标签到（Netbeans）后如何使jtextfield文本消失
[英]how to make jtextfield text disappear when tabbed into (Netbeans)
问题描述
I'm working on a gui that has multiple textfields that the user enters data into. 
我正在使用一个具有多个文本字段的gui，用户可以在其中输入数据。 When the program opens, I have the instructions for what the user is supposed to enter into the textfield set as the "text". 程序打开时，我将获得有关用户应该输入到设置为“文本”的文本字段中的说明。 I have it set to when user clicks textfield, the text will disappear, but I can't figure out how to get it to disappear when tabbed over into the next jtextfield. 我将其设置为当用户单击文本字段时，文本将消失，但是我无法弄清楚如何在切换到下一个jtextfield时使其消失。 I want the user to be able to click on the first textfield, and never have to use the mouse again, but also without having to go crazy on the backspace or del. 我希望用户能够单击第一个文本字段，而不必再次使用鼠标，而且也不必在退格键或del上发疯。 Thanks 谢谢
/*
* ArcheryProgramView.java
*/
package archeryprogram;
import org.jdesktop.application.Action;
import org.jdesktop.application.ResourceMap;
import org.jdesktop.application.SingleFrameApplication;
import org.jdesktop.application.FrameView;
import org.jdesktop.application.TaskMonitor;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyEvent;
import javax.swing.Timer;
import javax.swing.Icon;
import javax.swing.JDialog;
import javax.swing.JFrame;
/**
* The application's main frame.
*/
public class ArcheryProgramView extends FrameView {
public ArcheryProgramView(SingleFrameApplication app) {
super(app);
initComponents();
// status bar initialization - message timeout, idle icon and busy animation, etc
ResourceMap resourceMap = getResourceMap();
int messageTimeout = resourceMap.getInteger("StatusBar.messageTimeout");
messageTimer = new Timer(messageTimeout, new ActionListener() {
public void actionPerformed(ActionEvent e) {
statusMessageLabel.setText("");
}
});
messageTimer.setRepeats(false);
int busyAnimationRate = resourceMap.getInteger("StatusBar.busyAnimationRate");
for (int i = 0; i < busyIcons.length; i++) {
busyIcons[i] = resourceMap.getIcon("StatusBar.busyIcons[" + i + "]");
}
busyIconTimer = new Timer(busyAnimationRate, new ActionListener() {
public void actionPerformed(ActionEvent e) {
busyIconIndex = (busyIconIndex + 1) % busyIcons.length;
statusAnimationLabel.setIcon(busyIcons[busyIconIndex]);
}
});
idleIcon = resourceMap.getIcon("StatusBar.idleIcon");
statusAnimationLabel.setIcon(idleIcon);
progressBar.setVisible(false);
// connecting action tasks to status bar via TaskMonitor
TaskMonitor taskMonitor = new TaskMonitor(getApplication().getContext());
taskMonitor.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
public void propertyChange(java.beans.PropertyChangeEvent evt) {
String propertyName = evt.getPropertyName();
if ("started".equals(propertyName)) {
if (!busyIconTimer.isRunning()) {
statusAnimationLabel.setIcon(busyIcons[0]);
busyIconIndex = 0;
busyIconTimer.start();
}
progressBar.setVisible(true);
progressBar.setIndeterminate(true);
} else if ("done".equals(propertyName)) {
busyIconTimer.stop();
statusAnimationLabel.setIcon(idleIcon);
progressBar.setVisible(false);
progressBar.setValue(0);
} else if ("message".equals(propertyName)) {
String text = (String)(evt.getNewValue());
statusMessageLabel.setText((text == null) ? "" : text);
messageTimer.restart();
} else if ("progress".equals(propertyName)) {
int value = (Integer)(evt.getNewValue());
progressBar.setVisible(true);
progressBar.setIndeterminate(false);
progressBar.setValue(value);
}
}
});
}
@Action
public void showAboutBox() {
if (aboutBox == null) {
JFrame mainFrame = ArcheryProgramApp.getApplication().getMainFrame();
aboutBox = new ArcheryProgramAboutBox(mainFrame);
aboutBox.setLocationRelativeTo(mainFrame);
}
ArcheryProgramApp.getApplication().show(aboutBox);
}
/** 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() {
mainPanel = new javax.swing.JPanel();
jScrollPane1 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
jTextField1 = new javax.swing.JTextField();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jTextField2 = new javax.swing.JTextField();
jTextField3 = new javax.swing.JTextField();
jButton1 = new javax.swing.JButton();
jLabel4 = new javax.swing.JLabel();
jTextField4 = new javax.swing.JTextField();
jButton2 = new javax.swing.JButton();
jLabel5 = new javax.swing.JLabel();
jTextField5 = new javax.swing.JTextField();
jTextField6 = new javax.swing.JTextField();
jTextField7 = new javax.swing.JTextField();
jTextField8 = new javax.swing.JTextField();
menuBar = new javax.swing.JMenuBar();
javax.swing.JMenu fileMenu = new javax.swing.JMenu();
javax.swing.JMenuItem exitMenuItem = new javax.swing.JMenuItem();
javax.swing.JMenu helpMenu = new javax.swing.JMenu();
javax.swing.JMenuItem aboutMenuItem = new javax.swing.JMenuItem();
statusPanel = new javax.swing.JPanel();
javax.swing.JSeparator statusPanelSeparator = new javax.swing.JSeparator();
statusMessageLabel = new javax.swing.JLabel();
statusAnimationLabel = new javax.swing.JLabel();
progressBar = new javax.swing.JProgressBar();
org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance(archeryprogram.ArcheryProgramApp.class).getContext().getResourceMap(ArcheryProgramView.class);
mainPanel.setBackground(resourceMap.getColor("mainPanel.background")); // NOI18N
mainPanel.setName("mainPanel"); // NOI18N
jScrollPane1.setName("jScrollPane1"); // NOI18N
jTextArea1.setBackground(resourceMap.getColor("jTextArea1.background")); // NOI18N
jTextArea1.setColumns(20);
jTextArea1.setFont(resourceMap.getFont("jTextArea1.font")); // NOI18N
jTextArea1.setForeground(resourceMap.getColor("jTextArea1.foreground")); // NOI18N
jTextArea1.setRows(5);
jTextArea1.setText(resourceMap.getString("jTextArea1.text")); // NOI18N
jTextArea1.setName("jTextArea1"); // NOI18N
jScrollPane1.setViewportView(jTextArea1);
jTextField1.setText(resourceMap.getString("jTextField1.text")); // NOI18N
jTextField1.setName("jTextField1"); // NOI18N
jTextField1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jTextField1MouseClicked(evt);
}
});
jLabel1.setText(resourceMap.getString("jLabel1.text")); // NOI18N
jLabel1.setName("jLabel1"); // NOI18N
jLabel2.setText(resourceMap.getString("jLabel2.text")); // NOI18N
jLabel2.setName("jLabel2"); // NOI18N
jLabel3.setText(resourceMap.getString("jLabel3.text")); // NOI18N
jLabel3.setName("jLabel3"); // NOI18N
jTextField2.setText(resourceMap.getString("jTextField2.text")); // NOI18N
javax.swing.ActionMap actionMap = org.jdesktop.application.Application.getInstance(archeryprogram.ArcheryProgramApp.class).getContext().getActionMap(ArcheryProgramView.class, this);
jTextField2.setAction(actionMap.get("clear")); // NOI18N
jTextField2.setName("jTextField2"); // NOI18N
jTextField2.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jTextField2MouseClicked(evt);
}
});
jTextField3.setText(resourceMap.getString("jTextField3.text")); // NOI18N
jTextField3.setName("jTextField3"); // NOI18N
jTextField3.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jTextField3MouseClicked(evt);
}
});
jTextField3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField3ActionPerformed(evt);
}
});
jTextField3.addInputMethodListener(new java.awt.event.InputMethodListener() {
public void caretPositionChanged(java.awt.event.InputMethodEvent evt) {
jTextField3CaretPositionChanged(evt);
}
public void inputMethodTextChanged(java.awt.event.InputMethodEvent evt) {
}
});
jTextField3.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent evt) {
jTextField3KeyReleased(evt);
}
});
jButton1.setAction(actionMap.get("weight")); // NOI18N
jButton1.setText(resourceMap.getString("jButton1.text")); // NOI18N
jButton1.setName("jButton1"); // NOI18N
jLabel4.setText(resourceMap.getString("jLabel4.text")); // NOI18N
jLabel4.setName("jLabel4"); // NOI18N
jTextField4.setText(resourceMap.getString("jTextField4.text")); // NOI18N
jTextField4.setName("jTextField4"); // NOI18N
jTextField4.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jTextField4MouseClicked(evt);
}
});
jButton2.setText(resourceMap.getString("jButton2.text")); // NOI18N
jButton2.setName("jButton2"); // NOI18N
jLabel5.setText(resourceMap.getString("jLabel5.text")); // NOI18N
jLabel5.setName("jLabel5"); // NOI18N
jTextField5.setText(resourceMap.getString("jTextField5.text")); // NOI18N
jTextField5.setName("jTextField5"); // NOI18N
jTextField5.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jTextField5MouseClicked(evt);
}
});
jTextField6.setText(resourceMap.getString("jTextField6.text")); // NOI18N
jTextField6.setName("jTextField6"); // NOI18N
jTextField6.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jTextField6MouseClicked(evt);
}
});
jTextField7.setText(resourceMap.getString("jTextField7.text")); // NOI18N
jTextField7.setName("jTextField7"); // NOI18N
jTextField7.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jTextField7MouseClicked(evt);
}
});
jTextField8.setText(resourceMap.getString("jTextField8.text")); // NOI18N
jTextField8.setName("jTextField8"); // NOI18N
javax.swing.GroupLayout mainPanelLayout = new javax.swing.GroupLayout(mainPanel);
mainPanel.setLayout(mainPanelLayout);
mainPanelLayout.setHorizontalGroup(
mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(mainPanelLayout.createSequentialGroup()
.addGap(19, 19, 19)
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(mainPanelLayout.createSequentialGroup()
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 79, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(193, 193, 193))
.addGroup(mainPanelLayout.createSequentialGroup()
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 218, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(mainPanelLayout.createSequentialGroup()
.addComponent(jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, 163, Short.MAX_VALUE)
.addGap(83, 83, 83))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, mainPanelLayout.createSequentialGroup()
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 89, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 92, Short.MAX_VALUE)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(mainPanelLayout.createSequentialGroup()
.addGap(144, 144, 144)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(26, 26, 26)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(mainPanelLayout.createSequentialGroup()
.addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, 79, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jTextField7, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jTextField8, javax.swing.GroupLayout.PREFERRED_SIZE, 76, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(30, 30, 30)
.addComponent(jButton1))
.addComponent(jButton2))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 67, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel5))
.addGap(191, 191, 191))
);
mainPanelLayout.setVerticalGroup(
mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(mainPanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 63, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(70, 70, 70)
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel3)
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField7, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel4)
.addComponent(jButton1)
.addComponent(jTextField8, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(18, 18, 18)
.addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel5)
.addComponent(jButton2))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jLabel2)
.addContainerGap(258, Short.MAX_VALUE))
);
menuBar.setName("menuBar"); // NOI18N
fileMenu.setText(resourceMap.getString("fileMenu.text")); // NOI18N
fileMenu.setName("fileMenu"); // NOI18N
exitMenuItem.setAction(actionMap.get("quit")); // NOI18N
exitMenuItem.setName("exitMenuItem"); // NOI18N
fileMenu.add(exitMenuItem);
menuBar.add(fileMenu);
helpMenu.setText(resourceMap.getString("helpMenu.text")); // NOI18N
helpMenu.setName("helpMenu"); // NOI18N
aboutMenuItem.setAction(actionMap.get("showAboutBox")); // NOI18N
aboutMenuItem.setName("aboutMenuItem"); // NOI18N
helpMenu.add(aboutMenuItem);
menuBar.add(helpMenu);
statusPanel.setName("statusPanel"); // NOI18N
statusPanelSeparator.setName("statusPanelSeparator"); // NOI18N
statusMessageLabel.setName("statusMessageLabel"); // NOI18N
statusAnimationLabel.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
statusAnimationLabel.setName("statusAnimationLabel"); // NOI18N
progressBar.setName("progressBar"); // NOI18N
javax.swing.GroupLayout statusPanelLayout = new javax.swing.GroupLayout(statusPanel);
statusPanel.setLayout(statusPanelLayout);
statusPanelLayout.setHorizontalGroup(
statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(statusPanelSeparator, javax.swing.GroupLayout.DEFAULT_SIZE, 1162, Short.MAX_VALUE)
.addGroup(statusPanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(statusMessageLabel)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 992, Short.MAX_VALUE)
.addComponent(progressBar, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(statusAnimationLabel)
.addContainerGap())
);
statusPanelLayout.setVerticalGroup(
statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(statusPanelLayout.createSequentialGroup()
.addComponent(statusPanelSeparator, javax.swing.GroupLayout.PREFERRED_SIZE, 2, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(statusMessageLabel)
.addComponent(statusAnimationLabel)
.addComponent(progressBar, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(3, 3, 3))
);
setComponent(mainPanel);
setMenuBar(menuBar);
setStatusBar(statusPanel);
}// </editor-fold>
private void jTextField2MouseClicked(java.awt.event.MouseEvent evt) {
jTextField2.setText("");// TODO add your handling code here:
}
private void jTextField3MouseClicked(java.awt.event.MouseEvent evt) {
jTextField3.setText(""); // TODO add your handling code here:
}
private void jTextField1MouseClicked(java.awt.event.MouseEvent evt) {
jTextField1.setText(""); // TODO add your handling code here:
}
private void jTextField4MouseClicked(java.awt.event.MouseEvent evt) {
jTextField4.setText(""); // TODO add your handling code here:
}
private void jTextField3KeyReleased(java.awt.event.KeyEvent evt) {
// TODO add your handling code here:
}
private void jTextField3CaretPositionChanged(java.awt.event.InputMethodEvent evt) {
// TODO add your handling code here:
}
private void jTextField5MouseClicked(java.awt.event.MouseEvent evt) {
jTextField5.setText(""); // TODO add your handling code here:
}
private void jTextField6MouseClicked(java.awt.event.MouseEvent evt) {
jTextField6.setText(""); // TODO add your handling code here:
}
private void jTextField7MouseClicked(java.awt.event.MouseEvent evt) {
jTextField7.setText(""); // TODO add your handling code here:
}
private void jTextField3ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jTextField3FocusGained(java.awt.event.FocusEvent evt) {
jTextField3.setText(null);
}
@Action
public void weight() {
float gpi= Float.parseFloat(jTextField2.getText());
float weight= Float.parseFloat(jTextField3.getText());
float novanes= Float.parseFloat(jTextField5.getText());
float vaneweight= Float.parseFloat(jTextField6.getText());
float nock= Float.parseFloat(jTextField7.getText());
float point= Float.parseFloat(jTextField8.getText());
float totalvane= novanes*vaneweight;
float totalweight= (gpi*weight)+totalvane+nock+point;
System.out.println("totalweight = "+totalweight);
jLabel4.setText(""+totalweight+" grains");
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea jTextArea1;
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 jTextField8;
private javax.swing.JPanel mainPanel;
private javax.swing.JMenuBar menuBar;
private javax.swing.JProgressBar progressBar;
private javax.swing.JLabel statusAnimationLabel;
private javax.swing.JLabel statusMessageLabel;
private javax.swing.JPanel statusPanel;
// End of variables declaration
private final Timer messageTimer;
private final Timer busyIconTimer;
private final Icon idleIcon;
private final Icon[] busyIcons = new Icon[15];
private int busyIconIndex = 0;
private JDialog aboutBox;
}
4 个解决方案
解决方案1
4 2013-04-30 15:59:54
then its simple you should use an actionListener 那么它很简单，您应该使用actionListener
private void textfieldFocusGained(java.awt.event.FocusEvent evt) {
textfield.setText("");
}
this will allow you when you press tab the control goes to next field and empty it try this (you may use this as it is in your class constructor) 这将允许您在按下Tab键时将控件移至下一个字段并将其清空，请尝试使用此方法（您可以像在类构造函数中一样使用它）
yourtextField.addFocusListener(new FocusListener() {
public void focusGained(FocusEvent e) {
yourtextField.setText("");
}
public void focusLost(FocusEvent e) {
}
});
now if you are in a textfield and will press the tab button your control will go to the next field and clear its text 现在，如果您在文本字段中，并将按Tab键，则控件将转到下一个字段并清除其文本
解决方案2
3 2013-04-30 16:29:07
I have the instructions for what the user is supposed to enter
See Text Prompt . 参见文本提示 。 It allows you to customize when the prompt is displayed. 它允许您自定义显示提示的时间。
解决方案3
3 已采纳 2013-04-30 18:29:57
right click on your textfield component and goto Events then goto Focus then select focus gained and the code will appear to you as private void 右键单击您的文本字段组件，然后转到“事件”，然后转到“焦点”，然后选择“获得焦点”，该代码将显示为私人空白
jTextField1FocusGained(java.awt.event.FocusEvent evt) {
// TODO add your handling code here:
}
now edit the // TODO add your handling code here: and make it as: 现在编辑// // TODO在此处添加您的处理代码：并将其设置为：
jTextField1FocusGained(java.awt.event.FocusEvent evt) {
jtextField.setText("");
}
so when you will press tab it will gain focus (if you will press from another tab) 因此，当您按下选项卡时，它将获得焦点（如果您从另一个选项卡中按下）
解决方案4
1 2013-04-30 16:01:11
You can use a FocusListener to determine when your JTextField receives focus (ie becomes the "active" component), regardless of whether this occurred due to a mouse click or a tab. 您可以使用FocusListener来确定JTextField何时获得焦点（即成为“活动”组件），而不管这是由于单击鼠标还是使用选项卡引起的。
textField.addFocusListener(new FocusListener() {
@Override
public void focusGained(FocusEvent e) {
textField.setText(null); // Empty the text field when it receives focus
}
@Override
public void focusLost(FocusEvent e) {
// You could do something here when the field loses focus, if you like
}
});
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