java - 为数组列表中的每个项目创建对象

Question

我已经学习 java 一个多月了，之前没有 OOP 经验，所以请提供简单的答案!

我正在从事的项目本质上是一个简单的游戏。我获取了一个包含可变数量车辆名称的 txt 文件，并允许用户输入车辆名称，然后输入命令。

如何为数组列表中的每个项目创建一个对象？

这是我目前所做的(我在代码注释中举了一个我正在尝试做的例子):

public class VehicleApp {
public static void main(String[] args) throws FileNotFoundException, IOException{
    File myDir = new File(System.getProperty("user.dir"));
    File myFile = new File(myDir, "vehicleNames.txt");

    FileReader in = new FileReader(myFile);
    BufferedReader br = new BufferedReader(in);

    ArrayList<String> vehicleList = new ArrayList<>();

    int i = 0;
    String line = null;
    while((line = br.readLine()) != null){
        vehicleList.add(line);
        System.out.println(vehicleList.get(i));

        //What I'm essentially trying to accomplish:
        //Vehicle vehicleList.get(i) = new Vehicle();

        i++;
    }

    br.close();


    System.out.println("Enter user input as such:\n" +
            "<vehicle name>, <command>");
}
}

Answer 1

我假设您实际上想将 String 传递给 Vehicle 类，因为无法动态分配变量名:

Vehicle newVehicle = new Vehicle(vehicleList.get(i));

如果您实际上是想为 ArrayList 中的每个项目创建一个新的 Vehicle，您可以按如下方式进行:

for(String s : vehicleList){
    Vehicle newVehicle = new Vehicle(s);
}

上面等价于下面的:

for(int i=0; i<vehicleList.size(); i++){
    Vehicle newVehicle = new Vehicle(vehicleList.get(i));
}

要根据传递给它的字符串识别 Vehicle，您应该在 Vehicle 类中使用 getter，如下所示:

public class Vehicle {
    private String name;

    public Vehicle(String name){
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

现在您可以检查给定的 Vehicle 是否具有匹配的名称!例如:

Vehicle vehicle = new Vehicle("Honda Civic");
if(vehicle.getName().equals("Honda Civic")){
    System.out.println("Match!");
}