Java中的提供者 keys() 方法及示例

Java.security.Provider类的keys()方法用于返回此哈希表中的键的枚举。

句法：

public Enumeration keys()

返回值：此方法返回此哈希表中键的枚举。

以下是说明keys()方法的示例：

方案一：

Java

// Java program to demonstrate
// keys() method
 
import java.security.*;
import java.util.*;
 
public class GFG1 {
    public static void main(String[] argv)
    {
        // Declaring int variable
        int i = 10;
 
        try {
            // creating the object of SecureRandom
            SecureRandom sr = SecureRandom.getInstance("NativePRNGBlocking");
 
            // getting the Provider of the SecureRandom sr
            // by using method getProvider()
            Provider provider = sr.getProvider();
 
            // Declaring the variable of Enumeration