Java中的提供者 keySet() 方法及示例
Java.security.Provider类的keySet()方法用于返回此提供程序中包含的属性键的不可修改的 Set 视图。
句法:
public Set keySet()
返回值:此方法返回此映射中包含的键的集合视图。
以下是说明keySet()方法的示例:
方案一:
// 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
输出:
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
方案二:
// 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
输出:
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