我正在尝试为用户创建一个菜单，以查看地图中的所有项目并进行选择。不幸的是输出不正确，因为它调用pairs.getValue()调用的默认tostring函数，我希望它调用自定义函数getName()。如果我尝试使用pairs.getValue().getName()，我会收到语法错误，因为它希望这是一个对象，而对象没有getName函数。我尝试像(Item)pairs.getValue().getName()一样投射它并且也没有用，所以我不确定如何为正确的输出调用getName函数。因为我使用地图，所以我也没有一种有效的方法让用户做出选择。如果他们输入“1”我实际上无法在开关中使用1来获取首先输出的实际项目，因为地图不使用索引...我想不出允许用户使用的好方法只需输入一个数字并能够从地图中获取实际对象，因此建议采用新方法将是非常棒的......如果是C ++，我会抓住map.iterator.begin()和{{1} } +获取位置...但我认为你不能用Java做到这一点。感谢任何想法，谢谢！
int如果你想看到我要添加的任何其他代码，请告诉我。谢谢！
字符
Iterator it = character.get("Items").entrySet().iterator();
int i = 1;
while(it.hasNext())
{
Map.Entry pairs = (Map.Entry)it.next();
System.out.println("[" + i + "] " + pairs.getKey() + " = " + pairs.getValue());
i++;
}
System.out.print("\nYour Choice: ");
i = reader.readInt(1,character.get("Items").size());
switch(i)
{
//foo
}
如果你想看到父母......
/**
* Stats
* Items
* BodyParts
* Attributes
* Abilities
* Skills
* Effects
* Quests
* Weapons
* Armors
*
*
*
*
**/
import java.util.HashMap;
import java.io.Serializable;
public class Character extends GameObject
{
protected HashMap<String, HashMap> character;
protected HashMap<String, Weapon> weapons;
protected HashMap<String, Armor> armors;
protected HashMap<String, Attribute> attributes;
protected HashMap<String, Skill> skills;
protected HashMap<String, Effect> effects;
protected HashMap<String, Stat> stats;
protected HashMap<String, Ability> abilities;
protected HashMap<String, Quest> quests;
protected HashMap<String, Item> items;
protected HashMap<String, Response> responses;
protected HashMap<String, Implant> implants;
public Character()
{
name = "Greg";
description = "Just a regular guy living in a binary world";
buildCharacter();
}
public Character(String newName, String newDescription)
{
name = newName;
description = newDescription;
buildCharacter();
}
public Character(String newName, String newDescription, HashMap<String, Weapon> newWeapons, HashMap<String, Armor> newArmors, HashMap<String, Response> newResponses, HashMap<String, Attribute> newAttributes, HashMap<String, Skill> newSkills, HashMap<String, Effect> newEffects, HashMap<String, Stat> newStats, HashMap<String, Ability> newAbilities, HashMap<String, Quest> newQuests, HashMap<String, Item> newItems, HashMap<String, Implant> newImplants, int level, int coins, int health, int mana, int energy, int power, int accuracy, int toughness, int dexterity, int speed, int stealth, int concentration, int crit, int vision, int hearing, int smell, int temperature, int hunger, int thirst, String type)
{
character = new HashMap<String, HashMap>();
name = newName;
description = newDescription;
weapons = newWeapons;
armors = newArmors;
responses = newResponses;
attributes = newAttributes;
abilities = newAbilities;
quests = newQuests;
items = newItems;
implants = newImplants;
character.put("Weapons",weapons);
character.put("Armors",armors);
character.put("Attributes",attributes);
character.put("Skills",skills);
character.put("Effects",effects);
character.put("Stats",stats);
character.put("Abilities",abilities);
character.put("Quests",quests);
character.put("Items",items);
character.put("Responses",responses);
character.put("Implants",implants);
skills.put("Level", new Skill("Level","Overall Level",level));
items.put("Coins",new Item("Coins","Your Money", coins));
attributes.put("Health",new Attribute("Health","Your hit points",1,health));
attributes.put("Mana",new Attribute("Mana","Magic casting resource",1,mana));
attributes.put("Energy",new Attribute("Energy","Physical ability resource",1,energy));
attributes.put("Power",new Attribute("Power","Damage with attacks",1,power));
attributes.put("Accuracy",new Attribute("Accuracy","Chance to hit",1,accuracy));
attributes.put("Toughness",new Attribute("Toughness","Health regeneration / Physical damage reduction",1,toughness));
attributes.put("Dexterity",new Attribute("Dexterity","Energy regeneration / Dodge chance",1,dexterity));
attributes.put("Speed",new Attribute("Speed","Global cooldowns",1,speed));
attributes.put("Stealth",new Attribute("Stealth","Ability to remain hidden",1,stealth));
attributes.put("Concentration",new Attribute("Concentration","Mana regeneration / magical resistance",1,concentration));
attributes.put("Crit",new Attribute("Crit","Chance to hit criticals",1,crit));
attributes.put("Vision",new Attribute("Vision","View Distance",1,vision));
attributes.put("Hearing",new Attribute("Hearing","Ear range",1,hearing));
attributes.put("Smell",new Attribute("Smell","Smell Distance",1,smell));
attributes.put("Temperature",new Attribute("Temperature","Current Temperature",1,temperature));
attributes.put("Hunger",new Attribute("Hunger","Hunger Levels",1,hunger));
attributes.put("Thirst",new Attribute("Thirst","Amount of thirstiness",1,thirst));
stats.put("Type",new Stat("Type",type));
}
public void buildCharacter()
{
character = new HashMap<String, HashMap>();
responses = new HashMap<String, Response>();
weapons = new HashMap<String, Weapon>();
armors = new HashMap<String, Armor>();
attributes = new HashMap<String, Attribute>();
skills = new HashMap<String, Skill>();
effects = new HashMap<String, Effect>();
stats = new HashMap<String, Stat>();
abilities = new HashMap<String, Ability>();
quests = new HashMap<String, Quest>();
items = new HashMap<String, Item>();
implants = new HashMap<String, Implant>();
character.put("Weapons",weapons);
character.put("Armors",armors);
character.put("Attributes",attributes);
character.put("Skills",skills);
character.put("Effects",effects);
character.put("Stats",stats);
character.put("Abilities",abilities);
character.put("Quests",quests);
character.put("Items",items);
character.put("Responses",responses);
character.put("Implants",implants);
skills.put("Level", new Skill("Level","Overall Level",1));
items.put("Coins",new Item("Coins","Your Money"));
attributes.put("Health",new Attribute("Health","Your hit points",1,10));
attributes.put("Mana",new Attribute("Mana","Magic casting resource",1,10));
attributes.put("Energy",new Attribute("Energy","Physical ability resource",1,10));
attributes.put("Power",new Attribute("Power","Damage with attacks",1,1));
attributes.put("Accuracy",new Attribute("Accuracy","Chance to hit",1,1));
attributes.put("Toughness",new Attribute("Toughness","Health regeneration / Physical damage reduction",1,1));
attributes.put("Dexterity",new Attribute("Dexterity","Energy regeneration / Dodge chance",1,1));
attributes.put("Speed",new Attribute("Speed","Global cooldowns",1,1));
attributes.put("Stealth",new Attribute("Stealth","Ability to remain hidden",1,1));
attributes.put("Concentration",new Attribute("Concentration","Mana regeneration / magical resistance",1,1));
attributes.put("Crit",new Attribute("Crit","Chance to hit criticals",1,1));
attributes.put("Vision",new Attribute("Vision","View Distance",1,1));
attributes.put("Hearing",new Attribute("Hearing","Ear range",1,1));
attributes.put("Smell",new Attribute("Smell","Smell Distance",1,1));
attributes.put("Temperature",new Attribute("Temperature","Current Temperature",1,1));
attributes.put("Hunger",new Attribute("Hunger","Hunger Levels",1,1));
attributes.put("Thirst",new Attribute("Thirst","Amount of thirstiness",1,1));
stats.put("Type",new Stat("Type","Human"));
//effects
//abilities
//inventory
//dialogue
}
//getResponse
public HashMap get(String key)
{
return character.get(key);
}
public Weapon getWeapon(String key)
{
return weapons.get(key);
}
public void setWeapon(String key, Weapon newWeapon)
{
weapons.put(key,newWeapon);
}
public Armor getArmor(String key)
{
return armors.get(key);
}
public void setArmor(String key, Armor newArmor)
{
armors.put(key,newArmor);
}
public Attribute getAttribute(String key)
{
return attributes.get(key);
}
public Skill getSkill(String key)
{
return skills.get(key);
}
public Stat getStat(String key)
{
return stats.get(key);
}
public Ability getAbility(String key)
{
return abilities.get(key);
}
public Quest getQuest(String key)
{
return quests.get(key);
}
public Item getItem(String key)
{
return items.get(key);
}
public Effect getEffect(String key)
{
return effects.get(key);
}
public Response getResponse(String key)
{
return responses.get(key);
}
}
答案 0 :(得分：1)
我相信你正在寻找这样的东西：
((Item)pairs.getValue()).getName()
答案 1 :(得分：1)
这里使用的正确的东西是类型参数（Java世界中的泛型）。这是一种告诉编译器要在集合中存储的类型的方法。
当您尝试在单个地图中存储不同类型的对象时，我们将GameObject作为集合的基本类型。首先，让我们为主存储器声明一个合适的内容类型：
protected HashMap<String, HashMap<String, ? extends GameObject>> character;
...
character = new HashMap<String, HashMap<String, ? extends GameObject>>();
这意味着我们有以下伪代码映射：
字符串 - ＆gt; Map（String - ＆gt;扩展GameObject的东西）
接下来，我们需要更改accesor方法以反映详细的返回类型：
//getResponse
public HashMap<String, ? extends GameObject> get(String key) {
return character.get(key);
}
并在使用网站上设置适当的类型边界：
int i = 1;
for (Map.Entry<String, ? extends GameObject> item : character.get("Items").entrySet()) {
System.out.println("[" + i + "] " + item.getKey() + " = " + item.getValue().getName());
i++;
}
对我来说，它编译并运行时没有错误或警告。