Inventory class

package game.items;

import java.util.ArrayList;
import java.util.List;

/**
 * User: geekocioso
 * Date: 4/17/13
 * Time: 5:46 AM
 */
public class Inventory {

    private int size;
    /**
     * We'll use this data structure to store the items and how many of them we have
     */
    private List<String> contents = new ArrayList<String>();

    /**
     * Constructor. Will need to specify the size of inventory to create it.
     * @param size Slots in the inventory
     */
    public Inventory(int size) {
        this.size = size;
    }

    /**
     * Checks how many of an item we have
     * @param name Item name
     * @return true if in inventory, false if not
     */
    public Boolean checkForItem(String name) {
        return contents.contains(name);
    }

    /**
     * Adds an item to the inventory
     * @param name Item to add
     * @return true if added successfully, false if not (cannot add when inventor is full)
     */
    public Boolean addItem(String name) {
        // do not add if inventory is null
        if (isFull()) return false;
        try {
            contents.add(name);
            System.out.println("Item " + name + " added to your inventory!");
        } catch (Exception e) {
            return false;
        }
        return true;
    }

    /**
     * Removes an item from inventory
     * @param name Item to remove
     * @return true if removed, false if not
     */
    public Boolean removeItem(String name) {
        if (contents.contains(name)) {
            try {
                contents.remove(name);
            } catch (Exception e) {
                return false;
            }
        } else {
            return false;
        }
        return true;
    }


    /**
     * Checks if inventory is full
     * @return true if full, false if not full
     */
    public Boolean isFull() {
        return contents.size() >= size;
    }

    /**
     * Queries for the number of empty slots left
     * @return number of empty slots in inventory
     */
    public Integer numberOfFreeSlots() {
        return size - contents.size();
    }

    /**
     * Writes a list of your inventory to the console
     */
    public void listContents() {
        if (contents.size() == 0) {
            System.out.println("Empty.");
        } else {
            System.out.println("Here's what you have:");
            for (String s: contents) {
                System.out.println("* " + s);
            }
        }
    }

}