java bukkit double jump

Bukkit is a plugin development platform for the Minecraft game that allows developers to create new features for the game using the Java programming language. If you want to add double jump functionality to a Bukkit plugin, here's an example of how to do this:

import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerMoveEvent;

public class DoubleJump implements Listener {
  @EventHandler
  public void onPlayerMove(PlayerMoveEvent event) {
    Player jogador = event.getPlayer();

    // Checks if the player is on the ground and if he pressed the jump button
    if (jogador.isOnGround() && jogador.isSneaking()) {
      // Causes the player to jump twice as high
      jogador.setVelocity(jogador.getVelocity().setY(1.5));
      jogador.setVelocity(jogador.getVelocity().setY(1.5));
    }
  }
}

This code adds a listener of player movement events that checks whether the player is on the ground and that he pressed the jump button (sneak). If both conditions are true, the player is made to jump twice as high as normal, using the 'setVelocity' method of the 'Player' class.

To use this code in your plugin, you will need to register the "listener" in your 'plugin.yml' file and add the code to your plugin using bukkit's default class framework. See the Bukkit documentation for more information on how to create plugins for Minecraft.