Java:读取每行只有第一个单词的.csv文件

Question

我正在尝试将一个 .csv 文件读入一个数组，该数组包含文件中每一行的第一个索引。

我要实现的只是每行的第一个字，而不是像下图那样:

Bonaqua
California
Gallardo
City
Skyline

下面是我的读文件类:

import java.io.File;
import java.util.Scanner;
import javax.swing.JOptionPane;

public class readfile {

    private Scanner s;

    public void openFile() {
        try {
            s = new Scanner(new File(readpath.a));
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null, "File not found!");
        }
    }

    public void readFile() {

        String read = "";

        while (s.hasNextLine()) {
            read += s.nextLine() + "\n";
        }

        String menu[] = read.split("\n");
        Object[] selectionValues = menu;
        String initialSelection = "";

        Object selection = JOptionPane.showInputDialog(null,
                "Please select the Topic.", "Reseach Forum Menu",
                JOptionPane.QUESTION_MESSAGE, null, selectionValues,
                initialSelection);

        JOptionPane.showMessageDialog(null, "You have choosen "
                        + selection + ".", "Reseach Forum Menu",
                JOptionPane.INFORMATION_MESSAGE);

        if (selection == null) {
            JOptionPane.showMessageDialog(null, "Exiting program...",
                    "Research Forum Menu", JOptionPane.INFORMATION_MESSAGE);
            System.exit(0);
        }
    }

    public void closeFile() {
        s.close();
    }
}

Answer 1

将 s.nextLine() 更改为 s.nextLine().split(",")[0]