Java中的 AlgorithmParameters getAlgorithm() 方法及示例

Java.security.AlgorithmParameters类的getAlgorithm()方法用于返回与此参数生成器关联的算法的标准名称。

句法：

public final String getAlgorithm()

返回值：该方法返回算法的字符串名称。

以下是说明getAlgorithm()方法的示例：

示例 1：对于算法DSA

Java

// Java program to demonstrate
// getAlgorithm() method
 
import java.security.*;
import java.util.*;
 
public class GFG1 {
    public static void main(String[] argv)
    {
        try {
            // creating the object of
            // AlgorithmParameters
            // and getting instance
            // using getInstance() method
            AlgorithmParameters sr
                = AlgorithmParameters
                      .getInstance("DSA");
 
            // generating the Parameters
            // using getAlgorithm() method
            String algo = sr.getAlgorithm();
 
            // printing the string algo
            System.out.println("Algorithm: "
                               + algo);
        }
 
        catch (NoSuchAlgorithmException e) {
 
            System.out.println("Exception thrown: "
                               + e);
        }
        catch (ProviderException e) {
 
            System.out.println("Exception thrown: "
                               + e);
        }
    }
}

输出：

Algorithm: DSA

示例 2：对于算法DiffieHellman

Java

// Java program to demonstrate
// getAlgorithm() method
 
import java.security.*;
import java.util.*;
 
public class GFG1 {
    public static void main(String[] argv)
    {
        try {
            // creating the object of
            // AlgorithmParameters
            // and getting instance
            // using getInstance() method
            AlgorithmParameters sr
                = AlgorithmParameters
                      .getInstance("DiffieHellman");
 
            // generating the Parameters
            // using getAlgorithm() method
            String algo = sr.getAlgorithm();
 
            // printing the string algo
            System.out.println("Algorithm: "
                               + algo);
        }
 
        catch (NoSuchAlgorithmException e) {
 
            System.out.println("Exception thrown: "
                               + e);
        }
        catch (ProviderException e) {
 
            System.out.println("Exception thrown: "
                               + e);
        }
    }
}

输出：

Algorithm: DiffieHellman

参考： https://docs.oracle.com/javase/9/docs/api/ Java/security/AlgorithmParameters.html#getAlgorithm–