Question

我有一个程序，将CSV文件中的数据放入ArrayList。在用户菜单上，用户将首先按1来执行此操作，即从CSV文件中调用数据并将其放入ArrayList，然后按2以便控制台向用户显示哪些数据是存储

如何执行选项2？

这是我的菜单：

public class Main {
    public static void main(String args[]){
        SimpleCarFactory factory = SimpleCarFactory.getInstance();
        CarStore store = new CarStore(factory);
        Car     Vauxhall = store.createCar("Vaux");
        Car Volvo = store.createCar("Vol");

        Scanner input = new Scanner(System.in);        
        int choice;
        do
        {   
            userInput();
            choice = input.nextInt();
            switch(choice)                  
            {
            case 1:      
                vauxhall.getData();
                System.out.println("Data for " + vauxhall.getName() + " car loaded successfully");
                volvo.getData();
                System.out.println("Data for " + vol.getName()  + " car loaded successfully");
                break;                      
            case 2:                     
                System.out.println(vauxhall.getData());
                System.out.println(vauxhall.getData());
            case 0:
                System.out.println("BYE");
                System.exit(0); 
                break;                      
            }
            System.out.println();                   
        }while(choice !=0);
        input.close();
    }
}

这是我的Car类：

public class Car {
    static String name;
    static FileParser fileParser = null;

    ArrayList data = new ArrayList();

    public String getName() {
        return name;
    }

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

    public ArrayList getData() {
        return data;
    }

    public void setData(ArrayList data) {
        this.data = data;
    }

    public Card(String name) {
        super();
        this.name = name;
    }
}

这是我的一个汽车子类：

public class Vauxhall extends Car {
    public Vauxhall(String name) {
        super(name);
        // TODO Auto-generated constructor stub
    }
    static FileParser fileParser = null;

    public ArrayList getData() {
        fileParser  = new FileParser();
        ArrayList<String> data =  fileParser.parseFile("filepath.csv");
        List<Vauxhall> VauxhallList = fileParser.populateData(data);

        return data;
    }
}

Answer 1

只需存储数据arraylists，并在case 2中使用它们（我还添加了一个缺少的break语句）：

ArrayList vauxhallData = null;
ArrayList volvoData = null;

switch(choice)                  
            {
            case 1:      
                vauxhallData = vauxhall.getData();
                System.out.println("Data for " + vauxhall.getName() + " car loaded successfully");
                volvoData = volvo.getData();
                System.out.println("Data for " + vol.getName()  + " car loaded successfully");
                break;                      
            case 2:                     
                System.out.println(vauxhallData);
                System.out.println(volvoData);
                break;
            case 0:
                System.out.println("BYE");
                System.exit(0); 
                break;                      
            }

如何在控制台菜单上调用数组中的数据？

1 个答案: