我正在做我的第一个Java项目，但有一个问题。这个问题应该很简单（尽管代码不是那么短，但是没有理由被吓到:)）。我创建了一个基本的角色扮演游戏，并且有一个定义每个角色的抽象类“角色”。在其子类中，您可以找到拥有法术书（地图）的法师。 Spellbook类提供了类似addToSpellbook的方法，效果很好。另外，我还有一个具有addToInventory方法的Inventory类，该方法与addToSpellbook完全相同。
我的问题如下-为什么我可以在主要方法中使用addToSpellbook而不能使用AddToInventory？
我想原因是Map没有AddToInventory，所以我应该覆盖put，但是仍然如何使用addToSpellbook？
public class Game {
public static void main(String[] args) throws IOException {
CharacterCreator heroCreator = new CharacterCreator();
CharacterCreator.showAllClasses();
Scanner sc = new Scanner(System.in);
int scan = sc.nextInt();
String chosenClass = CharacterCreator.getCharacterClass(scan);
Character hero = CharacterCreator.createCharacter(chosenClass);
try {
hero.displayCharacter();
}catch (Exception e){
System.out.println("Problem displaying character data");
}
hero.getInventory().addToInventory("Long sword");
CharacterCreator heroCreator2 = new CharacterCreator();
CharacterCreator.showAllClasses();
Scanner sc2 = new Scanner(System.in);
int scan2 = sc.nextInt();
String chosenClass2 = CharacterCreator.getCharacterClass(scan2);
Character hero2 = CharacterCreator.createCharacter(chosenClass2);
try {
hero2.displayCharacter();
}catch (Exception e){
System.out.println("Wrong input");
}
if(hero instanceof Mage) {
((Mage)hero).getSpellBook().addToSpellBook("Magic Missiles");
((Mage)hero).getSpellBook().addToSpellBook("Fireball");
((Mage)hero).getSpellBook().addToSpellBook("Mage Armor");
((Mage)hero).getSpellBook().showSpellBook();
((Mage)hero).getSpellBook().getSpellFromSpellbook("Fireball").castSpell(hero, hero2);
((Mage)hero).getSpellBook().getSpellFromSpellbook("Magic Missiles").castSpell(hero, hero2);
((Mage)hero).getSpellBook().getSpellFromSpellbook("Mage Armor").castSpell(hero, hero);
}
}
}
abstract public class Character {
private Equipment equipment;
private Map<String, Integer> inventory;
protected Character(String name){
equipment = new Equipment();
inventory = new HashMap<String, Integer>();
}
protected Character(String name, int lvl){
equipment = new Equipment();
inventory = new HashMap<String, Integer>();
}
}
public Equipment getEquipment() { return equipment; }
public Map getInventory() { return inventory; }
}
public class Inventory {
private Map<String,Integer> inventory;
Inventory() {
inventory = new HashMap<String, Integer>();
}
public void addToInventory(String item) {
boolean found = false;
try {
for (Iterator<Map.Entry<String, Integer>> iter = inventory.entrySet().iterator(); iter.hasNext(); ) {
Map.Entry<String, Integer> newItem = iter.next();
if (newItem.getKey() == item) {
inventory.put(item, inventory.get(newItem) + 1);
break;
}
}
}catch (Exception e) {
System.out.println(item + " : adding failed");
}
if (!found) {
inventory.put(item,1);
}
}
public void showInventory() {
System.out.println("Show Inventory: ");
for (Map.Entry<String,Integer> entry: inventory.entrySet()) {
System.out.println( entry.getKey() + ", quantity: " + entry.getValue() );
}
System.out.println("");
}
}
public class Mage extends Character {
private SpellBook spellBook;
public Mage(String name) {
super(name);
SpellBook spellbook = new SpellBook();
}
protected Mage(String name, int lvl){
super(name, lvl);
spellBook = new SpellBook();
}
public SpellBook getSpellBook() { return spellBook; }
}
}
public class SpellBook {
private Map<String, Spell> spellBook;
SpellBook() {
spellBook = new HashMap<String, Spell>();
}
public Map getSpellBook() { return spellBook; }
public void addToSpellBook(String spellName) {
Spell newSpell = null;
try {
if (DamageSpell.getSpell(spellName) != null) {
newSpell = DamageSpell.getSpell(spellName);
} else if (ChangeStatSpell.getSpell(spellName) != null) {
newSpell = ChangeStatSpell.getSpell(spellName);
}
System.out.println(newSpell.getSpellName() + " has been added to the spellbook");
spellBook.put(newSpell.getSpellName(), newSpell);
} catch (Exception e){
System.out.println("Adding " + spellName +"to spellbook has failed");
}
}
public void showSpellBook() {
System.out.println("Show spellbook: ");
for (Iterator<String> iter = spellBook.keySet().iterator(); iter.hasNext(); ) {
String spell = iter.next();
System.out.println(spell);
}
System.out.println("");
}
public Spell getSpellFromSpellbook(String spellName) {
Spell spl = null;
//Spell splGet = spellBook.get(spellName); /* straight forward implementation*/
// System.out.println("The spell " + splGet.getSpellName() + " has been retrived from the spellbook by using get method");
try {
for (Iterator<Map.Entry<String, Spell>> iter = spellBook.entrySet().iterator(); iter.hasNext(); ) {
Map.Entry<String, Spell> spell = iter.next();
if (spell.getKey() == spellName) {
spl = spell.getValue();
}
}
}catch (Exception e) {
System.out.println(spellName + " : no such spell in spellbook");
}
return spl;
}
}
最佳答案
getInventory()返回Map，而Map没有addToInventory()方法。getInventory()应该添加一个Inventory实例。