Java Provider keySet()用法及代碼示例

java.security.Provider類的keySet()方法用於返回此提供程序中包含的屬性鍵的不可修改的Set視圖。

用法:

public Set keySet()

返回值：此方法返回此映射中包含的鍵的設置視圖。

下麵是說明keySet()方法的示例：

示例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); 
        } 
    } 
}

輸出：

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

示例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); 
        } 
    } 
}

輸出：

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

相關用法

注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Provider keySet() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。