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// Import necessary classes
import net.minecraft.client.Minecraft;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.util.EnumHand;
import net.minecraft.world.World;

// Create a new class for our gameplay code
public class MinecraftGameplay {
    // Get the Minecraft instance
    private Minecraft mc = Minecraft.getMinecraft();

    // Get the player instance
    private EntityPlayer player = mc.player;

    // Get the world instance
    private World world = mc.world;

    // Define a method to make the player jump
    public void makePlayerJump() {
        // Get the player's current velocity
        double velocity = player.motionY;

        // Set the player's velocity to make them jump
        player.motionY = 10.0D;
    }

    // Define a method to give the player an item
    public void givePlayerItem(Item item) {
        // Create a new item stack
        ItemStack stack = new ItemStack(item);

        // Add the item stack to the player's inventory
        player.inventory.addItemStackToInventory(stack);
    }

    // Define a method to make the player attack
    public void makePlayerAttack() {
        // Get the player's current hand
        EnumHand hand = player.getActiveHand();

        // Make the player attack
        player.swingArm(hand);
    }

    // Define a main method to test our gameplay code
    public static void main(String[] args) {
        // Create a new instance of our gameplay class
        MinecraftGameplay gameplay = new MinecraftGameplay();

        // Make the player jump
        gameplay.makePlayerJump();

        // Give the player a diamond sword
        gameplay.givePlayerItem(Item.getItemById(276));

        // Make the player attack
        gameplay.makePlayerAttack();
    }
}