java - 奇怪的运行时错误声明类 Java 的实例

Question

我正在用 Java 制作游戏，并且始终遇到最奇怪的错误。我有一类叫做武器。然后我创建了一个名为 primary 的实例。在我创建一个实例并将其称为次要实例之后。由于一些奇怪的原因，主要的被次要的值覆盖。我和导师都看了，想不通。这是代码:

public class weapon {
        static String type;
        static String name;
        static int weight;
        static int damage;
        static int dodge;
        weapon(String c, String n, int w, int da, int dod) {

                type = c;
                name = n;
                weight = w;
                damage = da;
                dodge = dod;

        }
        //getters
        String getType(){
                return type;
        }
        String getName(){
                return name;
        }
        Integer getWeight(){
                return weight;
        }
        Integer getDamage(){
                return damage;
        }
        Integer getDodge(){
                return dodge;
        }
        //setters
        void setType(String c){
                c=type;
        }
        void setName(String n){
                n=name;
        }
        void setWeight(Integer w){
                w=weight;
        }
        void setDamage(Integer da){
                damage=da;
        }
        void setDodge(Integer dod){
                dodge=dod;
        }
}

/*At the top of my main class I create both instances like this because the instances are created in if statements and I need to access them.*/
weapon primary;
weapon secondary;
//I create primary like this earlier in the code like this
primary = new weapon("primary","sword", 8, 6, -1);
//and then when I run this I get the output "sword" "Heavy Sword".
System.out.println(primary.getName());
secondary = new weapon("secondary", "huge sword", 9, 7, -2);
System.out.println(primary.getName());

Answer 1

你所有的成员变量都定义为静态的:

    static String type;
    static String name;
    static int weight;
    static int damage;
    static int dodge;

这就是为什么第二个实例的值会覆盖第一个实例的原因(因为静态成员是类可验证对象 - 在类的所有实例中都有一个副本)。

删除 static 关键字将解决问题。