Java Signature toString() method

The string representation for the signature object can be obtained using the method getString() in the class java.security.Signature. This includes information such as the object state, algorithm name etc. The method getString() requires no parameters and it returns the provider for the signature object.

A program that demonstrates this is given as follows −

Example

 Live Demo

import java.security.*;
import java.util.*;
public class Demo {
   public static void main(String[] argv) {
      try {
         Signature signature = Signature.getInstance("SHA256withRSA");
         String str = signature.toString();
         System.out.println(str);
      } catch (NoSuchAlgorithmException e) {
         System.out.println("Error!!! NoSuchAlgorithmException");
      }
   }
}

Output

Signature object: SHA256withRSA

Now let us understand the above program.

The method toString() is used to obtain the string representation for the signature object. Then this string representation is displayed. If the algorithm name is wrong, then the exception NoSuchAlgorithmException is thrown. A code snippet that demonstrates is given as follows −

try {
   Signature signature = Signature.getInstance("SHA256withRSA");
   String str = signature.toString();
   System.out.println(str);
} catch (NoSuchAlgorithmException e) {
   System.out.println("Error!!! NoSuchAlgorithmException");
}