FrameRate.java

import java.awt.Color;
import java.awt.Graphics;

class FrameRate {

	String frameRate; // to display the frame rate to the screen
	long lastTimeCheck; // store the time of the last time the time was recorded
	long deltaTime = 0; // to keep the elapsed time between current time and
						// last
	// time
	int frameCount; // used to count how many frame occurred in the elasped time
					// (fps)

	public FrameRate() {
		lastTimeCheck = System.currentTimeMillis();
		frameCount = 0;
		frameRate = "0 fps";
	}

	public void update() {
		long currentTime = System.currentTimeMillis(); // get the current time
		deltaTime += currentTime - lastTimeCheck; // add to the elapsed time
		lastTimeCheck = currentTime; // update the last time var
		frameCount++; // everytime this method is called it is a new frame
		if (deltaTime >= 1000) { // when a second has passed, update the string
									// message
			frameRate = frameCount + " fps";
			frameCount = 0; // reset the number of frames since last update
			deltaTime = 0; // reset the elapsed time
		}
	}

	public void draw(Graphics g, int x, int y) {
		//System.out.println(frameRate);
		g.setColor(Color.WHITE);
		g.drawString(frameRate, x, y); // display the frameRate
	}

}