消失的 JTextField 的摆动问题
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【中文标题】消失的 JTextField 的摆动问题【英文标题】：Swing issue with disappearing JTextField 【发布时间】：2012-10-28 19:18:14 【问题描述】：我在 NetBeans 中工作，尝试做我的项目，但遇到了一个问题。基本上，我正在构建一个数字计时器，毫秒显示为 7 个文本字段，以 8 的形状排列。
像这样：
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每毫秒我都会使某些文本字段不可见以显示不同的数字。比我有一个一秒的显示（当毫秒数到 10 时）显示秒，例如1, 2, 3 ...但由于某种原因，当毫秒达到 10 时，中间的文本字段会消失并且不再出现。我不知道是什么导致了这个问题。
这是我的代码：
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
*
*/
public class TimerFrame extends javax.swing.JFrame
/**
* Creates new form TimerFrame
*/
public TimerFrame()
initComponents();
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents()
digitValue = new javax.swing.JTextField();
jTextField1 = new javax.swing.JTextField();
jTextField2 = new javax.swing.JTextField();
jTextField3 = new javax.swing.JTextField();
jTextField4 = new javax.swing.JTextField();
jTextField5 = new javax.swing.JTextField();
jTextField6 = new javax.swing.JTextField();
jTextField7 = new javax.swing.JTextField();
showDigit = new javax.swing.JButton();
AddOne = new javax.swing.JButton();
oneSecs = new javax.swing.JTextField();
showOneSecs = new javax.swing.JButton();
oneSecsDisplay = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Digital Timer");
setBackground(new java.awt.Color(70, 70, 70));
setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
digitValue.setText("000");
jTextField1.setBackground(new java.awt.Color(255, 0, 0));
jTextField1.setText(" ");
jTextField2.setBackground(new java.awt.Color(255, 0, 0));
jTextField2.setText(" ");
jTextField3.setBackground(new java.awt.Color(255, 0, 0));
jTextField3.setText(" ");
jTextField4.setBackground(new java.awt.Color(255, 0, 0));
jTextField4.setText(" ");
jTextField5.setBackground(new java.awt.Color(255, 0, 0));
jTextField5.setText(" ");
jTextField6.setBackground(new java.awt.Color(255, 0, 0));
jTextField6.setText(" ");
jTextField6.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
jTextField6ActionPerformed(evt);
);
jTextField7.setBackground(new java.awt.Color(255, 0, 0));
jTextField7.setText(" ");
showDigit.setText("Show the Digit");
showDigit.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
showDigitActionPerformed(evt);
);
AddOne.setText("Add One");
AddOne.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
AddOneActionPerformed(evt);
);
oneSecs.setText("0");
showOneSecs.setText("Show One Secs");
showOneSecs.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
showOneSecsActionPerformed(evt);
);
org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.add(60, 60, 60)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.add(226, 226, 226)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.add(8, 8, 8)
.add(oneSecsDisplay, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 96, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(62, 62, 62)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING, false)
.add(layout.createSequentialGroup()
.add(jTextField2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 13, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.add(jTextField3, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 13, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.add(layout.createSequentialGroup()
.add(jTextField5, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 13, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(28, 28, 28)
.add(jTextField6, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 13, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)))
.add(layout.createSequentialGroup()
.add(10, 10, 10)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(jTextField7, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 34, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup()
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(org.jdesktop.layout.GroupLayout.TRAILING, jTextField4, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 34, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(org.jdesktop.layout.GroupLayout.TRAILING, jTextField1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.add(10, 10, 10))))))
.add(layout.createSequentialGroup()
.add(showOneSecs)
.add(6, 6, 6)
.add(AddOne)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(showDigit)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(digitValue, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.add(layout.createSequentialGroup()
.add(272, 272, 272)
.add(oneSecs, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(0, 0, Short.MAX_VALUE))))
);
layout.setVerticalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup()
.addContainerGap(104, Short.MAX_VALUE)
.add(oneSecs, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
.add(oneSecsDisplay, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 120, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(layout.createSequentialGroup()
.add(jTextField1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 13, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
.add(jTextField3, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(jTextField2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(jTextField4, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 13, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
.add(jTextField6, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(jTextField5, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.add(7, 7, 7)
.add(jTextField7, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 13, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)))
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(org.jdesktop.layout.GroupLayout.TRAILING, showOneSecs)
.add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
.add(digitValue, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(showDigit)
.add(AddOne)))
.addContainerGap())
);
pack();
// </editor-fold>
private void jTextField6ActionPerformed(java.awt.event.ActionEvent evt)
// TODO add your handling code here:
private void showDigitActionPerformed(java.awt.event.ActionEvent evt)
// showDigit
int digit1 = Integer.parseInt(digitValue.getText());
jTextField1.setVisible(true);
jTextField2.setVisible(true);
jTextField3.setVisible(true);
jTextField4.setVisible(true);
jTextField5.setVisible(true);
jTextField6.setVisible(true);
jTextField7.setVisible(true);
if (digit1 == 0)
jTextField4.setVisible(false);
else if (digit1 == 1)
jTextField1.setVisible(false);
jTextField2.setVisible(false);
jTextField4.setVisible(false);
jTextField5.setVisible(false);
jTextField7.setVisible(false);
else if (digit1 == 2)
jTextField2.setVisible(false);
jTextField6.setVisible(false);
else if (digit1 == 3)
jTextField2.setVisible(false);
jTextField5.setVisible(false);
else if (digit1 == 4)
jTextField1.setVisible(false);
jTextField5.setVisible(false);
jTextField7.setVisible(false);
else if (digit1 == 5)
jTextField3.setVisible(false);
jTextField5.setVisible(false);
else if (digit1 == 6)
jTextField3.setVisible(false);
else if (digit1 == 7)
jTextField2.setVisible(false);
jTextField4.setVisible(false);
jTextField5.setVisible(false);
jTextField7.setVisible(false);
else if (digit1 == 9)
jTextField5.setVisible(false);
private void AddOneActionPerformed(java.awt.event.ActionEvent evt)
// Add One
int addOne = Integer.parseInt(digitValue.getText());
addOne = addOne + 1;
if (addOne == 10)
addOne = 0;
int oneSecond = Integer.parseInt(oneSecs.getText());
oneSecond = oneSecond + 1;
String oneSeconds = Integer.toString(oneSecond);
oneSecs.setText(oneSeconds);
showOneSecsActionPerformed(evt);
String myString = Integer.toString(addOne);
digitValue.setText(myString);
showDigitActionPerformed(evt);
private void showOneSecsActionPerformed(java.awt.event.ActionEvent evt)
// Show One Secs
int ones = Integer.parseInt(oneSecs.getText());
if (ones == 0)
oneSecsDisplay.setIcon(new javax.swing.ImageIcon("0.jpg"));
else if (ones == 1)
oneSecsDisplay.setIcon(new javax.swing.ImageIcon("1.jpg"));
else if (ones == 2)
oneSecsDisplay.setIcon(new javax.swing.ImageIcon("2.jpg"));
else if (ones == 3)
oneSecsDisplay.setIcon(new javax.swing.ImageIcon("3.jpg"));
else if (ones == 4)
oneSecsDisplay.setIcon(new javax.swing.ImageIcon("4.jpg"));
else if (ones == 5)
oneSecsDisplay.setIcon(new javax.swing.ImageIcon("5.jpg"));
else if (ones == 6)
oneSecsDisplay.setIcon(new javax.swing.ImageIcon("6.jpg"));
else if (ones == 7)
oneSecsDisplay.setIcon(new javax.swing.ImageIcon("7.jpg"));
else if (ones == 8)
oneSecsDisplay.setIcon(new javax.swing.ImageIcon("8.jpg"));
else if (ones == 9)
oneSecsDisplay.setIcon(new javax.swing.ImageIcon("9.jpg"));
/**
* @param args the command line arguments
*/
public static void main(String args[])
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels())
if ("Nimbus".equals(info.getName()))
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
catch (ClassNotFoundException ex)
java.util.logging.Logger.getLogger(TimerFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
catch (InstantiationException ex)
java.util.logging.Logger.getLogger(TimerFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
catch (IllegalAccessException ex)
java.util.logging.Logger.getLogger(TimerFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
catch (javax.swing.UnsupportedLookAndFeelException ex)
java.util.logging.Logger.getLogger(TimerFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable()
public void run()
new TimerFrame().setVisible(true);
);
// Variables declaration - do not modify
private javax.swing.JButton AddOne;
private javax.swing.JTextField digitValue;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
private javax.swing.JTextField jTextField3;
private javax.swing.JTextField jTextField4;
private javax.swing.JTextField jTextField5;
private javax.swing.JTextField jTextField6;
private javax.swing.JTextField jTextField7;
private javax.swing.JTextField oneSecs;
private javax.swing.JButton oneSecsDisplay;
private javax.swing.JButton showDigit;
private javax.swing.JButton showOneSecs;
// End of variables declaration
【问题讨论】：
我冒昧地调整了标题和标签，因为这确实是一个 java Swing 问题。 你为什么使用 JTextFields？只需将构成 8 形状的条形绘制到 JPanel 的扩展上。 一秒有超过10毫秒（准确的说是1000）。 NetBeans 生成的代码！ 整洁！我运行了您的代码，但看不到任何问题。你必须更清楚什么是错的。另外，正如其他人所说，在这里使用 JTextFields 很奇怪。你应该看看 Java 2D Graphics。 【参考方案1】：正如 madth3 所指出的，一旦组件变得不可见，大多数布局管理器在计算布局时就不再考虑它。
虽然我可以想到 100 种不同的方法来解决这个问题，但下面的示例使用一个简单的 JPanel 作为一个段，并使用一个时髦的 alpha 颜色技巧来“隐藏”不影响现有布局的段.
public class Clock
public static void main(String[] args)
new Clock();
public Clock()
EventQueue.invokeLater(new Runnable()
@Override
public void run()
try
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
catch (ClassNotFoundException ex)
catch (InstantiationException ex)
catch (IllegalAccessException ex)
catch (UnsupportedLookAndFeelException ex)
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TimerPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
);
public class TimerPane extends JPanel
private List<Segment> segments;
private int tick = 0;
public TimerPane()
setBorder(new EmptyBorder(9, 9, 9, 9));
setLayout(new GridBagLayout());
segments = new ArrayList<>(7);
segments.add(new Segment(false));
segments.add(new Segment(true));
segments.add(new Segment(true));
segments.add(new Segment(false));
segments.add(new Segment(true));
segments.add(new Segment(true));
segments.add(new Segment(false));
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 0;
add(segments.get(0), gbc);
gbc.gridx = 0;
gbc.gridy++;
add(segments.get(1), gbc);
gbc.gridx = 2;
add(segments.get(2), gbc);
gbc.gridx = 1;
gbc.gridy++;
add(segments.get(3), gbc);
gbc.gridy++;
gbc.gridx = 0;
add(segments.get(4), gbc);
gbc.gridx = 2;
add(segments.get(5), gbc);
gbc.gridx = 1;
gbc.gridy++;
add(segments.get(6), gbc);
Timer clock = new Timer(1000, new ActionListener()
@Override
public void actionPerformed(ActionEvent e)
List<Segment> active = new ArrayList<Segment>(segments);
switch (tick)
case 0:
active.remove(segments.get(3));
break;
case 1:
active.remove(segments.get(0));
active.remove(segments.get(1));
active.remove(segments.get(3));
active.remove(segments.get(4));
active.remove(segments.get(6));
break;
case 2:
active.remove(segments.get(1));
active.remove(segments.get(5));
break;
case 3:
active.remove(segments.get(1));
active.remove(segments.get(4));
break;
case 4:
active.remove(segments.get(0));
active.remove(segments.get(4));
active.remove(segments.get(6));
break;
case 5:
active.remove(segments.get(2));
active.remove(segments.get(4));
break;
case 6:
active.remove(segments.get(2));
break;
case 7:
active.remove(segments.get(1));
active.remove(segments.get(3));
active.remove(segments.get(4));
active.remove(segments.get(6));
break;
case 8:
break;
case 9:
active.remove(segments.get(4));
active.remove(segments.get(6));
break;
List<Segment> inactive = new ArrayList<>(segments);
inactive.removeAll(active);
color(active, true);
color(inactive, false);
tick++;
if (tick > 9)
tick = 0;
repaint();
protected void color(List<Segment> segments, boolean isActive)
for (Segment segment : segments)
segment.setActive(isActive);
);
clock.setInitialDelay(0);
clock.setRepeats(true);
clock.start();
public class Segment extends JPanel
protected Color alpha = new Color(0, 0, 0, 0);
private boolean vertical;
private boolean active;
public Segment(boolean vertical)
this.vertical = vertical;
setActive(false);
public void setActive(boolean value)
if (active != value)
active = value;
if (active)
setBackground(Color.LIGHT_GRAY);
setBorder(new LineBorder(Color.DARK_GRAY));
else
setBackground(alpha);
setBorder(new LineBorder(alpha));
public boolean isActive()
return active;
@Override
public Dimension getPreferredSize()
Dimension size = super.getPreferredSize();
if (vertical)
size = new Dimension(5, 15);
else
size = new Dimension(15, 5);
return size;
【讨论】：
您好，谢谢您的回答，但我需要按照我提到的那样做，因为它是 uni 项目所必需的，我本可以采用这种不同且更有效的方式，但必须遵守规则；/ 因此，不要使用面板，而是用文本字段替换它们【参考方案2】：对于初学者，我不得不说这是一个非常不寻常的数字显示实现。更改元素的可见性可能会导致组件重新布局并发生此类问题。
这个问题是由在按钮oneSecsDisplay 上更改图标的调用引起的，因为可以看到对showOneSecsActionPerformed 的调用注释掉了。布局重新打包了所有内容，中间的 JTextField 消失了。
我不是 GroupLayout 方面的专家，但一个可能的简短解决方案是将所有这些 TextFields 放入它自己的面板中。从长远来看，我同意@whiskeyspider 推荐a drawing alternative。
【讨论】：
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