import cn.nukkit.event.inventory.InventoryTransactionEvent; //导入依赖的package包/类
@Override
public boolean execute(boolean force) {
    if (this.hasExecuted || (!force && !this.canExecute())) {
        return false;
    }

    InventoryTransactionEvent ev = new InventoryTransactionEvent(this);
    Server.getInstance().getPluginManager().callEvent(ev);
    if (ev.isCancelled()) {
        for (Inventory inventory : this.inventories) {
            if (inventory instanceof PlayerInventory) {
                ((PlayerInventory) inventory).sendArmorContents(this.getSource());
            }
            inventory.sendContents(this.getSource());
        }
        return false;
    }

    for (Transaction transaction : this.transactions) {
        transaction.getInventory().setItem(transaction.getSlot(), transaction.getTargetItem());
    }

    this.hasExecuted = true;

    return true;
}
 

import cn.nukkit.event.inventory.InventoryTransactionEvent; //导入依赖的package包/类
@Override
public boolean execute() {
    if (this.hasExecuted || !this.canExecute()) {
        return false;
    }

    InventoryTransactionEvent ev = new InventoryTransactionEvent(this);
    Server.getInstance().getPluginManager().callEvent(ev);
    if (ev.isCancelled()) {
        for (Inventory inventory : this.inventories) {
            if (inventory instanceof PlayerInventory) {
                ((PlayerInventory) inventory).sendArmorContents(this.getSource());
            }
            inventory.sendContents(this.getSource());
        }

        return false;
    }

    for (Transaction transaction : this.transactions) {
        transaction.getInventory().setItem(transaction.getSlot(), transaction.getTargetItem());
    }

    this.hasExecuted = true;

    return true;
}