The 9th check fails and I don't see why

Question about the task

Resolved

it says:

In the move(boolean, boolean, boolean) method, the x field must be incremented by the value of speedX after the speedX field has been changed.

It seems that x get's incremented by speedX after updating the speedX field. I must overlook something but I can't see what is might be.

Let's continue implementing the rocket’s movement. It should be able to move vertically and horizontally.
Let’s make the necessary changes in the move method: now its parameters will be the states of keys. The first parameter is isUpPressed, the second — isLeftPressed, and the third — isRightPressed.
We’ll create a speedX variable to set the speed of motion along the X axis. Like speedY, the value of this variable will be changed in the move method, depending on which keys are pressed. Also, don’t forget to change the coordinates themselves (x and y).

Requirements:

The Rocket class must have a double private speedX field that is initialized to 0 when it is declared.
The Rocket class must have a public void move(boolean isUpPressed, boolean isLeftPressed, boolean isRightPressed) method.
The Rocket class must not have a public void move() method.
In the move(boolean, boolean, boolean) method, the value of the speedY field must decrease by the value of boost if the method's isUpPressed parameter is true.
In the move(boolean, boolean, boolean) method, the value of the speedY field must increase by the value of boost if the method's isUpPressed parameter is false.
In the move(boolean, boolean, boolean) method, the y field must be incremented by the value of speedY after the speedY field has been changed.
In the move(boolean, boolean, boolean) method, the value of the speedX field must decrease by the value of boost if the method's isLeftPressed parameter is true.
In the move(boolean, boolean, boolean) method, the value of the speedX field must increase by the value of boost if the method's isRightPressed parameter is true.
In the move(boolean, boolean, boolean) method, the x field must be incremented by the value of speedX after the speedX field has been changed.
In the MoonLanderGame class's onTurn(int) method, the move(boolean, boolean, boolean) method must be called on the rocket object with the following arguments: isUpPressed, isLeftPressed, isRightPressed.

package com.codegym.games.moonlander; public class Rocket extends GameObject{ private double speedY = 0; private double speedX = 0; private double boost = 0.05; public Rocket(double x, double y) { super(x, y, ShapeMatrix.ROCKET); } public void move(boolean isUpPressed, boolean isLeftPressed, boolean isRightPressed){ speedY = isUpPressed ? speedY - boost : speedY + boost; speedX = isLeftPressed ? speedX - boost : speedX; speedX = isRightPressed ? speedX + boost : speedX; y += speedY; x += speedX; } }

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Premachandran

Level 35 , Ernakulam, India

4 April 2020, 15:17

line 16 is to be executed only if the value of sppedX has changed

Igor

Level 1 , Belgrade, Serbia

27 September 2019, 13:05

solution

Not sure if you already solved it, I had troubles as well, and solution that worked is to update x only if speedX is actually changed, not if it stays the same (no key is pressed).

Han

Level 24 , Netherlands

3 October 2019, 12:32

Thank you, I did some other challenges in the mean time but that was the tip that worked!