the string
            // representation of DigestOutputStream
            // using toString() method
            String str = di.toString();

            // display the result
            System.out.println("Status : " + str);
        }

        catch (NoSuchAlgorithmException e) {

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

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

            System.out.println("Exception thrown : " + e);
        }
    }
}
Output: 
Status : [Digest Output Stream] MD5 Message Digest from SUN,
Example 2: Java 
// Java program to demonstrate
// toString() method

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

public class GFG {
    public static void main(String[] argv)
    {
        try {
            // creating the object of MessageDigest
            // and getting instance
            // By using getInstance() method
            MessageDigest sr
                = MessageDigest.getInstance("SHA-1");

            // creating and initializing
            // object of OutputStream
            OutputStream is
                = new FileOutputStream(
                    "f:/java/name.txt");

            // creating and initializing
            // object of DigestOutputStream
            DigestOutputStream di
                = new DigestOutputStream(is, sr);

            // getting the string representation
            // of DigestOutputStream
            // using toString() method
            String str = di.toString();

            // display the result
            System.out.println("Status : " + str);
        }

        catch (NoSuchAlgorithmException e) {

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

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

            System.out.println("Exception thrown : " + e);
        }
    }
}
Output: 
Status : [Digest Output Stream] SHA-1 Message Digest from SUN,
Reference: https://docs.oracle.com/javase/9/docs/api/java/security/DigestOutputStream.html#setMessageDigest-java.security.MessageDigest-
Comment

Explore