import java.util.*;
public class HashMapTest
{
private static String names[] = { "one", "two", "three",
"four", "five", "six",
"seven", "two", "ten", "four" };
public HashMapTest()
{
HashMap m = new HashMap();
Integer i;
for ( int k = 0; k < names.length; k++ )
{
i = ( Integer ) m.get( new Character( names[ k ].charAt( 0 ) ) );
// if key is not in map then give it value one
// otherwise increment its value by 1
if ( i == null )
m.put( new Character( names[ k ].charAt( 0 ) ), new Integer( 1 ) );
else
m.put( new Character( names[ k ].charAt( 0 ) ), new Integer( i.intValue() + 1 ) );
}
System.out.println( "\nnumber of words beginning with " + "each letter: " );
printMap( m );
}
public void printMap( Map mapRef )
{
System.out.println( mapRef.toString() );
System.out.println( "size: " + mapRef.size() );
System.out.println( "isEmpty: " + mapRef.isEmpty() );
}
public static void main( String args[] )
{
new HashMapTest();
}
}