Java中的Provider keySet（）方法及其示例-yiteyi-C++库

这个 键集（） 方法 JAVA安全供应商 类用于返回此提供程序中包含的属性键的不可修改的集合视图。

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语法：

public Set keySet()

返回值： 此方法返回一个 设置键的视图 包含在这张地图上。

下面是一些例子来说明 键集（） 方法：

项目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 :  "                               );                   
                                         while                               (i >                               0                               ) {                   
                                         System.out.println(                               "Value is : "                               + iter.next());                   
                                         i--;                   
                                         }                   
                                         }                   
                             
                                         catch                               (NoSuchAlgorithmException e) {                   
                             
                                         System.out.println(                               "Exception thrown : "                               + e);                   
                                         }                   
                                         }                   
                     }                   

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

项目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 :  "                               );                   
                                         while                               (i >                               0                               ) {                   
                                         System.out.println(                               "Value is : "                               + iter.next());                   
                                         i--;                   
                                         }                   
                                         }                   
                             
                                         catch                               (NoSuchAlgorithmException e) {                   
                             
                                         System.out.println(                               "Exception thrown : "                               + e);                   
                                         }                   
                                         }                   
                     }                   

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

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