/************************************************************
* Compilation: javac BouncingBalls.java
* Execution: java BouncingBalls N
* Dependencies: Ball.java StdDraw.java
* Booksite 3.4
* Client to create and animate an array of N bouncing balls
************************************************************/
public class BouncingBalls {
public static void main(String[] args) {
// number of bouncing balls from command-line argument
int N = ________________________________________(args[0]);
// Set window coordinates between -1 and +1
StdDraw.setXscale(-1.0, 1.0);
StdDraw.setYscale(-1.0, 1.0);
// create an array of N random balls
Ball[] balls = ________________________________________
for (int i = 0; i < N; i++)
balls[i] = ________________________________________
// do the animation loop
while(true) {
// Gray Background
StdDraw.setPenColor(StdDraw.GRAY);
StdDraw.filledSquare(0.0, 0.0, 1.0);
// draw N black balls
StdDraw.setPenColor(StdDraw.BLACK);
for (int i = 0; i < ____; i++) {
_____________________________________
_____________________________________
}
StdDraw.show(20);
}
}
}
/*********************************************************************
Recommended Book Exercises: 3.2.5, 3.2.11 (Point.java code on Booksite)
*********************************************************************/