我正在尝试将新创建的对象添加到类的构造函数中的 ArrayList 中。新对象正在 main 方法的另一个类中创建。
主要方法：
public static void main(String[] args) {
// TODO code application logic here
Player p1 = new Player("Peter");
}
我的播放器类：
public class Player {
protected static int age;
protected static String name;
protected static ArrayList players = new ArrayList();
Player(String aName) {
name = aName;
age = 15;
players.add(new Player()); // i know this doesn't work but trying along these lines
}
}
您必须编辑该行
players.add(new Player());
至
players.add(this);
此外，无需将年龄和姓名设为静态
我建议您应该使用以下代码
import java.util.ArrayList;
public class Player {
protected int age; //static is removed
protected String name; // static is removed
protected static ArrayList<Player> players = new ArrayList<Player>(); //this is not a best practice to have a list of player inside player.
Player(String aName) {
name = aName;
age = 15;
players.add(this); // i know this doesn't work but trying along these lines
}
public static void main(String[] args) {
// TODO code application logic here
Player p1 = new Player("Peter");
}
}
听起来您实际上是在询问如何引用您正在构建的实例。
这就是this关键字的作用。
这篇文章很旧，但对于有类似需求的人，我建议这样做：
主类：
public static void main(String[] args) {
//TODO code application logic here
java.util.List<Player> players = new java.util.ArrayList<>(); //list to hold all players
Player p1 = new Player("Peter"); //test player
players.add(p1); //adding test player to the list
players.add(new Player("Peter")); //also possible in this case to add test player without creating variable for it.
}
球员等级：
public class Player {
private final int age = 15; //if you always going to use 15 as a age like in your case it could be final. if not then pass it to constructor and initialize the same way as the name.
private String name;
Player(String name) { //variable name can be the same as one in class, just add this prefix to indicated you are talking about the one which is global class variable.
this.name = name;
}
}
通常，您应该避免在该类的每个实例中应该不同的变量上使用 static 关键字。避免内部有自己的对象。