El método keySet() de la clase java.security.Provider se utiliza para devolver una vista Set no modificable de las claves de propiedad contenidas en este proveedor.
Sintaxis:
public Set keySet()
Valor devuelto: este método devuelve una vista establecida de las claves contenidas en este mapa.
A continuación se muestran los ejemplos para ilustrar el método keySet() :
Programa 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);
}
}
}
Producción:
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
Programa 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);
}
}
}
Producción:
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
Publicación traducida automáticamente
Artículo escrito por RohitPrasad3 y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA