java - 如何从文本文件读取到JLabel或JTextArea？

Question

我正在尝试创建一个如下所示的弹出窗口:

玩过的游戏数量:2
总分:10
平均分:5

我将数字 2、10 和 5 存储在文本文件中。我只是希望能够将文本文件中的数字读取到 JLabel 或 JTextArea(这就是我感到困惑的地方)？我还希望能够清除分数并将其全部重置为 0。我认为这应该不会太难，但我可能是错的。当我读入数字时，我应该将它们存储到 ArrayList 中吗？

这是我到目前为止的代码:

import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.util.Scanner;

public class HistoryPopUp {

    JFrame history;
    JPanel panel;
    JLabel numGames, totalScore, avgScore;
    JTextArea games,score,aScore;
    JButton clearHistory;

    HistoryPopUp(){
        history = new JFrame();
        panel = new JPanel(new GridLayout(3, 1));
        numGames = new JLabel("Number of Games Played: ");
        totalScore = new JLabel("Total Score: ");
        avgScore = new JLabel("Average Score: ");
        games = new JTextArea();
        score = new JTextArea();
        aScore = new JTextArea();


        clearHistory = new JButton();

        try {
            String textLine;
            FileReader fr = new FileReader("history.txt");
            BufferedReader reader = new BufferedReader(fr);
            while((textLine=reader.readLine()) != null){
                textLine = reader.readLine();
                games.read(reader,"Something");
                score.read(reader, "seomthing");
                aScore.read(reader,"balh");
            }

            reader.close();

        }catch(IOException ex){
                System.out.println("ABORT! YOU KILLED IT!!");
            }

        history.pack();
        history.setVisible(true);

        panel.add(games);
        panel.add(score);
        panel.add(aScore);

        JOptionPane.showMessageDialog(null, panel, "History of Games Played", JOptionPane.PLAIN_MESSAGE);

    }
}

编辑:格式

Answer 1

您遇到的问题是您有 4 段代码都试图从同一个数据池中读取数据，score 或 aScore 不太可能有任何数据游戏结束后读取器中的数据

如果您只想使用JLabel，您可以这样做......

String[] headers = {"Number of Games Played:", "Total Score:", "Average Score:"};
JLabel[] labels = new JLabel[3];
for (int index = 0; index < labels.length; index++) {
    labels[index] = new JLabel();
    // Add label to screen
}

try (BufferedReader br = new BufferedReader(new FileReader(new File("history.txt")))) {
    String text = null;
    int lineCount = 0;
    while ((text = br.readLine()) != null && lineCount < 3) {
        System.out.println(text);
        labels[lineCount].setText(headers[lineCount] + " " + text);
        lineCount++;
    }
} catch (IOException ex) {
    ex.printStackTrace();
}

如果你想使用JTextArea，你可以这样做......

String[] headers = {"Number of Games Played:", "Total Score:", "Average Score:"};
JTextArea textArea = new JTextArea(3, 20);
// Add text area to container

try (BufferedReader br = new BufferedReader(new FileReader(new File("history.txt")))) {
    String text = null;
    int lineCount = 0;
    while ((text = br.readLine()) != null && lineCount < 3) {
        System.out.println(text);
        textArea.append(headers[lineCount] + " " + text + "\n");
        lineCount++;
    }
} catch (IOException ex) {
    ex.printStackTrace();
}

您还可以以类似的方式使用 JTextField 数组