Question

目的是将团队添加到arraylist。每个团队都是一个具有String名称，String division，int wins和int loss的对象。

import java.util.ArrayList;
import java.util.Arrays;
public class Default 
{
     ArrayList<team> teams = new ArrayList<team>();
     team Mavericks = new team("Mavericks","Southwest",50,32);
     team Rockets = new team("Rockets","Southwest",56,26);
     team Grizzlies = new team("Memphis","Southwest",55,27);
     teams.add(team Mavericks);
     teams.add(team Rockets);
     teams.add(team Grizzlies);
}
class team
{
    String name, division;
    int win,loss;
    public team(String n,String d, int w, int l)
    {
        this.name = n;
        this.division = d;
        this.win = w;
        this.loss = l;
    }

}

Answer 1

它

 teams.add(team Mavericks);
 teams.add(team Rockets);
 teams.add(team Grizzlies);

应该是

 teams.add(Mavericks);//here Mavericks is an object
 teams.add(Rockets);
 teams.add(Grizzlies);

Answer 2

您的代码存在多个问题：

class Default中的所有内容都应位于方法内。可能你想在main()中做到这一点。类似的东西：

public class Default
{
    public static void main(String[] args){
      ArrayList<team> teams = new ArrayList<team>();
      team Mavericks = new team("Mavericks","Southwest",50,32);
      team Rockets = new team("Rockets","Southwest",56,26);
      team Grizzlies = new team("Memphis","Southwest",55,27);
      teams.add(team Mavericks);
      teams.add(team Rockets);
      teams.add(team Grizzlies);
    }
}

teams.add(team Mavericks);无法编译。您需要添加Arraylist，如：
```
teams.add(Mavericks);
teams.add(Rockets);
teams.add(Grizzlies);
```
根据java命名约定，team类应命名为Team。变量名称应为mavericks，rockets，memphis，而不是Mavericks，Rockets，Memphis。

Answer 3

首先，你不能直接从类的主体调用函数。你应该把它放在构造函数中，例如

public class Default 
{
     ArrayList<team> teams = new ArrayList<team>();
     team Mavericks = new team("Mavericks","Southwest",50,32);
     team Rockets = new team("Rockets","Southwest",56,26);
     team Grizzlies = new team("Memphis","Southwest",55,27);
     public void Default()
     {
         teams.add(team Mavericks);
         teams.add(team Rockets);
         teams.add(team Grizzlies);
     }
}

此外，您应该将team从调用中删除到teams.add，以便它们成为：

teams.add(Mavericks);
teams.add(Rockets);
teams.add(Grizzlies);

我还要坚持使用大写字母和带小写字母的实例来启动类名的Java风格，例如： Maverick应该变为maverick而team应变为Team。对于标识符引用类和实例的其他人来说，这将更加明显。您可以在Code Conventions了解更多相关信息。

如何将对象添加到对象的arraylist中

3 个答案: