怎样实现字体滚动，用JAVA语言写得？

Question

又来让高手帮忙了，  哈哈！
怎样让字体在窗体上从左到右或从右到左滚动呢？  是不是要计算啊 ？
请指点，最好把代码写出来！谢谢！

Answer 1

package je.test;
//creater:Reindeer 2008-04-22
import javax.swing.*;public class TextMove
{
JLabel lab;
int i;
String str;

public TextMove()
{
JFrame frame = new JFrame("TextMove");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400,200);
str = "I'm moving...";
lab = new JLabel(str);
frame.add(lab);
frame.setVisible(true);
i=0;
while(true)
{
  
str = "        "+str;
try
{
Thread.sleep(1000);
lab.setText(str);
}
catch(InterruptedException e)
{
}
}
}

public static void main(String args[])
{
new TextMove();
}
}

Answer 2

高手！正在学习中，各位大虾都来java专用群6188536

Answer 3

//creater:Reindeer 2008-04-22
import javax.swing.*;public class TextMove
{
    JLabel lab;
    int i;
    String str;
    
    public TextMove()
    {
        JFrame frame = new JFrame("TextMove");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400,200);
        str = "I'm moving . . .";
        String str2 = "";    
        lab = new JLabel(str);
        frame.add(lab);
        frame.setVisible(true);
        i=0;
        while(true)
        {
            str2 +=  "        ";             
                      
            try
            {
                Thread.sleep(1000);
                //String str2 = null;
                for(i=0; i<= str.length(); i++)
                {
                 Thread.sleep(20);
                 lab.setText(str2 + str.substring(0,i));
                }
            }
            catch(InterruptedException e)
            {
            }
        }
    }
    
    public static void main(String args[])
    {
        new TextMove();
    }
}连续显示。呵呵学习啊。

Answer 4

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class WelcomeJFrame extends JFrame
{
private JDialog dialog;
private JLabel label_dialog;
public WelcomeJFrame(String[] texts)
{
super("滚动字");
this.setSize(400,300);
this.setLocation(300,240);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);

if(texts==null||texts.length==0)
        this.add(new RollbyJPanel("Welcome!"));
else
{
this.setLayout(new GridLayout(texts.length,1));
for(int i=0;i<texts.length;i++)
       this.add(new RollbyJPanel(texts[i]));
}
this.setVisible(true);

dialog=new JDialog(this,"提示",true);
dialog.setSize(240,80);
label_dialog=new JLabel("",JLabel.CENTER);
dialog.add(label_dialog);
dialog.setDefaultCloseOperation(HIDE_ON_CLOSE);
}

public WelcomeJFrame()
{
this(null);
}

private class RollbyJPanel extends JPanel implements ActionListener,Runnable
{
private JTextField text_word,text_sleep;
private JButton button_start,button_interrupt;
private JTextField text_state;
private Thread thread_rollby;
private int sleeptime;

private RollbyJPanel(String text)
{
this.setLayout(new GridLayout(2,1));
for(int i=0;i<100;i++)
text=text+"";
text_word=new JTextField(text);
this.add(text_word);

JPanel panel_sub=new JPanel(new FlowLayout(FlowLayout.LEFT));
this.add(panel_sub);

panel_sub.add(new JLabel("sleep"));

this.sleeptime=(int)(Math.random()*100);
text_sleep=new JTextField(""+sleeptime,5);
panel_sub.add(text_sleep);
text_sleep.addActionListener(this);

button_start=new JButton("启动");
panel_sub.add(button_start);
button_start.addActionListener(this);

button_interrupt=new JButton("中断");
panel_sub.add(button_interrupt);
button_interrupt.addActionListener(this);

thread_rollby=new Thread(this);
button_interrupt.setEnabled(false);

panel_sub.add(new JLabel("state"));
text_state=new JTextField(""+thread_rollby.getState(),10);
text_state.setEditable(false);
panel_sub.add(text_state);
}

public void run()
{
while(thread_rollby.isAlive()&&!thread_rollby.isInterrupted())
{
try
{
String str=text_word.getText();
str=str.substring(1)+str.substring(0,1);
text_word.setText(str);
thread_rollby.sleep(sleeptime);
}

catch(InterruptedException e)
{
break;
}

}
}    public void actionPerformed(ActionEvent e)
{
if(e.getSource()==button_start)
{
thread_rollby=new Thread(this);
thread_rollby.start();
text_state.setText(""+thread_rollby.getState());
button_start.setEnabled(false);
button_interrupt.setEnabled(true);
}

if(e.getSource()==button_interrupt)
{
thread_rollby.interrupt();
text_state.setText(""+thread_rollby.getState());
button_start.setEnabled(true);
button_interrupt.setEnabled(false);
}

if(e.getSource()==text_sleep)
{
try
{
sleeptime=Integer.parseInt(text_sleep.getText());
}
catch(NumberFormatException nfe)
{
label_dialog.setText("\""+text_sleep.getText()+"\" 不能转换成整数，请重新输入！");
dialog.setLocation(this.getX()+100,this.getY()+100);
dialog.setVisible(true);
}
}
}
}
public static void main(String arg[])
{
String[] texts={"Welcome","Hello","Rollby"};
new WelcomeJFrame(texts);
}
}

Answer 5

if(texts==null ¦ &brvbartexts.length==0)  这句话报错。