Solved Trying to create a Levitating animation in an ArmorStand

This is my code:

Spoiler

Code (Java):

public class HeadAnimation {
 
    private Main plugin;
    private ArmorStand armor;
    private double blocksdown = 2;
    private double blocksToUpAndDown = 0
    private double blocksdowned = blocksToUpAndDown;
    boolean up = false;

    public void LevitationAnimation() {
        new BukkitRunnable() {
            public void run () {
                if (!(up)) {
                    double y = armor.getLocation().clone().getY();
                    if(blocksdowned != blocksdown) {
                        double getter = blocksdowned + 0.2;
                        blocksdowned = getter;
                        double newY = (y - 0.2);
                        armor.teleport(new Location(armor.getWorld(), armor.getLocation().getX(), newY, armor.getLocation().getZ()));
                    }
                    else if (blocksdowned == blocksdown) {
                        up = true;
                    }
                }
                else if(up) {
                    double y = armor.getLocation().clone().getY();
                    if(blocksdowned != 0) {
                        double getter = blocksdowned - 0.2;
                        blocksdowned = getter;
                        double newY = (y + 0.2);
                        armor.teleport(new Location(armor.getWorld(), armor.getLocation().getX(), newY, armor.getLocation().getZ()));
                    }else if(blocksdowned == 0) {
                        up = false;
                    }
                }
           
            }
        }.runTaskTimer(plugin, 0, 3);
    }
 

Practically when I run this code, it starts to go down, but never goes up, any help?

 

can you make me an example? please <3

 

nevermind
I just started to use
(blocksdowned < blocksdown)
and that things.

thanks for the help