Java中的Hashtable elements()方法

爪哇。util。哈希表。Java中Hashtable类的elements()方法用于获取Hashtable中存在的值的枚举。

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语法:

Enumeration enu = Hash_table.elements()

参数: 该方法不采用任何参数。

返回值: 该方法返回哈希表值的枚举。

下面的程序用来说明java的工作原理。util。哈希表。elements()方法: 项目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

项目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

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