Swing，如何在JLabel上实现滚动字符？？？

[nicholasmars]

在Swing中用一个JLabel保存一个String，让这个String滚动起来，不会做。。。。。。
希望大家帮帮忙，最好要有代码。。。。

[awusoft]

流动的原理就是,"JAVA"下一次变成"AVAJ" 再一下次就是变成"VAJA",再下来就是"AJAV"
用一个线程去做,让这个lable的action = action.substring(1,action.length)+action.substring(0,1);
延迟一定时间.

[awusoft]

[code=JAVA]
import java.awt.Color;
import java.awt.GridBagLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;

public class SwingTest extends JFrame{
private JLabel lable = new JLabel("滚动的文字");
public SwingTest()
{
this.setBackground(Color.BLACK);
this.getContentPane().setBackground(Color.blue);
this.setSize(200,300);
this.setVisible(true);
lable.setBackground(Color.red);
lable.setSize(200, 50);
this.getContentPane().add(lable);
new ChangeCaption(lable).start();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public JLabel getLable()
{
return lable;
}
public static void main(String[]args)
{
new SwingTest();
}

}
class ChangeCaption extends Thread
{
private JLabel lable;
public ChangeCaption(JLabel lable)
{
this.lable = lable;
}
public void run() {
// TODO Auto-generated method stub
//super.run();
while(true)
{
String text = lable.getText();
lable.setText(text.substring(1,text.length())+text.substring(0,1));
try {
Thread.sleep(400);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}


[/code]

[nicholasmars]

谢谢

[insiku]

[Quote=引用 2 楼 AWUSOFT 的回复:]
[code=JAVA]
import java.awt.Color;
import java.awt.GridBagLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;

public class SwingTest extends JFrame{
private JLabel lable = new JLabel("滚动的文字");
public SwingTest()
{
this.setBackground(Color.BLACK);
this.getContentPane().setBackground(Color.blue);
this.setSize(200,300);
this.setVisible(true);
lable.setBa…
[/Quote]

你的代码虽然可以用
但是 是不安全的
刷新界面的线程必须放在EDT线程中去做

[lping1986]

学习

[awusoft]

呵呵，我不知道什么是EDT纯程哦。有时间去看看

[Inhibitory]

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

public class Test extends JPanel {
    private static final long serialVersionUID = 4767050156491994899L;
    private JLabel            label;
    private String            scrolledText;

    public Test() {
        scrolledText = "滚动文字 Demo";
        label = new JLabel(new String(scrolledText));
        this.add(label);

        Thread thread = new Thread(new TextChanger(label));
        thread.start();
    }

    // @Override
    // protected void paintComponent(Graphics g) {
    // super.paintComponent(g);
    //
    // Graphics2D g2d = (Graphics2D) g;
    //
    // }

    private static void createAndShowGUI() {
        JFrame frame = new JFrame("Frame");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 400);

        frame.getContentPane().add(new Test());

        frame.setVisible(true);
    }

    public static void main(String[] args) throws Exception {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                Test.createAndShowGUI();
            }
        });
    }
}

class TextChanger implements Runnable {
    private JLabel label;

    public TextChanger(JLabel label) {
        this.label = label;
    }

    public void run() {
        try {
            while (true) {
                String text = label.getText();
                if (text.length() > 1) {
                    text = text.substring(1, text.length()) + text.charAt(0);
                    label.setText(text);

                    // Get the frame
                    Component frame = SwingUtilities.getRoot(label);
                    if (frame != null && (frame instanceof JFrame)) {
                        ((JFrame)frame).setTitle(text);
                    }

                    label.repaint();
                }

                Thread.sleep(300);
            }
        } catch (InterruptedException ex) {
            ex.printStackTrace();
        }
    }
}

[nicholasmars]

好人多啊~~~