Please help me to solve these problems

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.

Ball.java

/** 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() { . . . } }

A ball bounces inside a given rectangle, starting at the rectangles bottom left corner at (0, 0) and initially moving in the northeast direction. When the ball bounces on a wall, it turns 90 degrees clockwise. If it bounces on a corner, its direction reverses. The move method advances its position by one unit in the x-direction (left or right) and one unit in the y-direction (up or down).

Ball.java

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

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

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

/** Turns the ball direction 90 degrees clockwise. */ private void turn() { . . . }

/** Gets the current x-position. @return the x-position */ public int getX() { . . . }

/** Gets the current y-position. @return the y-position */ public int getY() { . . . } }