我创造了某种基本的RPG。我使用了合成（角色和战斗机），并且在CharacterCreator类中存在问题。它说有不兼容的类型，Game.Fighter（以及我创建的其他角色类）和Game.Character。知道为什么以及如何解决这个问题？
public class Game {
public static void main(String[] args) throws IOException {
Character hero = CharacterCreator.createCharacter();
try {
hero.displayCharacter();
}catch (Exception e){
System.out.println("Wrong");
}
}
}
public class CharacterCreator {
public static Character createCharacter() {
System.out.println("Choose a character: ");
System.out.println("1. Fighter");
System.out.println("2. Rogue");
System.out.println("3. Mage");
System.out.println("4. Cleric");
Scanner sc = new Scanner(System.in);
int scan = sc.nextInt();
String chosenClass = getCharacterClass(scan);
System.out.println("Choose Name:");
Scanner nameIn = new Scanner(System.in);
String name = nameIn.next();
Character hero = null;
switch (chosenClass){
case "Fighter":
hero = new Fighter(name);
break;
case "Rogue":
hero = new Rogue(name);
break;
case "Mage":
hero = new Mage(name);
break;
case "Cleric":
new Cleric(name);
break;
case "def":
System.out.println("Wrong input");
}
return hero;
}
public static String getCharacterClass(int scan){
String classIn;
switch (scan) {
case 1:
classIn = "Fighter";
break;
case 2:
classIn = "Rogue";
break;
case 3:
classIn = "Mage";
break;
case 4:
classIn = "Cleric";
break;
default:
System.out.println("Enter again");
classIn = "def";
}
return classIn;
}
}
public class Character {
private String name;
private String characterClass;
private int level;
private int hp;
private int currentHp;
private int armorClass;
private long xp;
/*private int BAB; /*Base attack bonus*/
private int strength;
private int constitution;
private int dexterity;
private int intelligence;
private int wisdom;
private int charisma;
protected Character(String name){
setName(name);
setCharacterClass("Class");
setLevel(1);
setStrength(10);
setConstitution(10);
setDexterity(10);
setIntelligence(10);
setWisdom(10);
setCharisma(10);
setHp(0);
setCurrentHp(getHp());
setArmorClass(10);
setXp(0);
}
void displayCharacter() throws IOException {
System.out.print("\n\n\n");
System.out.println("Name: " + getName());
System.out.println("Class: " + getCharacterClass());
System.out.println("Level: " + getLevel());
System.out.println("HP: " + getHp());
System.out.println("Current HP: " + getCurrentHp());
System.out.println("Armor Class: " + getArmorClass());
System.out.println("***************");
System.out.println("Attributes: ");
System.out.println("Strength: " + getStrength());
System.out.println("Constitution: " + getConstitution());
System.out.println("Dexterity: " + getDexterity());
System.out.println("Intelligence: " + getIntelligence());
System.out.println("Wisdom: " + getWisdom());
System.out.println("Charisma: " + getCharisma());
System.out.println("***************");
System.out.println("XP: " + getXp());
}
public int getModifier(int number){
int mod = (int)((number -10)/2);
return mod;
}
public String getName() { return name; }
public String getCharacterClass() { return characterClass; }
public int getLevel() { return level; }
public int getHp() { return hp; }
public int getCurrentHp() { return currentHp; }
public int getArmorClass() { return armorClass; }
public int getStrength(){ return strength; }
public int getConstitution(){ return constitution; }
public int getDexterity(){ return dexterity; }
public int getIntelligence(){ return intelligence; }
public int getWisdom(){ return wisdom; }
public int getCharisma(){ return charisma;}
public long getXp(){ return xp;}
protected void setName(String Name) { name = Name; }
protected void setCharacterClass(String characterClass) { this.characterClass = characterClass; }
protected void setLevel(int lvl){ level = lvl; }
protected void setHp(int hitPoints){ hp = hitPoints; }
protected void setCurrentHp(int curHp){ currentHp = curHp; }
protected void setArmorClass(int ac){ armorClass = ac; }
protected void setStrength(int str){ strength = str; }
protected void setConstitution(int con){ constitution = con; }
protected void setDexterity( int dex) { dexterity = dex; }
protected void setIntelligence(int intel){ intelligence = intel; }
protected void setWisdom(int wis){ wisdom = wis; }
protected void setCharisma(int cha){charisma = cha; }
protected void setXp(int XP){xp = XP; }
}
public class Fighter {
Fighter(String name){
Character hero = new Character(name);
hero.setName(name);
hero.setCharacterClass("Fighter");
hero.setLevel(1);
hero.setStrength(14);
hero.setConstitution(16);
hero.setDexterity(14);
hero.setIntelligence(10);
hero.setWisdom(10);
hero.setCharisma(10);
hero.setHp((int) (10 + hero.getModifier(hero.getConstitution())));
hero.setHp(10);
System.out.println("hero.getconst(): " + hero.getConstitution());
System.out.println("hero.getModifier(getConstitution(): " + hero.getModifier(hero.getConstitution()));
hero.setCurrentHp(hero.getHp());
hero.setArmorClass(10 + hero.getModifier(hero.getDexterity()));
}
}
答案 0 :(得分：0)
类Figter被声明为
public class Fighter {
所以不从Character类扩展。所以战斗机不是一个角色。
然而CharacterCreator类有以下方法：
public static Character createCharacter() {
// ...
switch (chosenClass){
case "Fighter":
hero = new Fighter(name);
break;
// ...
}
return hero;
}
所以你试图从一个必须返回一个角色的方法中返回一个战斗机。战斗机不是角色。因此错误信息。
答案 1 :(得分：0)
我希望得到一个角色类（比如战士）作为输入，并根据所选择的角色类（如战士）创建一个角色，并具有预定的统计数据/能力。
在Character中创建一个静态战斗机创建者方法（以访问受保护的setXxxx（）方法），创建一个新的Character实例，并覆盖所需的统计数据。
class Character {
public static Character createFighter(String name) {
Character hero = new Character(name);
hero.setStrength(14);
hero.setCharacterClass("Fighter");
hero.setStrength(14);
hero.setConstitution(16);
hero.setDexterity(14);
hero.setHp((int) (10 + hero.getModifier(hero.getConstitution())));
hero.setCurrentHp(hero.getHp());
hero.setArmorClass(10 + hero.getModifier(hero.getDexterity()));
return hero;
}
}
或者，将字符类传递给Character构造函数：
class Character {
public Character(String name, String charClass) {
// Initialize defaults
setStrength(10);
setIntelligence(10);
// etc
switch(charClass) {
case "Fighter":
setStrength(14);
// ... other overrides for Fighter
break;
case "Cleric":
// etc
}
}
}
但是，如果要对字符类进行多次检查，则应使用枚举。然后你甚至可以在枚举类中放入初始统计数据。请参阅https://docs.oracle.com/javase/tutorial/java/javaOO/enum.html，尤其是Planet示例。