I have problems with understanding task.

Question about the task

Arkanoid (part 13)

Java Multithreading, Level 3, Lesson 13

Under discussion

Solutions please...

The Ball class is more complicated, since the ball moves.

We're going to need private fields:
a) double speed (the ball's speed);
b) double direction (the direction of motion in degrees: from 0 to 360);
c) double dx (the distance along the x axis that the ball travels in one step, calculated using speed and direction);
d) double dy (the distance along the y axis that the ball travels in one step, calculated using speed and direction);
e) boolean isFrozen (true if the ball is "frozen", i.e. not moving).

Don't forget to add getters for all the fields of this class, except isFrozen (we'll only be using it inside the Ball class).

And we'll also make a constructor:
a) parameters — x, y, speed, direction;
b) radius (for calling the parent class) is always 1;
c) don't forget to set isFrozen to true—the ball isn't flying anywhere at the beginning of the game.

Requirements:

A private double speed field must be created in the Ball class.
A private double direction field must be created in the Ball class.
A private double dx field must be created in the Ball class.
A private double dy field must be created in the Ball class.
A private boolean isFrozen field must be created in the Ball class.
A public constructor must be created in the Ball class (the behavior and parameters are described in the task conditions).
There must be a proper public getter for the speed field in the Ball class.
There must be a proper public getter for the direction field in the Ball class.
There must be a proper public getter for the dx field in the Ball class.
There must be a proper public getter for the dy field in the Ball class.

package com.codegym.task.task24.task2413; public class Ball extends BaseObject{ private double speed; private double direction; private double dx; private double dy; private boolean isFrozen; public double getSpeed() { return speed; } public double getDirection() { return direction; } public double getDx() { return dx; } public double getDy() { return dy; } public Ball(double x, double y, double radius) { super(x, y, radius); } public Ball(double x, double y, double speed, double direction) { //super((x, y, speed, direction); // this(x, y, speed, direction); } @Override void draw(Canvas canvas) { } @Override void move() { } }

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Switch/Cypher

Level 25 , Bexleyheath , United Kingdom

30 October 2020, 10:55

You are also missing some getters and setters. In IntelliJ just command + n and select all other that the boolean.

Switch/Cypher

Level 25 , Bexleyheath , United Kingdom

30 October 2020, 10:54

Change the constructor that you've already made. Delete:

public Ball(double x, double y, double radius) {
       super(x, y, radius);
   }

And set the new constructor:

public Ball(double x, double y, double speed, double direction) {
     super(x, y, 1);
this.speed = speed;
this.direction = direction;
isFrozen = true;
    }