可以使用类java.security.Provider中的elements()方法获取哈希表中值的枚举。此方法不需要任何参数，它返回哈希表中值的枚举。

演示此的程序如下所示-

示例import java.security.*;

import java.util.*;

public class Demo {

public static void main(String[] argv) {

try {

SecureRandom sRandom = SecureRandom.getInstance("SHA1PRNG");

Provider p = sRandom.getProvider();

Enumeration enumeration;

enumeration = p.elements();

System.out.println("The Enumeration of the values is: \n");

while (enumeration.hasMoreElements()) {

System.out.println(enumeration.nextElement());

}

} catch (NoSuchAlgorithmException e) {

System.out.println("Error!!! NoSuchAlgorithmException");

}

}

}

输出结果The Enumeration of the values is:

SHA1withDSA

SHA1withDSA

SHA1withDSA

Software

sun.security.provider.JavaKeyStore$DualFormatJKS

SHA

sun.security.provider.SHA

sun.security.provider.JavaKeyStore$CaseExactJKS

Software

sun.security.provider.DSA$SHA256withDSA

SHA

SHA1withDSA

Software

Software

Software

sun.security.provider.DSA$RawDSA

X.509

java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey

sun.security.provider.certpath.IndexedCollectionCertStore

sun.security.provider.Sun

SHA

SHA1withDSA

sun.security.provider.DomainKeyStore$DKS

Software

SHA256withDSA

SHA224withDSA

1024

1024

Software

sun.security.provider.DSAKeyFactory

sun.security.provider.ConfigFile$Spi

SHA1withDSA

SHA-224

DSA

Software

SHA-512

SHA-384

SHA-256

NONEwithDSA

SUN

DSA

RFC3280

sun.security.provider.PolicySpiFile

2048

DSA

DSA

SHA1withDSA

DSA

sun.security.provider.SHA5$SHA384

sun.security.provider.SHA2$SHA224

Software

sun.security.provider.DSAParameterGenerator

java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey

sun.security.provider.NativePRNG$Blocking

sun.security.provider.SHA5$SHA512

DSA

sun.security.provider.certpath.SunCertPathBuilder

SHA1withDSA

SHA-224

Software

SHA-512

1.8

SHA-384

2048

SHA-256

sun.security.provider.DSAParameters

java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey

sun.security.provider.certpath.CollectionCertStore

Software

sun.security.provider.NativePRNG$NonBlocking

2048

sun.security.provider.certpath.ldap.LDAPCertStore

sun.security.provider.X509Factory

SHA256withDSA

SHA224withDSA

sun.security.provider.NativePRNG

RFC2587

Software

Software

RFC3280

Software

sun.security.provider.DSA$SHA224withDSA

SHA1withDSA

sun.security.provider.certpath.PKIXCertPathValidator

SHA

2048

sun.security.provider.SecureRandom

sun.security.provider.DSA$SHA1withDSA

DSA

Software

sun.security.provider.DSAKeyPairGenerator

SUN (DSA key/parameter generation; DSA signing; SHA-1, MD5 digests; SecureRandom; X.509 certificates; JKS & DKS keystores; PKIX CertPathValidator; PKIX CertPathBuilder; LDAP, Collection CertStores, JavaPolicy Policy; JavaLoginConfig Configuration)

DSA

SHA1withDSA

sun.security.provider.MD5

SHA1withDSA

sun.security.provider.SHA2$SHA256

DSA

java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey

sun.security.provider.MD2