java - 如何访问由构造函数创建的对象变量

Question

我有 2 个按钮，其中 1 个使用 round1rock 中的构造函数类，而另外 1 个则尝试访问这些参数。我的代码有什么问题吗？

构造函数类

public ROCK(int hp, int stamina, int attack, int speed, String type){
   this.hp=hp;  
   this.stamina= stamina;
   this.attack= attack;
   this.speed = speed;
   this.type = type;
}

2 个按钮:

private void continueRound1 (ActionEvent event){
       ROCK round1Rock= new ROCK( 500, 100, 100, 100, "Metamorphic");
    }
    private void Attack (ActionEvent event){
        round1Rock.hp = 12;

    }

如何访问之前创建的对象？

Answer 1

当你定义

private void continueRound1 (ActionEvent event){
   ROCK round1Rock= new ROCK( 500, 100, 100, 100, "Metamorphic");
}

您仅为函数 continueRound1 定义 ROCK round1Rock。 为了让 Attack 访问该对象，您需要在类级别定义 round1Rock。

尝试:

ROCK round1Rock = null;

private void continueRound1 (ActionEvent event){
  round1Rock= new ROCK( 500, 100, 100, 100, "Metamorphic");
}
private void Attack (ActionEvent event){
    round1Rock.hp = 12;

}