Java 中的提供程序 toString()方法，示例
原文:https://www . geesforgeks . org/provider-tostring-method-in-Java-with-examples/
java.security.Provider 类的 toString() 方法用于返回一个带有该提供程序名称和版本号的字符串。
语法:
public String toString()
返回值:这个方法返回这个提供者的带有名称和版本号的字符串。
以下是说明 toString() 方法的示例:
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);
}
}
}
Output:
Provider : SUN version 1.8
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);
}
}
}
Output:
Provider : SUN version 1.8
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