滚动字问题

Question

package org.welcomejframe;import javax.swing.JFrame;
import java.awt.*;
import java.awt.event.*;import javax.swing.*;public class WelcomeJFrame extends JFrame {
    public WelcomeJFrame(String texts[])
    {
     super("滚动字");
     this.setBounds(300, 240, 400, 300);
     this.setDefaultCloseOperation(EXIT_ON_CLOSE);
     if(texts==null || texts.length==0)
     this.getContentPane().add(new RollbyJPanel("Welcome!"));
     else
     {
     this.getContentPane().setLayout(new GridLayout(texts.length,1));
     for(int i=0;i<texts.length;i++)
     {
     this.getContentPane().add(new RollbyJPanel(texts[i]));
     }
     }
     this.setVisible(true);
    }
    public WelcomeJFrame()
    {
     this(null);
    }
    private class RollbyJPanel extends JPanel implements ActionListener,Runnable
    {
     JTextField text_word,text_sleep;
     JButton button_start,button_interrupt;
     JTextField text_state;
     Thread thread_rollby;
     int sleeptime;
    
     RollbyJPanel(String text)
     {
     this.setLayout(new GridLayout(2,1));
     char space[] = new char[100];
     java.util.Arrays.fill(space,' ');
     text_word = new JTextField(text+new String(space));
     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(true)
     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)
     {
     JOptionPane.showMessageDialog(this, "\""+text_sleep.getText()+"\" 不能转换成整数，请重新输入！！");
     }
     }
     }
    }
public static void main(String[] args) {
String []texts = {"Welcome","Hello","Rollby","wo ca "};
new WelcomeJFrame(texts); }}
好像这里有个自动设置等待时间的语句没执行，请问代码哪里需要修改

Answer 1

if(e.getSource()==text_sleep)
  {
  try
  {
  sleeptime = Integer.parseInt(text_sleep.getText());
  }
  catch(NumberFormatException nfe)
  {
  JOptionPane.showMessageDialog(this, "\""+text_sleep.getText()+"\" 不能转换成整数，请重新输入！！");
  }
感觉这句好像没执行一样

Answer 2

首先提醒你解决问题记得结贴给分哦改成下面这样就可以了，你上面写的这段代码任何时候都不会执行，因为e.getSource()在你这里只能是按钮，所以应该在启动按钮之后执行import javax.swing.JFrame;
import java.awt.*;
import java.awt.event.*;import javax.swing.*;public class WelcomeJFrame extends JFrame {
    public WelcomeJFrame(String texts[])
    {
        super("滚动字");
        this.setBounds(300, 240, 400, 300);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        if(texts==null || texts.length==0)
            this.getContentPane().add(new RollbyJPanel("Welcome!"));
        else
        {
            this.getContentPane().setLayout(new GridLayout(texts.length,1));
            for(int i=0;i<texts.length;i++)
            {
                this.getContentPane().add(new RollbyJPanel(texts[i]));
            }
        }
        this.setVisible(true);
    }
    public WelcomeJFrame()
    {
        this(null);
    }
    private class RollbyJPanel extends JPanel implements ActionListener,Runnable
    {
        JTextField text_word,text_sleep;
        JButton button_start,button_interrupt;
        JTextField text_state;
        Thread thread_rollby;
        int sleeptime;        RollbyJPanel(String text)
        {
            this.setLayout(new GridLayout(2,1));
            char space[] = new char[100];
            java.util.Arrays.fill(space,' ');
            text_word = new JTextField(text+new String(space));
            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(true)
                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){
                //added by ioe_gaoyong
                try{
                    this.sleeptime = Integer.parseInt(text_sleep.getText());
                }catch(NumberFormatException nfe){
                    JOptionPane.showMessageDialog(this, "\""+text_sleep.getText()+"\" 不能转换成整数，请重新输入！！");
                }  //added ended
                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)
//            {
//
//            }
        }
    }
    public static void main(String[] args) {
        String []texts = {"Welcome","Hello","Rollby","wo ca "};
        new WelcomeJFrame(texts);    }}

Answer 3

文本框不会触发ActionEvent这个是因为你没有设置文本框的相应坚挺，ActionListner监听不到文本框相关的，能监听到的就是按钮提交、多选框的选择这样的事件