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📜  Java中的 Provider values() 方法及示例

📅  最后修改于: 2022-05-13 01:54:23.732000             🧑  作者: Mango

Java中的 Provider values() 方法及示例

Java.security.Provider类的values()方法用于返回此提供程序中包含的属性值的不可修改的 Collection 视图。
句法： 

public Collection values()
返回值：此方法返回此映射中包含的值的集合视图。
以下是说明values()方法的示例：
示例 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 type
            Collection 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 : \n ");
            while (i > 0) {
                System.out.println("Value is : " + iter.next());
                i--;
            }
        }
 
        catch (NoSuchAlgorithmException e) {
 
            System.out.println("Exception thrown : " + e);
        }
    }
}
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 type
            Collection 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 : \n ");
            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 : SHA1withDSA
Value is : SHA1withDSA
Value is : SHA1withDSA
Value is : Software
Value is : sun.security.provider.JavaKeyStore$DualFormatJKS
Value is : SHA
Value is : sun.security.provider.SHA
Value is : sun.security.provider.JavaKeyStore$CaseExactJKS
Value is : Software
Value is : sun.security.provider.DSA$SHA256withDSA
示例 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 type
            Collection 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 : \n ");
            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 : SHA1withDSA
Value is : SHA1withDSA
Value is : SHA1withDSA
Value is : Software
Value is : sun.security.provider.JavaKeyStore$DualFormatJKS
Value is : SHA
Value is : sun.security.provider.SHA
Value is : sun.security.provider.JavaKeyStore$CaseExactJKS
Value is : Software
Value is : sun.security.provider.DSA$SHA256withDSA