Java Hashtable elements()方法

Java中Hashtable类的java.util.Hashtable.elements()方法是用来获取Hashtable中存在的枚举值的。

语法

Enumeration enu = Hash_table.elements()

参数： 该方法不接受任何参数。

返回值： 该方法返回Hashtable的值的枚举。

以下程序用于说明java.util.Hashtable.elements()方法的工作：

程序1 :

// Java code to illustrate the elements() method
import java.util.*;
  
public class Hash_Table_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty Hashtable
        Hashtable<Integer, String> hash_table = 
                    new Hashtable<Integer, String>();
  
        // Inserting elements into the table
        hash_table.put(10, "Geeks");
        hash_table.put(15, "4");
        hash_table.put(20, "Geeks");
        hash_table.put(25, "Welcomes");
        hash_table.put(30, "You");
  
        // Displaying the Hashtable
        System.out.println("The Table is: " + hash_table);
  
        // Creating an empty enumeration to store
        Enumeration enu = hash_table.elements();
  
        System.out.println("The enumeration of values are:");
  
        // Displaying the Enumeration
        while (enu.hasMoreElements()) {
            System.out.println(enu.nextElement());
        }
    }
}

输出:

The Table is: {10=Geeks, 20=Geeks, 30=You, 15=4, 25=Welcomes}
The enumeration of values are:
Geeks
Geeks
You
4
Welcomes

示例2 :

// Java code to illustrate the elements() method
import java.util.*;
  
public class Hash_Table_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty Hashtable
        Hashtable<String, Integer> hash_table = 
                   new Hashtable<String, Integer>();
  
        // Inserting elements into the table
        hash_table.put("Geeks", 10);
        hash_table.put("4", 15);
        hash_table.put("Geeks", 20);
        hash_table.put("Welcomes", 25);
        hash_table.put("You", 30);
  
        // Displaying the Hashtable
        System.out.println("The Table is: " + hash_table);
  
        // Creating an empty enumeration to store
        Enumeration enu = hash_table.elements();
  
        System.out.println("The enumeration of values are:");
  
        // Displaying the Enumeration
        while (enu.hasMoreElements()) {
            System.out.println(enu.nextElement());
        }
    }
}

输出:

The Table is: {You=30, Welcomes=25, 4=15, Geeks=20}
The enumeration of values are:
30
25
15
20