扫描仪，不匹配？

Question

我正在尝试使用扫描仪来创建对象。我只是想，我可以在编译之后创建一个对象吗？或者我事先做过吗？

所以我问一个问题，然后运行扫描仪。之后，我尝试使用扫描仪中的String创建一个对象。这可能吗？以下是可能或不重要的代码：

import java.util.Scanner;

public class CreateCharacter{
    public static Scanner input = new Scanner( System.in );
    public static String race;
    public static String name;

    public static String askRace(){
        System.out.println();
        System.out.println("What race do you want to be?");
        System.out.print("(");
        Character.getAllRaces();
        System.out.println(")");
        race = input.next();
        System.out.println();   

        return race;    
    }

    public static String askName(){
        System.out.println();
        System.out.println("What is your Name?");
        name = input.next();
        System.out.println();   

        return name;    
    }

    public static void askCharDeets(){
        askName();
        askRace();
        input.close();
    }


    public static void main(String[] arguments){
        askCharDeets();
        Character c1 = new Character(name, race);
        //c1.Stats();
    }
}

和

import java.util.HashMap;

public class Character extends Creature{
    public static String[] races = {"Human", "Elf", "Dwarf", "Gnome"};
    int hp;
    int mp;
    int spd;
    int ac;

    public Character(String charName, String race){
        name = charName;
        info = new HashMap<String, String>();
        stats = new HashMap<String, Integer>();

        info.put("Name", name);
        info.put("Gender", "Male");
        stats.put("Level", 1);
        for(int i = 0; i < races.length; i++){
            if(race == races[0]){
                info.put("Race", races[0]);
                stats.put("Fortitude", 9);
                stats.put("Willpower", 9);
                stats.put("Dexterity", 9);
                stats.put("Strength", 9);
                otherStats();
                break;
            }else if(race == races[1]){
                info.put("Race", races[1]);
                stats.put("Fortitude", 7);
                stats.put("Willpower", 11);
                stats.put("Dexterity",9);
                stats.put("Strength", 9);
                otherStats();
                break;
            }else if(race == races[2]){
                info.put("Race", races[2]);
                stats.put("Fortitude", 11);
                stats.put("Willpower", 7);
                stats.put("Dexterity", 9);
                stats.put("Strength", 9);
                otherStats();
                break;
            }else if(race == races[3]){
                info.put("Race", races[3]);
                stats.put("Fortitude", 9);
                stats.put("Willpower", 9);
                stats.put("Dexterity", 11);
                stats.put("Strength", 7);
                otherStats();
                break;
            }else{

                System.out.println(race + " is not a valid Race Type for " + name+ ".");
                break;
            }
        }   
    }

    void otherStats(){
        hp = stats.get("Fortitude") + stats.get("Level");
        mp = stats.get("Willpower") + stats.get("Level");
        spd = stats.get("Dexterity") + stats.get("Level");
        ac = stats.get("Fortitude")/2 + stats.get("Level");

        stats.put("Mana Points", 9);
        stats.put("Hit Points", hp);
        stats.put("Speed", 11);
        stats.put("Armor Class", 7);
    }

    public void Stats(){
        System.out.println("-"+name+"-");
        System.out.println("Race " + info.get("Race"));
        System.out.println("Class " + info.get("Class"));
        System.out.println("Level " + stats.get("Level"));
        System.out.println("---");
        System.out.println("Hit Points " + stats.get("Hit Points"));
        System.out.println("Mana Points " + stats.get("Mana Points"));
        System.out.println("Speed " + stats.get("Speed"));
        System.out.println("Armor Class " + stats.get("Armor Class"));
        System.out.println("---");
        System.out.println("Fortitude " + stats.get("Fortitude"));
        System.out.println("Willpower " + stats.get("Willpower"));
        System.out.println("Dexterity " + stats.get("Dexterity"));
        System.out.println("Strength " + stats.get("Strength"));        
    }

    public static void getAllRaces(){
        for(int i = 0; i < races.length; i++){
            if(i < races.length - 1){
                System.out.print(races[i]+ ", ");
            }else if(i == races.length - 1){
                System.out.print(races[i]);
            }
        }
    }
}

奇怪的是，它不是java错误，而是打印出race + " is not a valid Race Type for " + name+ "." ...

Answer 1

使用race.equals(races[0])代替race == races[0]

equals函数检查字符串的实际内容，==运算符检查对象的引用是否相等。

请参阅this和this问题以获得正确的解释。