AlgorithmParameters getInstance() method in Java with Examples

getInstance(String algorithm)

The getInstance() method of java.security.AlgorithmParameters class returns a object of AlgorithmParameters type that applys the assigned AlgorithmParameters algorithm.

Syntax:

public static AlgorithmParameters
  getInstance(String algorithm)
  throws NoSuchAlgorithmException

Parameters: This method seeks the standard Algorithm as a parameter.



Return Value: This method provides an new algorithm parameters object.

Exception: This method throws following exception:

  • NoSuchAlgorithmException:– if no provider is avaliable to support an algorithm parameters spi application for the particular algorithm.
  • NullPointerException:– if algorithm is null.

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

Example 1:

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// Java program to demonstrate
// getInstance() method
  
import java.security.*;
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv)
    {
        try {
            // creating the object of AlgorithmParameters
            // and getting instance
            // By usng getInstance() method
            AlgorithmParameters sr
                = AlgorithmParameters
                      .getInstance("DES");
  
            // getting the status
            // of AlgorithmParameters object
            String str = sr.toString();
  
            // printing the status
            System.out.println("Status : " + str);
        }
  
        catch (NoSuchAlgorithmException e) {
  
            System.out.println("Exception thrown : " + e);
        }
        catch (NullPointerException e) {
  
            System.out.println("Exception thrown : " + e);
        }
    }
}

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Output:


Status : null





Example 2: To show NoSuchAlgorithmException











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// Java program to demonstrate 


// getInstance() method 


  


import java.security.*; 


import java.util.*; 


  


public class GFG1 { 


    public static void main(String[] argv) 


    { 


  


        try { 


  


            // creating the object of AlgorithmParameters 


            // and getting instance 


            // By usng getInstance() method 


            AlgorithmParameters sr 


                = AlgorithmParameters.getInstance("GFG"); 


  


            // getting the status 


            // of AlgorithmParameters object 


            String str = sr.toString(); 


  


            // printing the status 


            System.out.println("Status : " + str); 


        } 


  


        catch (NoSuchAlgorithmException e) { 


  


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


        } 


        catch (NullPointerException e) { 


  


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


        } 


    } 


} 



















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Output:


Exception thrown :
 java.security.NoSuchAlgorithmException:
 GFG AlgorithmParameters not available





 getInstance(String algorithm, Provider provider)


The getInstance() method of java.security.AlgorithmParameters class returns a object of AlgorithmParameters type that applys the assigned algorithmParameters algorithm and assigned provider object.


Syntax:


public static AlgorithmParameters
  getInstance(String algorithm,  Provider provider)
  throws NoSuchAlgorithmException


Parameters: This method seeks the following arguments as a parameters:

          
          
          
          

            

    

  • algorithm: which is the name of the algorithm specified.
    • 

  • provider which is the name of the provider specified
    • 



Return Value: This method provides an new algorithm parameters object.


Exception: This method throws following exceptions:


    

  • NoSuchAlgorithmException: if no provider is avaliable to support an algorithm parameters spi application for the particular algorithm.
    • 

  • IllegalArgumentException: if the provider is null.
    • 

  • NullPointerException: if algorithm is null
    • 



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


Example 1:











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// Java program to demonstrate 


// getInstance() method 


  


import java.security.*; 


import java.util.*; 


  


public class GFG1 { 


    public static void main(String[] argv) 


    { 


        try { 


            // creating AlgorithmParameterGenerator object 


            // and getting instance 


            // By usng getInstance() method 


            AlgorithmParameterGenerator sr 


                = AlgorithmParameterGenerator 


                      .getInstance("DiffieHellman"); 


  


            // creating Provider object 


            Provider pd = sr.getProvider(); 


  


            // getting algorithm name 


            // by using getAlgorithm() mathod 


            String algo = sr.getAlgorithm(); 


  


            // creating AlgorithmParameterGenerator object 


            // and getting instance 


            // By usng getInstance() method 


            AlgorithmParameterGenerator sr1 


                = AlgorithmParameterGenerator 


                      .getInstance(algo, pd); 


  


            // getting the status of 


            // AlgorithmParameterGenerator object 


            String str = sr1.toString(); 


  


            // printing the status 


            System.out.println("Status : " + str); 


        } 


  


        catch (NoSuchAlgorithmException e) { 


  


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


        } 


        catch (IllegalArgumentException e) { 


  


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


        } 


    } 


} 



















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Output:


Status : java.security.AlgorithmParameterGenerator@63947c6b





Example 2: To show NoSuchAlgorithmException











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                                    code
                                




















// Java program to demonstrate 


// getInstance() method 


  


import java.security.*; 


import java.util.*; 


  


public class GFG1 { 


    public static void main(String[] argv) 


    { 


        try { 


            // creating AlgorithmParameterGenerator object 


            // and getting instance 


            // By usng getInstance() method 


            AlgorithmParameterGenerator sr 


                = AlgorithmParameterGenerator 


                      .getInstance("DSA"); 


  


            // creating Provider object 


            Provider pd = sr.getProvider(); 


  


            // getting algorithm name 


            // by using getAlgorithm() mathod 


            String algo = sr.getAlgorithm(); 


  


            // creating AlgorithmParameterGenerator object 


            // and getting instance 


            // By usng getInstance() method 


            AlgorithmParameterGenerator sr1 


                = AlgorithmParameterGenerator 


                      .getInstance("GFG", pd); 


  


            // getting the status of 


            // AlgorithmParameterGenerator object 


            String str = sr1.toString(); 


  


            // printing the status 


            System.out.println("Status : " + str); 


        } 


  


        catch (NoSuchAlgorithmException e) { 


  


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


        } 


        catch (IllegalArgumentException e) { 


  


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


        } 


    } 


} 



















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Output:


Exception thrown :
 java.security.NoSuchAlgorithmException:
 no such algorithm: GFG for provider SUN





Reference: https://docs.oracle.com/javase/9/docs/api/java/security/AlgorithmParameters.html



          
          
          
          

            

    

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