LACS2013-BallRunner.java

/**
BallRunner.java     MrG 2013.0603
purpose:    animate a bouncing ball
required:   BallRunner.java     main class
        Ball.java       derived class
        StdDraw.java        graphics class
translator: javac BallRunner.java
interpreter:    java BallRunner N
*/

public class BallRunner
{
    public static void main(String[] args)
    {
        int N = Integer.parseInt(args[0]);
        Ball[] balls = new Ball[N];
        for(int i=0; i<N; i++)
        {
            balls[i] = new Ball();
        }

        StdDraw.setCanvasSize(1550,1150);
        StdDraw.setXscale(-10.0,10.0);
        StdDraw.setYscale(-10.0,10.0);

        while(true)
        {
            StdDraw.clear(StdDraw.WHITE);
            for(int j=0; j<N; j++)
            {
                balls[j].move();
                balls[j].draw();
            }
            StdDraw.show(1);
        }
    }
}