Java:在外部函数中设置对象变量

Question

    public static void main(String[] args) {

        Player Anfallare = new Player("A");
        Player Forsvarare = new Player("F");
        MotVarandra(Anfallare.getDice(1), Forsvarare.getDice(1));
    (...)
   }

我的主要功能是什么,现在我做了一个自己的功能,

public static void MotVarandra(int a, int f){
    if(f >= a){
        Anfallare.armees-=1;
    }else{
        Forsvarare.armees-=1;
    }
}

应该将对象的变量设置为 - = 1 ..但这不起作用,因为函数不知道Anfallare和Forsvarare是一个对象..

在这种情况下我该怎么办？

Answer 1

您需要将Players 定义为类字段,而不是在main方法内.

为了温和地介绍Java,我建议你在这里开始阅读:

http://download.oracle.com/javase/tutorial/java/index.html

此外,这里有很棒的书籍建议:https://stackoverflow.com/questions/75102/best-java-book-you-have-read-so-far.其中一些书很适合开始学习.

这里的例子:

public class Game {
  private static Player Anfallare, Forsvarare; //  <-- you define them here, so they are available to any method in the class

  public static void main(String[] args) {

    Anfallare = new Player("A");  //  <-- it is already defined as a Player, so now you only need to instantiate it
    Forsvarare = new Player("F");
    MotVarandra(Anfallare.getDice(1), Forsvarare.getDice(1));
    // ...
  }
  public static void MotVarandra(int a, int f){
    if(f >= a){
        Anfallare.armees-=1; //  <-- it is already defined and instantiated
    }else{
        Forsvarare.armees-=1;
    }
  }
}