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