从ArrayList <List> - Java每X秒更新一次JLabel

Question

我有一个简单的Java程序,它读入一个文本文件,用""(空格)分割,显示第一个单词,等待2秒,显示下一个...等...我想在Spring中执行此操作或一些其他的GUI.

关于如何用spring轻松更新单词的任何建议？迭代我的列表并以某种方式使用setText();

我没有运气.我正在使用这种方法在consol中打印我的单词并将JFrame添加到它...在consol中工作得很好,但是输出了无穷无尽的jframe.我在网上找到了大部分内容.

    private void printWords() {
        for (int i = 0; i < words.size(); i++) {
            //How many words?
            //System.out.print(words.size());
            //print each word on a new line...
            Word w = words.get(i);
            System.out.println(w.name);

            //pause between each word.
            try{
                Thread.sleep(500);
            } 
            catch(InterruptedException e){
                e.printStackTrace();
            }
         JFrame frame = new JFrame("Run Text File"); 
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
         JLabel textLabel = new JLabel(w.name,SwingConstants.CENTER);
         textLabel.setPreferredSize(new Dimension(300, 100)); 
         frame.getContentPane().add(textLabel, BorderLayout.CENTER);
        //Display the window. frame.setLocationRelativeTo(null); 
         frame.pack(); 
         frame.setVisible(true);
        }
    }

我有一个用JFrame和JLable创建的窗口,但是,我希望静态文本是动态的,而不是加载一个新的弹簧窗口.我想它闪现一个字,消失,闪现一个字消失.

有关如何更新JLabel的任何建议？什么与重绘()？我画了一个空白.

谢谢!

更新: 在下面的亲切的帮助下,我已经让它正确打印到控制台.这是我的打印方法:

private void printWords() {
            final Timer timer = new Timer(500, null);
            ActionListener listener = new ActionListener() {
                private Iterator<Word> w = words.iterator();
                @Override 
                public void actionPerformed(ActionEvent e) {
                    if (w.hasNext()) {
                        _textField.setText(w.next().getName());
                        //Prints to Console just Fine...
                        //System.out.println(w.next().getName());
                    }
                    else {
                        timer.stop();
                    }
                }
            };
            timer.addActionListener(listener);
            timer.start();

    }

但是,它没有更新标签？我的构造函数看起来像:

public TimeThis() {

    _textField = new JTextField(5);
    _textField.setEditable(false);
    _textField.setFont(new Font("sansserif", Font.PLAIN, 30));

    JPanel content = new JPanel();
    content.setLayout(new FlowLayout());
    content.add(_textField); 

    this.setContentPane(content);
    this.setTitle("Swing Timer");
    this.pack();
    this.setLocationRelativeTo(null);
    this.setResizable(false);
    //_textField.setText("loading...");

}

到达那里......一旦我或者任何人帮助我,我会发布修复,让它发挥作用.再次感谢!

Answer 1

切勿Thread.sleep(int)在Swing Code中使用,因为它会阻止EDT; 更在这里,

使用的结果Thread.sleep(int)是这样的:

当Thread.sleep(int)结束

示例代码:

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.image.BufferedImage;
import java.util.LinkedList;
import java.util.Queue;
import java.util.Random;
import javax.swing.*;
//http://stackoverflow.com/questions/7943584/update-jlabel-every-x-seconds-from-arraylistlist-java
public class ButtonsIcon extends JFrame implements Runnable {

    private static final long serialVersionUID = 1L;
    private Queue<Icon> iconQueue = new LinkedList<Icon>();
    private JLabel label = new JLabel();
    private Random random = new Random();
    private JPanel buttonPanel = new JPanel();
    private JPanel labelPanel = new JPanel();
    private Timer backTtimer;
    private Timer labelTimer;
    private JLabel one = new JLabel("one");
    private JLabel two = new JLabel("two");
    private JLabel three = new JLabel("three");
    private final String[] petStrings = {"Bird", "Cat", "Dog",
        "Rabbit", "Pig", "Fish", "Horse", "Cow", "Bee", "Skunk"};
    private boolean runProcess = true;
    private int index = 1;
    private int index1 = 1;

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                ButtonsIcon t = new ButtonsIcon();
            }
        });
    }

    public ButtonsIcon() {
        iconQueue.add(UIManager.getIcon("OptionPane.errorIcon"));
        iconQueue.add(UIManager.getIcon("OptionPane.informationIcon"));
        iconQueue.add(UIManager.getIcon("OptionPane.warningIcon"));
        iconQueue.add(UIManager.getIcon("OptionPane.questionIcon"));

        one.setFont(new Font("Dialog", Font.BOLD, 24));
        one.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        two.setFont(new Font("Dialog", Font.BOLD, 24));
        two.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        three.setFont(new Font("Dialog", Font.BOLD, 10));
        three.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        labelPanel.setLayout(new GridLayout(0, 3, 4, 4));

        labelPanel.add(one);
        labelPanel.add(two);
        labelPanel.add(three);
        //labelPanel.setBorder(new LineBorder(Color.black, 1));
        labelPanel.setOpaque(false);

        JButton button0 = createButton();
        JButton button1 = createButton();
        JButton button2 = createButton();
        JButton button3 = createButton();

        buttonPanel.setLayout(new GridLayout(0, 4, 4, 4));
        buttonPanel.add(button0);
        buttonPanel.add(button1);
        buttonPanel.add(button2);
        buttonPanel.add(button3);
        //buttonPanel.setBorder(new LineBorder(Color.black, 1));
        buttonPanel.setOpaque(false);

        label.setLayout(new BorderLayout());
        label.add(labelPanel, BorderLayout.NORTH);
        label.add(buttonPanel, BorderLayout.SOUTH);
        Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
        label.setPreferredSize(new Dimension(d.width / 3, d.height / 3));

        add(label, BorderLayout.CENTER);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setVisible(true);
        startBackground();
        startLabel2();
        new Thread(this).start();
        printWords(); // generating freeze Swing GUI durring EDT
    }

    private JButton createButton() {
        JButton button = new JButton();
        button.setBorderPainted(false);
        button.setBorder(null);
        button.setFocusable(false);
        button.setMargin(new Insets(0, 0, 0, 0));
        button.setContentAreaFilled(false);
        button.setIcon(nextIcon());
        button.setRolloverIcon(nextIcon());
        button.setPressedIcon(nextIcon());
        button.setDisabledIcon(nextIcon());
        nextIcon();
        return button;
    }

    private Icon nextIcon() {
        Icon icon = iconQueue.peek();
        iconQueue.add(iconQueue.remove());
        return icon;
    }

    // Update background at 4/3 Hz
    private void startBackground() {
        backTtimer = new javax.swing.Timer(750, updateBackground());
        backTtimer.start();
        backTtimer.setRepeats(true);
    }

    private Action updateBackground() {
        return new AbstractAction("Background action") {

            private static final long serialVersionUID = 1L;

            @Override
            public void actionPerformed(ActionEvent e) {
                label.setIcon(new ImageIcon(getImage()));
            }
        };
    }

    // Update Label two at 2 Hz
    private void startLabel2() {
        labelTimer = new javax.swing.Timer(500, updateLabel2());
        labelTimer.start();
        labelTimer.setRepeats(true);
    }

    private Action updateLabel2() {
        return new AbstractAction("Label action") {

            private static final long serialVersionUID = 1L;

            @Override
            public void actionPerformed(ActionEvent e) {
                two.setText(petStrings[index]);
                index = (index + 1) % petStrings.length;
            }
        };
    }

    // Update lable one at 3 Hz
    @Override
    public void run() {
        while (runProcess) {
            SwingUtilities.invokeLater(new Runnable() {

                @Override
                public void run() {
                    one.setText(petStrings[index1]);
                    index1 = (index1 + 1) % petStrings.length;
                }
            });
            try {
                Thread.sleep(300);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // Note: blocks EDT
    private void printWords() {
        for (int i = 0; i < petStrings.length; i++) {
            String word = petStrings[i].toString();
            System.out.println(word);
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            three.setText(word);
        }
        three.setText("<html> Concurency Issues in Swing<br>"
                + " never to use Thread.sleep(int) <br>"
                + " durring EDT, simple to freeze GUI </html>");
    }

    public BufferedImage getImage() {
        int w = label.getWidth();
        int h = label.getHeight();
        GradientPaint gp = new GradientPaint(0f, 0f, new Color(
                127 + random.nextInt(128),
                127 + random.nextInt(128),
                127 + random.nextInt(128)),
                w, w,
                new Color(random.nextInt(128), random.nextInt(128), random.nextInt(128)));
        BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = bi.createGraphics();
        g2d.setPaint(gp);
        g2d.fillRect(0, 0, w, h);
        g2d.setColor(Color.BLACK);
        return bi;
    }
}

Answer 2

首先,构建并显示GUI.显示GUI后,使用javax.swing.Timer每500毫秒更新一次GUI:

final Timer timer = new Timer(500, null);
ActionListener listener = new ActionListsner() {
    private Iterator<Word> it = words.iterator();
    @Override 
    public void actionPerformed(ActionEvent e) {
        if (it.hasNext()) {
            label.setText(it.next().getName());
        }
        else {
            timer.stop();
        }
    }
};
timer.addActionListener(listener);
timer.start();