Intro to JAVA:

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A ball bounces along the x-axis between a wall at 0 and another wall at a given distance. The move method advances its position by one unit. When it reaches either wall, it changes direction.

CODE:

/** This class models a ball that bounces off walls. */ public class Ball { // Instance variables . . .

/** Constructs a ball at position 0 traveling east. @param rightWall the position of the wall to the right */ public Ball(int rightWall) { . . . }

/** Moves the ball. */ public void move() { . . . }

/** Gets the current position. @return the current position */ public int getPosition() { . . . } }