GetAlgorithm Method in Java

The algorithm name for the parameter generator can be obtained using the method getAlgorithm() in the class java.security.AlgorithmParameterGenerator. This method requires no parameters and it returns the algorithm name in string form.

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 {
         AlgorithmParameterGenerator apGenerator = AlgorithmParameterGenerator.getInstance("DiffieHellman");
         apGenerator.init(1024);
         String algorithm = apGenerator.getAlgorithm();
         System.out.println("The Algorithm is: " + algorithm);
      } catch (NoSuchAlgorithmException e) {
         System.out.println("Error!!! NoSuchAlgorithmException");
      } catch (ProviderException e) {
         System.out.println("Error!!! ProviderException");
      }
   }
}

Output

The Algorithm is: DiffieHellman

Now let us understand the above program.

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

try {
   AlgorithmParameterGenerator apGenerator = AlgorithmParameterGenerator.getInstance("DiffieHellman");
   apGenerator.init(1024);
   String algorithm = apGenerator.getAlgorithm();
   System.out.println("The Algorithm is: " + algorithm);
} catch (NoSuchAlgorithmException e) {
   System.out.println("Error!!! NoSuchAlgorithmException");
} catch (ProviderException e) {
   System.out.println("Error!!! ProviderException");
}