Java - 将静态 arrayList 从一个类复制到另一个类中的 HashMap

Question

这个问题真的非常简单，但我不知道为什么 stackoverflow 中类似问题的建议解决方案在我的代码中不起作用。

我在MeleeWeapon类中有一个静态meleeWeaponList列表，我想将列表的内容复制到另一个类(Blacksmith)中的HashMap(键)。问题可能出在铁匠课的最后三行。我应该解决什么问题？非常欢迎任何有关如何处理数据的建议

public class  MeleeWeapon extends Weapon {

boolean throwable;

MeleeWeapon(String name,boolean oneHaned, String reqTraining, int n, int dice, int attackBonus, int damageBonus,double weight, long cost, boolean throwable) {
    super(name, weight, cost, oneHaned, reqTraining, n, dice, attackBonus, damageBonus);
    this.throwable = throwable;
}

static List<MeleeWeapon> meleeWeaponList = new ArrayList<MeleeWeapon>();

static
{
    meleeWeaponList.add(new MeleeWeapon("Long Sword",true, "Martial", 1, 8, 0, 0,8, 10, false));
    meleeWeaponList.add(new MeleeWeapon("Short Sword",true, "Martial", 1, 6, 0, 0,5, 5, false));
    meleeWeaponList.add(new MeleeWeapon("Dagger",true, "Basic", 1, 4, 0, 0,2, 3, true));
    meleeWeaponList.add(new MeleeWeapon("Quarter-staff",false, "Basic", 1, 4, 0, 0,3, 2, false));
    meleeWeaponList.add(new MeleeWeapon("Shield",false, "Martial", 1, 4, 0, 0,8, 8, false));

}


public void attack(Character attacker, Character defender){

    int attackRoll = DiceRoller.roll(20) + attacker.getBaseAttackBonus() + attacker.getModifier(attacker.getStrength()) + getAttackBonus() ;
    System.out.println(attacker.getName() + " attack Roll: " + attackRoll + "AC: " + defender.getArmorClass());

    if (attackRoll >= defender.getArmorClass()){
        System.out.println("Defender: " + defender.getName() + " had " + defender.getCurrentHp());
        int damage = DiceRoller.roll(getN(), getDice()) + attacker.getModifier(attacker.getStrength()) + getDamageBonus() ;
        System.out.println("Damage : " + damage);
        defender.setCurrentHp(attacker.getCurrentHp() - damage);
        System.out.println("Defender: " + defender.getName() + " has " + defender.getCurrentHp());
    } else {
        System.out.println("Missed Attack");
    }

}

public static  MeleeWeapon getItem(String itemName) {
    try {
        for (Iterator<MeleeWeapon> iter = meleeWeaponList.iterator(); iter.hasNext(); ) {
            MeleeWeapon item = iter.next();
            if (itemName.equals(item.getName())) {
                return item;
            }
        }

    } catch (Exception e){
        System.out.println(itemName + " haven't been found");
        return null;
    }
    return null;
}


}



public class Blacksmith {

private Map<MeleeWeapon,Integer> meleeMap;
private Map<RangedWeapon,Integer> rangedMap;
private Map<Armor,Integer> armorMap;

Blacksmith(){

    meleeMap = new HashMap<MeleeWeapon, Integer>();
    rangedMap = new HashMap<RangedWeapon, Integer>();
    armorMap = new HashMap<Armor, Integer>();
}

List<MeleeWeapon> meleeList = MeleeWeapon.meleeWeaponList;

for (MeleeWeapon weapon : meleeList) {
    meleeMap.put(weapon, 5);
}



}

Answer 1

您需要根据需要将以下语句放入方法或构造函数或某个静态 block 中，这样就可以了。

List<MeleeWeapon> meleeList = MeleeWeapon.meleeWeaponList;

for (MeleeWeapon weapon : meleeList) {
    meleeMap.put(weapon, 5);
}