Timer.java

package rsn170330.sp07;

/**
* Timer class for roughly calculating running time of programs
* @author rbk
* @author Rahul Nalawade (rsn170330)
* 
* Usage: Timer timer = new Timer(); timer.start(); timer.end();
* System.out.println(timer); // output statistics
*/
public class Timer {
	long startTime, endTime, elapsedTime, memAvailable, memUsed;

	public Timer() {
		startTime = System.currentTimeMillis();
	}

	public void start() {
		startTime = System.currentTimeMillis();
	}
	
	public void scale(int num) {
		elapsedTime /= num;
	}

	public Timer end() {
		endTime = System.currentTimeMillis();
		elapsedTime = endTime - startTime;
		memAvailable = Runtime.getRuntime().totalMemory();
		memUsed = memAvailable - Runtime.getRuntime().freeMemory();
		return this;
	}

	public String toString() {
		return "Time: " + elapsedTime + " msec.\n" + "Memory: " + (memUsed / 1048576) + 
		" MB / " + (memAvailable / 1048576) + " MB.";
	}
}