package test;

import java.util.*;

public class Test2
{
public static final int _keyRange = 100;
public static final int _threadCount = 300;
public static final int _repeat = 100000;
//--------------------------------------------------------------------------------
public static void main( String[] args )
throws Exception
{
final long start = System.currentTimeMillis();
final Map map = new HashMap();

Runtime.getRuntime().addShutdownHook( new Thread( new Runnable()
	{
	public void run()
		{
		System.out.println( System.currentTimeMillis() - start );
		System.out.println( map );
		}
	} ) );

for( int i = 0; i < _threadCount; ++i )
	{
	new Thread( new Runnable()
		{
		public void run()
			{
			for( int k = 0; k < _repeat; ++k )
				{
				Random random = new Random();
				String key = "key" + random.nextInt( _keyRange );
				
				synchronized( map )
					{
					Integer value = ( Integer )map.get( key );
					if( value != null )
						{
						int oldValue = value.intValue();
						map.put( key, new Integer( oldValue + 1 ) );
						}
					else
						{
						map.put( key, new Integer( 1 ) );
						}
				
					}
				
				}
			}
		} ).start();
	}
}
//--------------------------------------------------------------------------------
}