Question

我目前正在对游戏进行编码，其中一个敌人（一只蝙蝠）应该有健康下降，但它不起作用。

class BatTest{
public static void main(String args[]) {
    String input = "";
    boolean exit = false;
    Bat bat1 = new Bat();
    Inventory MainInv = new Inventory();
    MainInv.smallknife = true;
    System.out.println("A bat has appeared!");
    System.out.println("Health: " + bat1.health + " Attack Strength: " + bat1.damage);
    do{
        System.out.println("Health: " + bat1.health + " Attack Strength: " + bat1.damage);
        System.out.print("What would you like to do: ");
        input = Keyboard.readString();
        if (input.equalsIgnoreCase("Attack")) {
            Abilities.smallknifeMA(bat1.health);
            System.out.println(bat1.health);
        }
        else if (input.equalsIgnoreCase("exit")) {
            exit = true;
        }
    }while(!exit);
}

}

//enemyH denotes the health of the enemy

class Abilities {
static double smallknifeMA(double enemyH) {
    enemyH = enemyH - 2.0;
    return enemyH;
}

}

class Inventory {
boolean smallknife;
boolean startlockerkey;

}

我无法理解为什么smallknifeMA不会降低变量bat1.health。

谢谢，极光

Answer 1

Java不是通过引用传递的。此

Abilities.smallknifeMA(bat1.health);

需要更新bat1.health。像，

bat1.health = Abilities.smallknifeMA(bat1.health);

或者，修改smallknifeMA以获取Bat参数并直接更新health。像，

static void smallknifeMA(Bat bat) {
    bat.health -= 2.0;
}

然而，让您的班级成员public成为一种不好的做法;你应该在Bat中封装这种行为。

尝试更改变量的Java方法不起作用

1 个答案: