Java中的Hashtable elements()方法
Java Hashtable 类的Java .util.Hashtable.elements() 方法用于获取哈希表中存在的值的枚举。
句法:
Enumeration enu = Hash_table.elements()
参数:该方法不带任何参数。
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() 方法的工作原理:
方案一:
// 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 hash_table =
new Hashtable();
// 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
方案二:
// 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 hash_table =
new Hashtable();
// 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