选中(Netbeans)时如何使jtextfield文本消失

时间:2013-04-30 15:47:27

标签: java swing netbeans tabs jtextfield

我正在研究一个gui,它有多个用户输入数据的文本字段。当程序打开时,我会指示用户应该在文本字段中输入什么作为“文本”。我将它设置为当用户单击文本字段时,文本将消失,但我无法弄清楚如何将其标记为下一个jtextfield时消失。我希望用户能够点击第一个文本字段,而不必再次使用鼠标,也不必在退格或del上疯狂。感谢

    /*
 * 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 个答案:

答案 0 :(得分:4)

然后很简单你应该使用actionListener

   private void textfieldFocusGained(java.awt.event.FocusEvent evt) {                               
   textfield.setText("");
   }   

这将允许你按Tab键时控件转到下一个字段并清空它试试这个(你可以在你的类构造函数中使用它)

yourtextField.addFocusListener(new FocusListener() {


public void focusGained(FocusEvent e) {
    yourtextField.setText(""); 
}


public void focusLost(FocusEvent e) {

}

});      

现在,如果您在文本字段中并按下标签按钮,您的控件将转到下一个字段并清除其文本

答案 1 :(得分:3)

  

我有关于用户应该输入的内容的说明

Text Prompt。它允许您自定义何时显示提示。

答案 2 :(得分:3)

右键单击你的文本域组件并转到事件,然后转到焦点,然后选择焦点获得,代码将显示为私有空白

    jTextField1FocusGained(java.awt.event.FocusEvent evt) {                                        
    // TODO add your handling code here:
    }   

现在编辑// TODO在这里添加您的处理代码:并将其设为:

    jTextField1FocusGained(java.awt.event.FocusEvent evt) {                                        
     jtextField.setText(""); 
    }   

因此,当您按Tab键时,它将获得焦点(如果您将从另一个标签页按下)

答案 3 :(得分:1)

您可以使用FocusListener确定JTextField何时获得焦点(即成为“有效”组件),无论是否由于鼠标单击或标签而发生。

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
    }

});