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CactusServer / src / main / java / cactusServer / entities / Item.java
package cactusServer.entities;

public class Item extends Entity{
	private String name;
	private int amount;
	
	public Item(String name, int amount) {
		this.name = name;
		this.amount = amount;
	}

	public String getName() {
		return name;
	}
	
	public int getAmount() {
		return amount;
	}
	
	public boolean isEmpty() {
		return (amount == 0);
	}
	
	public Item changeAmount(int amountOfChange) {
		amount = Math.max(amount + amountOfChange, 0);
		return this;
	}
	
	@Override
	public int hashCode() {
		int result = 17;
		result = result * 31 + name.hashCode();
		return result;
	}
	
	@Override
	public boolean equals(java.lang.Object obj) {
		if (this == obj) {
			return true;
		}
		if (obj instanceof Item) {
			Item item = (Item)obj;
			if (this.name.equals(item.name)) {
				return true; // 同名のアイテムは等価
			}
		}
		return false;
	}
}