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Provider keySet() method in Java with Examples

Last Updated : 06 Dec, 2018
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The keySet() method of java.security.Provider class is used to return an unmodifiable Set view of the property keys contained in this provider.

Syntax:

public Set keySet()

Return Value: This method returns a set view of the keys contained in this map.

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

Program 1:




// Java program to demonstrate
// keySet() method
  
import java.security.*;
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv)
    {
        // Declaring int value i
        int i = 10;
  
        try {
            // creating the object of SecureRandom
            SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
  
            // getting the Provider of the SecureRandom sr
            // by using method getProvider()
            Provider provider = sr.getProvider();
  
            // Declaring the variable of set<Map> type
            Set<Object> keyset;
  
            // getting unmodifiable Set view of the keyset
            keyset = provider.keySet();
  
            // Creating the object of iterator to iterate set
            Iterator iter = keyset.iterator();
  
            // printing the set elements
            System.out.println("unmodifiable Set view : \n ");
            while (i > 0) {
                System.out.println("Value is : " + iter.next());
                i--;
            }
        }
  
        catch (NoSuchAlgorithmException e) {
  
            System.out.println("Exception thrown : " + e);
        }
    }
}


Output:

unmodifiable Set view : 
 
Value is : Alg.Alias.Signature.SHA1/DSA
Value is : Alg.Alias.Signature.1.2.840.10040.4.3
Value is : Alg.Alias.Signature.DSS
Value is : SecureRandom.SHA1PRNG ImplementedIn
Value is : KeyStore.JKS
Value is : Alg.Alias.MessageDigest.SHA-1
Value is : MessageDigest.SHA
Value is : KeyStore.CaseExactJKS
Value is : CertStore.com.sun.security.IndexedCollection ImplementedIn
Value is : Signature.SHA256withDSA

Program 2:




// Java program to demonstrate
// keySet() method
  
import java.security.*;
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv)
    {
        // Declaring int value i
        int i = 10;
  
        try {
            // creating the object of Signature
            Signature sr = Signature.getInstance("SHA1withDSA");
  
            // getting the Provider of the  Signature sr
            // by using method getProvider()
            Provider provider = sr.getProvider();
  
            // Declaring the variable of set<Map> type
            Set<Object> keyset;
  
            // getting unmodifiable Set view of the keyset
            keyset = provider.keySet();
  
            // Creating the object of iterator to iterate set
            Iterator iter = keyset.iterator();
  
            // printing the set elements
            System.out.println("unmodifiable Set view : \n ");
            while (i > 0) {
                System.out.println("Value is : " + iter.next());
                i--;
            }
        }
  
        catch (NoSuchAlgorithmException e) {
  
            System.out.println("Exception thrown : " + e);
        }
    }
}


Output:

unmodifiable Set view : 
 
Value is : Alg.Alias.Signature.SHA1/DSA
Value is : Alg.Alias.Signature.1.2.840.10040.4.3
Value is : Alg.Alias.Signature.DSS
Value is : SecureRandom.SHA1PRNG ImplementedIn
Value is : KeyStore.JKS
Value is : Alg.Alias.MessageDigest.SHA-1
Value is : MessageDigest.SHA
Value is : KeyStore.CaseExactJKS
Value is : CertStore.com.sun.security.IndexedCollection ImplementedIn
Value is : Signature.SHA256withDSA


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