JTextArea附加

我在一些代码上写了一些代码来对不同类型的啤酒进行计算。我有一个使用GUI的主类，并有一个JTextArea来打印输出。在主类中调用附加功能工作得很好，但只要我尝试从外部类调用append来写入文本区域..没有雪茄......我在此工作了一段时间，根本没有任何线索。相当多的代码，但我认为修复很简单，我想在IM的时候，将NewFileOpener扩展到LagerChooser是否有意义？还是应该扩展jpanel？JTextArea附加

感谢您的帮助！

public class NewFinalOpener extends JPanel implements ActionListener { 

JFileChooser fc; 
private CustomPanel customPanel; 
public CustomTextArea customTextArea = new CustomTextArea(); 
private double versionID = 1.0; 
private JButton openButton; 
protected ArrayList<String> namesForGeneration; 
private boolean namesRead = false; 

void displayGUI() { 

    JFrame frame = new JFrame("Binary Brewing! " + "Version:" + versionID); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

    JPanel contentPane = new JPanel(); 
    contentPane.setLayout(new BorderLayout(5, 5)); 
    contentPane.setBorder(BorderFactory.createLineBorder(Color.BLUE, 5)); 
    customPanel = new CustomPanel(); 
//  customTextArea = new CustomTextArea(); 
    customTextArea 
      .append("              Program progress and/or errors will display below:"); 
    customTextArea 
      .append("\n" 
        + "----------------------------------------------------------------------------------------------------"); 
    customTextArea.append("\n" + "\n" 
      + "To Enable Beer recipe Generation please read in Name file!" + "\n"); 
    contentPane.add(customTextArea, BorderLayout.CENTER); 
    contentPane.add(customPanel, BorderLayout.LINE_START); 

    frame.setContentPane(contentPane); 
    frame.pack(); 
    frame.setLocationByPlatform(true); 
    frame.setVisible(true); 



} 




public static void main(String[] args) { 

    Runnable runnable = new Runnable() { 
     @Override 
     public void run() { 
      new NewFinalOpener().displayGUI(); 
     } 
    }; 
    EventQueue.invokeLater(runnable); 
} 

class CustomPanel extends JPanel implements ActionListener { 
    private static final int GAP = 5; 
    JButton openButton, b2, b3, b4; 

    public CustomPanel() { 
     fc = new JFileChooser(); 
     setOpaque(true); 
     setBackground(Color.WHITE); 
     setBorder(BorderFactory.createLineBorder(Color.GRAY, GAP)); 
     openButton = new JButton("Choose names file"); 
     openButton.setVerticalTextPosition(AbstractButton.CENTER); 
     openButton.setHorizontalTextPosition(AbstractButton.LEADING); 

     openButton.setMnemonic(KeyEvent.VK_D); 
     openButton.setActionCommand("open"); 
     openButton.setEnabled(true); 
     openButton.addActionListener(this); 
     add(openButton); 

     b2 = new JButton("Ale"); 
     b2.setVerticalTextPosition(AbstractButton.CENTER); 
     b2.setHorizontalTextPosition(AbstractButton.LEADING); 

     b2.setMnemonic(KeyEvent.VK_D); 
     b2.setActionCommand("ale"); 

     if(namesRead == false){ 
      b2.setEnabled(false); 
     } 

     b2.addActionListener(this); 
     add(b2); 

     b3 = new JButton("Lager"); 
     b3.setVerticalTextPosition(AbstractButton.CENTER); 
     b3.setHorizontalTextPosition(AbstractButton.LEADING); 

     b3.setMnemonic(KeyEvent.VK_D); 
     b3.setActionCommand("lager"); 

     if(namesRead == false){ 
      b3.setEnabled(false); 
     } 

     b3.addActionListener(this); 
     add(b3); 

     b4 = new JButton("Random"); 
     b4.setVerticalTextPosition(AbstractButton.BOTTOM); 
     b4.setHorizontalTextPosition(AbstractButton.LEADING); 

     b4.setMnemonic(KeyEvent.VK_D); 
     b4.setActionCommand("lager"); 

     if(namesRead == false){ 
      b4.setEnabled(false); 
     } 

     b4.addActionListener(this); 
     add(b4); 



    } 




    public Dimension getPreferredSize() { 
     return (new Dimension(200, 100)); 
    } 

    @Override 
    public void actionPerformed(ActionEvent e) { 
     String action = e.getActionCommand(); 
     if (action.equals("open")) { 
      int returnVal = fc.showOpenDialog(NewFinalOpener.this); 
      if (returnVal == JFileChooser.APPROVE_OPTION) { 

       File file = fc.getSelectedFile(); 
       try { 

        BufferedReader br = new BufferedReader(new FileReader(
          fc.getSelectedFile())); 
        String line = " "; 

        namesForGeneration = new ArrayList<String>(); 
        while (br.ready() == true) { 
         line = br.readLine(); 
         namesForGeneration.add(line); 

        } 

        if (br.ready() == false) { 
         customTextArea.append("\n" 
           + "Successfully read all names!" + " " 
           + file + "\n"); 
         customTextArea.append("\n" + "Beer Recipe Generator Enabled!" + "\n"); 
         namesRead = true; 
         b2.setEnabled(true); 
         b3.setEnabled(true); 
         b4.setEnabled(true); 
         openButton.setEnabled(false); 
         customTextArea 
           .append("\n" 
             + "---------------------------------------------------------"); 

         br.close(); 
        } 

       } catch (Exception f) { 
        JOptionPane.showMessageDialog(null, e); 
       } 

      } else { 
       customTextArea.append("Open command cancelled by user." 
         + "\n"); 
      } 
     } 

     if(action.equalsIgnoreCase("lager")){ 
      customTextArea.append("\n" + "\n "+ "Ale recipe generation selected proceeding to sub categories..."); 
      b2.setEnabled(false); 
      b3.setEnabled(false); 
      b4.setEnabled(false); 
      createLagerFrame(); 

     } 

    } 




    protected void createLagerFrame(){ 
     LagerChooser l1 = new LagerChooser(); 

    } 



} 

class CustomTextArea extends JTextArea { 

    private static final int GAP = 5; 

    public CustomTextArea() { 

     setEditable(false); 
     setBorder(BorderFactory.createLineBorder(Color.CYAN, GAP)); 
    } 

    public Dimension getPreferredSize() { 
     return (new Dimension(800, 800)); 
    } 
} 





@Override 
public void actionPerformed(ActionEvent arg0) { 
    // TODO Auto-generated method stub 

} 

public void setCustomText(String text){ 
    customTextArea.append(text); 
} 


    }

和需要追加到JTextArea中

import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 

import javax.swing.BorderFactory; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.JTextArea; 
import javax.swing.SwingUtilities; 

public class LagerChooser extends NewFinalOpener{ 


public LagerChooser() { 



} 
public void tellCustom(String line){ 
    setCustomText(line); 
} 
}

来源

2015-07-19 Ben Goodwin

*“但只要我尝试调用从外部类追加到写入文本area..no雪茄。” *让自己的E-CIG然后。他们不仅品尝更好，而且更健康。但更严重的是，总是复制/粘贴错误和异常输出！ –

创建调用append方法的主类的公共方法的类。然后从另一个类调用该方法。

来源

2015-07-19 09:32:09 ImBatman64

您可以使用：

public static final PrintStream OUT = System.out; 
public CustomPanel() throws Throwable 
{ 
    ... 
    System.setOut(new PrintStream(new OutputStream(){ 

          @Override 
          public void write(int oneByte) throws IOException { 
           if(oneByte<0||oneByte>255) 
            return; 
           write(new byte[]{(byte)oneByte}, 0, 1); 
          } 
          @Override 
          public void write(byte[] b, int offset, int length) throws IOException { 
           String str = new String(b, offset, length); 
           customTextArea.append(str); 
          } 
         }));

，并写入System.out中。它将打印到控制台和textarea。

PS。为什么你要创建自定义的textarea类？您应该使用的JTextArea：

customTextArea=new JTextArea(); 
customTextArea.setEditable(false); 
customTextArea.setBorder(BorderFactory.createLineBorder(Color.CYAN, GAP)); 
customTextArea.setPrefferedSize(...);

你的代码使用大量的内存，出口JAR的尺寸不小的“简单计划”。优化代码：

import java.io.*; 
import java.util.*; 
class NewFinalOpener extends JPanel implements ActionListener { 
JFileChooser fc; 
private CustomPanel customPanel; 
public JTextArea customTextArea = new JTextArea(); 
private double versionID = 1.0; 
private JButton openButton; 
protected ArrayList <String> namesForGeneration; 
private boolean namesRead = false; 
private static final PrintStream SYSOUT = System.out; 
public NewFinalOpener() { 
    JFrame frame = new JFrame("Binary Brewing! Version:" + versionID); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    JPanel contentPane = new JPanel(); 
    contentPane.setLayout(new BorderLayout(5, 5)); 
    contentPane.setBorder(BorderFactory.createLineBorder(Color.BLUE, 5)); 
    customPanel = new CustomPanel(); 
    customTextArea.setEditable(false); 
    customTextArea.setBorder(BorderFactory.createLineBorder(Color.CYAN, GAP)); 
    customTextArea.setPreferredSize(new Dimension(800, 800)); 
    System.setOut(new PrintStream(new OutputStream(){ 

          @Override 
          public void write(int oneByte) throws IOException { 
           if(oneByte<0||oneByte>255) 
            return; 
           write(new byte[]{(byte)oneByte}, 0, 1); 
          } 
          @Override 
          public void write(byte[] b, int offset, int length) throws IOException { 
           String str = new String(b, offset, length); 
           SYSOUT.write(b,offset,length); 
           customTextArea.append(str); 
          } 
         })); 
    System.setErr(System.out); 
    System.out.println(" Program progress and/or errors will display below:"); 
    System.out.println("----------------------------------------------------------------------------------------------------\n"); 
    System.out.println("To Enable Beer recipe Generation please read in Name file!"); 
    contentPane.add(customTextArea, BorderLayout.CENTER); 
    contentPane.add(customPanel, BorderLayout.LINE_START); 
    frame.setContentPane(contentPane); 
    frame.pack(); 
    frame.setLocationByPlatform(true); 
    frame.setVisible(true); 
} 
public static void main(String[] args) { 
    EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       new NewFinalOpener(); 
      } 
     }); 
} 
class CustomPanel extends JPanel implements ActionListener { 
    private static final int GAP = 5; 
    JButton openButton, b2, b3, b4; 
    public CustomPanel() { 
     setPreferredSize(new Dimension(200, 100)); 
     fc = new JFileChooser(); 
     setOpaque(true); 
     setBackground(Color.WHITE); 
     setBorder(BorderFactory.createLineBorder(Color.GRAY, GAP)); 
     openButton = new JButton("Choose names file"); 
     openButton.setVerticalTextPosition(AbstractButton.CENTER); 
     openButton.setHorizontalTextPosition(AbstractButton.LEADING); 
     openButton.setMnemonic(KeyEvent.VK_D); 
     openButton.setActionCommand("open"); 
     openButton.setEnabled(true); 
     openButton.addActionListener(this); 
     add(openButton); 
     b2 = new JButton("Ale"); 
     b2.setVerticalTextPosition(AbstractButton.CENTER); 
     b2.setHorizontalTextPosition(AbstractButton.LEADING); 
     b2.setMnemonic(KeyEvent.VK_D); 
     b2.setActionCommand("ale"); 
     if (namesRead == false) { 
      b2.setEnabled(false); 
     } 
     b2.addActionListener(this); 
     add(b2); 
     b3 = new JButton("Lager"); 
     b3.setVerticalTextPosition(AbstractButton.CENTER); 
     b3.setHorizontalTextPosition(AbstractButton.LEADING); 
     b3.setMnemonic(KeyEvent.VK_D); 
     b3.setActionCommand("lager"); 
     if (namesRead == false) { 
      b3.setEnabled(false); 
     } 
     b3.addActionListener(this); 
     add(b3); 
     b4 = new JButton("Random"); 
     b4.setVerticalTextPosition(AbstractButton.BOTTOM); 
     b4.setHorizontalTextPosition(AbstractButton.LEADING); 
     b4.setMnemonic(KeyEvent.VK_D); 
     b4.setActionCommand("lager"); 
     if (namesRead == false) { 
      b4.setEnabled(false); 
     } 
     b4.addActionListener(this); 
     add(b4); 
    } 
    @Override 
    public void actionPerformed(ActionEvent e) { 
     String action = e.getActionCommand(); 
     if (action.equals("open")) { 
      int returnVal = fc.showOpenDialog(NewFinalOpener.this); 
      if (returnVal == JFileChooser.APPROVE_OPTION) { 
       File file = fc.getSelectedFile(); 
       try { 
        BufferedReader br = new BufferedReader(new FileReader(fc.getSelectedFile())); 
        String line = " "; 
        namesForGeneration = new ArrayList <String>(); 
        while (br.ready() == true) { 
         line = br.readLine(); 
         namesForGeneration.add(line); 
        } 
        if (br.ready() == false) { 
         System.out.println("Successfully read all names!" + " " + file + "\n"); 
         System.out.println("Beer Recipe Generator Enabled!" + "\n"); 
         namesRead = true; 
         b2.setEnabled(true); 
         b3.setEnabled(true); 
         b4.setEnabled(true); 
         openButton.setEnabled(false); 
         System.out.println("\n---------------------------------------------------------"); 
         br.close(); 
        } 
       } catch (Throwable f) { 
        f.printStackTrace(); 
        JOptionPane.showMessageDialog(null, e); 
       } 
      } else { 
       System.out.println("Open command cancelled by user."); 
      } 
     } 
     if (action.equalsIgnoreCase("lager")) { 
      System.out.println("Ale recipe generation selected proceeding to sub categories..."); 
      b2.setEnabled(false); 
      b3.setEnabled(false); 
      b4.setEnabled(false); 
      createLagerFrame(); 
     } 
    } 
    protected void createLagerFrame() { 
     LagerChooser l1 = new LagerChooser(); 
    } 
} 
} 
class LagerChooser extends NewFinalOpener { 
public LagerChooser() {} 
public void tellCustom(String line) { 
    setCustomText(line); 
} 
}

来源

2015-07-19 09:37:41 barwnikk

太棒了！非常感谢优化的代码，我可以看到好处。我还有一些我不确定的事情。我在eclipse中编写这个项目，对我来说，如果我创建一个新的类“lager chooser”，而不是在NewFinalOpener类的底部，这个工作是否会更简单？使用您提供的代码（我非常感谢）似乎创建了主窗口的新实例。我希望的输出是在点击其中一个主要按钮（al或lager）之后出现一个小窗口（不用处理主窗口）以选择一个子类别，同时向主jTextarea打印进度 –

*“这个工作是否可行？”*您应该就此提出一个单独的问题。 SO是一个Q＆A网站，不是'一站式，修复我的代码'服务。请[接受答案]（http://meta.stackexchange.com/a/5235/155831）如果它帮助解决这个线程的问题。 –

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