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

这个 价值观（） 方法 JAVA安全供应商 类用于返回此提供程序中包含的属性值的不可修改的集合视图。 语法：

null

public Collection<Object> values()

返回值： 此方法返回一个 值的集合视图 包含在这张地图上。下面是一些例子来说明 价值观（） 方法： 例1：

JAVA

                         // Java program to demonstrate                       
                         // values() 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                       
                                                 Collection<Object> value;                       
           
                                                 // getting unmodifiable Set view of the property value                       
                                                 value = provider.values();                       
           
                                                 // Creating the object of iterator to iterate set                       
                                                 Iterator iter = value.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 : SHA1withDSAValue is : SHA1withDSAValue is : SHA1withDSAValue is : SoftwareValue is : sun.security.provider.JavaKeyStore$DualFormatJKSValue is : SHAValue is : sun.security.provider.SHAValue is : sun.security.provider.JavaKeyStore$CaseExactJKSValue is : SoftwareValue is : sun.security.provider.DSA$SHA256withDSA

例2：

JAVA

                         // Java program to demonstrate                       
                         // values() 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                       
                                                 Collection<Object> value;                       
           
                                                 // getting unmodifiable Set view of the property value                       
                                                 value = provider.values();                       
           
                                                 // Creating the object of iterator to iterate set                       
                                                 Iterator iter = value.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 : SHA1withDSAValue is : SHA1withDSAValue is : SHA1withDSAValue is : SoftwareValue is : sun.security.provider.JavaKeyStore$DualFormatJKSValue is : SHAValue is : sun.security.provider.SHAValue is : sun.security.provider.JavaKeyStore$CaseExactJKSValue is : SoftwareValue is : sun.security.provider.DSA$SHA256withDSA

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