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leJOS (pronounced like the Spanish word "lejos" for "far") is a tiny Java Virtual Machine. In 2013 it was ported to the LEGO EV3 brick.

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package lejos.utility; 

/**
* Elapsed time watch (in milliseconds) 

* To use - construct a new instance.  
*  @author Roger Glassey 
*  version 2     
*/
public class Stopwatch
{
/**
records system clock time (in milliseconds) when reset() was executed
*/
	private	int t0 = (int)System.currentTimeMillis(); 
	
/**
Reset watch to zero
*/
	public void reset()
	{
		t0 = (int)System.currentTimeMillis();
	}
/**
Return elapsed time in milliseconds 
*/
	public int elapsed( )
	{
		return (int)System.currentTimeMillis() -t0;
	}		
}