java - 更改类之间的 JLabels

Question

我的第一篇文章，所以请原谅任何不正确的礼仪。我目前正在为学校做年终项目，我需要一些帮助。我正在 Netbeans 中制作一个 GUI java 应用程序。我有两个类。一个是控制计时器的类，另一个是记分板屏幕的类。我需要用timerClass 中倒计时的时间来更新记分板timerLabel。它非常困惑，因为 Timer 类中有另一个计时器标签它会更新。我的问题是我无法更新 MatchScreen() 中的timerLabel。这是我的代码:

定时器类

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

public class TimerClass extends JFrame {

    Timer timer;
    JLabel promptLabel, timerLabel;
    int counter;
    JTextField tf;
    JButton button;
    MatchScreen call = null;

    public TimerClass() {
        call = new MatchScreen();
        setLayout(new GridLayout(4, 4, 7, 7));
        promptLabel = new JLabel(""
                + "Enter number of seconds for the timer", 
                SwingConstants.CENTER);
        add(promptLabel);
        tf = new JTextField(5);
        add(tf);
        button = new JButton("Start");
        add(button);
        timerLabel = new JLabel("waiting...", 
                SwingConstants.CENTER);
        add(timerLabel);

        event e = new event();
        button.addActionListener(e);
        System.out.println("Button pressed");
    }

    public class event implements ActionListener {

        public void actionPerformed(ActionEvent e) {
            System.out.println("Action performed");
            int count = (int) (Double.parseDouble(tf.getText()));
            timerLabel.setText("Time left: " + count);
            call.setTimerLabel(count);
            System.out.println("Passed count to tc");
            TimeClass tc = new TimeClass(count);
            timer = new Timer(1000, tc);
            System.out.println("Timer.start");
            timer.start();
            //throw new UnsupportedOperationException("Not supported yet.");
        }

        /*public void actionPerformed(ActionEvent e) {
        throw new UnsupportedOperationException("Not supported yet.");
        }*/
    }

    public class TimeClass implements ActionListener {

        int counter;

        public TimeClass(int counter) {
            this.counter = counter;
        }

        public void actionPerformed(ActionEvent e) {
            counter--;
            if (counter >= 1) {
                call.setTimerLabel(counter);
            } else {
                timerLabel.setText("END");
                timer.stop();
                Toolkit.getDefaultToolkit().beep();
            }
        }
    }

    public static void main(String args[]) {
        TimerClass gui = new TimerClass();
        gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        gui.setSize(250, 150);
        gui.setTitle("Time Setup");
        gui.setVisible(true);
    }
}

现在是记分板屏幕

public class MatchScreen extends javax.swing.JFrame {

    int redScore = 0, blueScore = 0, blueCat1 = 0,
            blueCat2 = 0, redCat1 = 0, redCat2 = 0, winner = 0;

    public MatchScreen() {
        initComponents();
    }

    //Determine Winner of the match
    public int getWinner() {
        if (redScore > blueScore) {
            winner = 1;
        } else {
            winner = 2;
        }
        return winner;
    }

    public void setTimerLabel(int a) {
        int time = a;
        while (time >= 1) {
            timerLabel.setText("" + time);
        }
        if (time < 1) {
            timerLabel.setText("End");
        }
    }

    private void jButton13ActionPerformed(java.awt.event.ActionEvent evt) {
        //Creates an object of the timerClass
        TimerClass gui = new TimerClass();
        gui.setSize(300, 175);
        gui.setTitle("Time Setup");
        gui.setVisible(true);
    }
}

MatchScreen() 中省略了一些我认为不相关的代码。

非常感谢

Answer 1

设法解决一般问题。我将所有代码放入一个类中。不理想，但它有效:/无论如何，最后期限迫在眉睫。

真诚的感谢。