Java 中的 Provider values() 方法
可以通过使用 java.security.Provider 类中的 values() 方法获取 Provider 中的属性值,该方法会返回一个不可修改的 Collection 视图。此方法不需要参数,它会返回属性值的不可修改的 Collection 视图。
演示此方法的程序如下 −
示例
import java.security.*;
import java.util.*;
public class Demo {
public static void main(String[] argv) throws Exception {
try {
Signature sign = Signature.getInstance("DSA");
Provider p = sign.getProvider();
Collection<Object> val = p.values();
Iterator i = val.iterator();
System.out.println("The unmodifiable Collection view is:
");
int x = 30;
while (x > 0) {
System.out.println(i.next());
x--;
}
} catch (NoSuchAlgorithmException e) {
System.out.println("Error!!! NoSuchAlgorithmException");
}
}
}输出
The unmodifiable Collection view is: SHA1withDSA SHA1withDSA SHA1withDSA Software sun.security.provider.JavaKeyStore$DualFormatJKS SHA sun.security.provider.SHA sun.security.provider.JavaKeyStore$CaseExactJKS Software sun.security.provider.DSA$SHA256withDSA SHA SHA1withDSA Software Software Software sun.security.provider.DSA$RawDSA X.509 java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey sun.security.provider.certpath.IndexedCollectionCertStore sun.security.provider.Sun SHA SHA1withDSA sun.security.provider.DomainKeyStore$DKS Software SHA256withDSA SHA224withDSA 1024 1024 Software sun.security.provider.DSAKeyFactory
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