Question

我正在制作一个线程应用程序，主类也是可运行的类。出于某种原因，我的主题不会开始。任何想法为什么？ updateThread是罪魁祸首......

这是代码：

package avtech.software.bitprice.display;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

import avtech.software.bitprice.dialogs.*;
import avtech.software.bitprice.listeners.*;

@SuppressWarnings("serial")
public class Display extends JFrame implements Runnable {

    /**
     * variables
     */
    private static final int WIDTH = 200, HEIGHT = 200;
    private static double currentPrice = 0.0;
    private static double pauseLength;
    private static boolean running = false;
    private static String greaterLess = "";
    /**
     * objects
     */
    private static Display d;
    private static Thread updateThread;
    private static JLabel currentPriceLabel = new JLabel("Current Price: $" + currentPrice);
    private static JTextField pullDelayArea = new JTextField("Price Pull Delay In Minutes...");
    private static JTextField priceValueArea = new JTextField("Price You Are Waiting For...");
    private static JButton update = new JButton("UPDATE DATA");

    public Display() {
        running = true; // program is now running
        updateThread = new Thread(d); // create the local thread

        /**
         * create the frame
         */
        setLayout(null);
        setSize(WIDTH, HEIGHT);
        setResizable(false);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setTitle("BitPrice");

        /**
         * set bounds of the components
         */
        currentPriceLabel.setBounds(((WIDTH / 2) - (currentPriceLabel.toString().length() / 5)), 5, WIDTH, 50);
        pullDelayArea.setBounds(10, 40, WIDTH - 25, 25);
        priceValueArea.setBounds(10, 70, WIDTH - 25, 25);
        update.setBounds(10, 100, WIDTH - 25, 25);

        /**
         * set up the listeners to the components
         */
        pullDelayArea.addMouseListener(new PullDelayAreaListener(pullDelayArea));
        pullDelayArea.addActionListener(new PullDelayAreaListener(pullDelayArea));
        priceValueArea.addMouseListener(new PriceValueAreaListener(priceValueArea));
        priceValueArea.addActionListener(new PriceValueAreaListener(priceValueArea));
        update.addActionListener(new UpdateButtonListener());

        /**
         * add everything
         */
        add(currentPriceLabel);
        add(pullDelayArea);
        add(priceValueArea);
        add(update);

        setLocationRelativeTo(null);
        setVisible(true);
        requestFocus();

        /**
         * start the update process
         */
        System.out.println("hi");
        updateThread.start();
    }

    /**
     * everything that happens when the thread is updated, including updating
     * the price label, and all that good stuff :)
     */
    public static void update() {
        /**
         * make sure that there is data in the boxes taht is valid
         */
        if (pullDelayArea.getText().equals("Price Pull Delay In Minutes...") || pullDelayArea.getText().equals("")) {
            new MessageDialog(d, "Please enter a valid number into Price Pull Delay.");
        }
        if (priceValueArea.getText().equals("Price You Are Waiting For...") || priceValueArea.getText().equals("")) {
            new MessageDialog(d, "Please enter a valid number into Price Value.");
        }

        // set the new price double from the website

        // update the label
        currentPriceLabel.setText("Current Price: $" + currentPrice);
        currentPriceLabel.setBounds(((WIDTH / 2) - (currentPriceLabel.toString().length() / 5)), 5, WIDTH, 50);
        currentPriceLabel.repaint();

        /**
         * check to see if the current value is what the client is waiting for
         */
        String priceValueString = priceValueArea.getText();
        double priceValue = Double.parseDouble(priceValueString);

    }

    /**
     * this thread is checking the price of the Bitcoin, and will send out the
     * notification if it reaches a certain price
     */
    public void run() {
        System.out.println("started");
        /**
         * initial pause, letting the client get all set up
         */
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            new ErrorDialog(this, "Error delaying the pull request. Please restart client.");
        }
        System.out.println("started");
        while (running) {
            update();

            /**
             * add a pause to not just destroy internet speeds, pause settable
             * through the GUI
             */
            try {
                Thread.sleep((long) (pauseLength * 1000000)); // 1 million cause
                                                                // its in
                // milliseconds
            } catch (InterruptedException e) {
                new ErrorDialog(this, "Error delaying the pull request. Please restart client.");
            }
        }
    }

    public static void main(String[] args) {
        d = new Display();
    }
}

非常感谢任何帮助。

PS：我的互联网即将关闭，因此回复可能会延迟到明天。

Answer 1

简短版本是在构造函数退出之前不会设置对d的引用，因此在Display中，您将创建一个新的线程对象并将静态引用传递给{{1那时仍然是null。我会从构造函数中删除d行和new Thread(d)行，只需从main方法中调用.start()。

为什么不是我的线程开始？

1 个答案: