如何计算两个物体的年龄差？

Question

我正在学习Java的OOP，我要比较两个对象之间的年龄：

在Java程序方面，我会做：

public static int calculateDifferenceAge(int agePlayer1, int agePlayer2){
      int differenceAge = agePlayer1 - agePlayer2;

      if(differenceAge < 0){
        differenceAge = -differenceAge;
      }
      return differenceAge; 
}

然后

public static void displayDifferenceAge(String namePlayer1, String namePlayer2, int agePlayer1, int agePlayer2){
      System.out.println("Age difference between " + namePlayer1 + " and " + namePlayer2 + " is of" + calculateDifferenceAge(agePlayer1, agePlayer2) + " year(s).");
    }
}

我不明白如何在OOP中创建我的calculateDifferenceAge（）方法？

在我的主文件中我有这样的内容：

List<Player> players = new ArrayList <Player>();
players.add(new Player("Eric", 31, true));
players.add(new Player("Juliette", 27, false));

我坚持我的两种方法：

如何减去2个对象的年龄？

public static int calculateAgeDifference(List <Player> players){

    Player differenceAge = (players.get(0) - players.get(1));

    return differenceAge; 

  }

  public static void displayCalculateAgeDifference(List <Player> players){
    System.out.println(calculateAgeDifference().age);
  }

类播放器

public class Player {

  public String name;
  public int age;
  public boolean sex;

  public Player(String name, int age, boolean sex){
    this.name = name;
    this.age = age;
    this.sex = sex;
  }

Answer 1

您只是在代码中少了一小步。提取名单年龄的步骤应为：

1.-从列表中提取对象

2.-提取该对象（本例中为玩家）的年龄

3.-减去年龄

有一些方法可以做，但我会这样做：

public static int calculateAgeDifference(List<Player> players) {
    int age1= players.get(0).age;
    int age2= players.get(1).age;

    int differenceAge = age1 - age2;

    if(differenceAge < 0){
        differenceAge = -differenceAge;
    }
    return differenceAge;
}

希望这能帮上忙。我所做的是从列表中提取对象播放器：players.get(0)提取列表中的第一个对象，它是一个播放器。现在我有了一个player并且它有一个年龄变量，我必须用player.age提取它。我把那些台阶压塌了，如果你有什么问题，我可以进一步解释

显示方式：

 public static int displayCalculateAgeDifference (List<Player> players){
    String name1= players.get(0).name;
    String name2= players.get(1).name;
    
    //as you know this method return the difference in a number form
    int difference= calculateAgeDifference(players);

    System.out.println("Age difference between " + name1 + " and " + name2 + " is of" + difference + " year(s).");
}