Java中的提供者 toString() 方法和示例

Java.security.Provider类的toString()方法用于返回一个字符串，其中包含此提供程序的名称和版本号。

句法：

public String toString()

返回值：此方法返回包含此提供程序的名称和版本号的字符串。

下面是说明toString()方法的示例：

示例 1：

// Java program to demonstrate
// getVersion() method
  
import java.security.*;
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv) throws Exception
    {
  
        try {
            // creating the object of  KeyPairGenerator
            KeyPairGenerator sr = KeyPairGenerator.getInstance("DSA", "SUN");
  
            // getting the Provider of the KeyPairGenerator sr
            // by using method getProvider()
            Provider provider = sr.getProvider();
  
            // getting the name and version of the provider
            // using toString() method
            String nv = provider.toString();
  
            // printing the string info
            System.out.println("Provider : " + nv);
        }
  
        catch (NoSuchAlgorithmException e) {
  
            System.out.println("Exception thrown : " + e);
        }
    }
}

输出：

Provider : SUN version 1.8

示例 2：

// Java program to demonstrate
// getVersion() method
  
import java.security.*;
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv) throws Exception
    {
  
        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();
  
            // getting the name and version of the provider
            // using toString() method
            String nv = provider.toString();
  
            // printing the string info
            System.out.println("Provider : " + nv);
        }
  
        catch (NoSuchAlgorithmException e) {
  
            System.out.println("Exception thrown : " + e);
        }
    }
}

输出：

Provider : SUN version 1.8