问题描述
这个问题可能没有任何意义，因为我非常困惑。我正在NetBeans中使用Swing创建UI。我已经使用Swing UI创建了一个对话框。当我单击主框架上的按钮时，我想打开此对话框。在源代码中，它已经将我的对话框声明为变量。当我尝试在此Dialog变量上使用setVisible时，它会显示框的顶部，标题和退出按钮，没有显示添加到对话框中的按钮或文本。有人告诉我必须声明此对话框，但是自动生成的代码尚未声明该对话框吗？
public class ComputeUI extends javax.swing.JFrame {
/**
* Creates new form ComputeUI
*/
public ComputeUI() {
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() {
GCDDialog = new javax.swing.jdialog();
jPanel1 = new javax.swing.JPanel();
jLabel5 = new javax.swing.JLabel();
jButton3 = new javax.swing.JButton();
jTextField2 = new javax.swing.JTextField();
jLabel9 = new javax.swing.JLabel();
jLabel10 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel7 = new javax.swing.JLabel();
jButton2 = new javax.swing.JButton();
jTextField1 = new javax.swing.JTextField();
jLabel8 = new javax.swing.JLabel();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
jMenuItem2 = new javax.swing.JMenuItem();
jMenu2 = new javax.swing.JMenu();
jMenuItem1 = new javax.swing.JMenuItem();
GCDDialog.setDefaultCloSEOperation(javax.swing.WindowConstants.disPOSE_ON_CLOSE);
GCDDialog.setTitle("GCD");
GCDDialog.setAlwaysOnTop(true);
GCDDialog.setLocationByPlatform(true);
GCDDialog.setModalityType(java.awt.Dialog.ModalityType.APPLICATION_MODAL);
GCDDialog.setName("GCDDialog"); // NOI18N
jLabel5.setText("Number:");
jButton3.setText("Compute");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(20,20,20)
.addComponent(jLabel5)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jTextField2,javax.swing.GroupLayout.PREFERRED_SIZE,81,javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jButton3))
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel9)
.addGap(18,18,18)
.addComponent(jLabel10)))
.addContainerGap(171,Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(22,22,22)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel5)
.addComponent(jTextField2,javax.swing.GroupLayout.DEFAULT_SIZE,javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(25,25,25)
.addComponent(jButton3)
.addGap(33,33,33)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel9)
.addComponent(jLabel10))
.addContainerGap(71,Short.MAX_VALUE))
);
javax.swing.GroupLayout GCDDialogLayout = new javax.swing.GroupLayout(GCDDialog.getContentPane());
GCDDialog.getContentPane().setLayout(GCDDialogLayout);
GCDDialogLayout.setHorizontalGroup(
GCDDialogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1,Short.MAX_VALUE)
);
GCDDialogLayout.setVerticalGroup(
GCDDialogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(GCDDialogLayout.createSequentialGroup()
.addComponent(jPanel1,javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0,Short.MAX_VALUE))
);
GCDDialog.getAccessibleContext().setAccessibleName("GCDDialog");
setDefaultCloSEOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jMenu1.setText("File");
jMenuItem2.setText("Exit");
jMenuItem2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jMenuItem2ActionPerformed(evt);
}
});
jMenu1.add(jMenuItem2);
jMenuBar1.add(jMenu1);
jMenu2.setText("Compute");
jMenuItem1.setText("GCD");
jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jMenuItem1ActionPerformed(evt);
}
});
jMenu2.add(jMenuItem1);
jMenuBar1.add(jMenu2);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,400,Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,279,Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void jMenuItem2ActionPerformed(java.awt.event.ActionEvent evt) {
// Todo add your handling code here:
System.exit(0);
}
private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {
// Todo add your handling code here:
GCDDialog.setVisible(true);
}
/**
* @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(ComputeUI.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ComputeUI.class.getName()).log(java.util.logging.Level.SEVERE,ex);
} catch (illegalaccessexception ex) {
java.util.logging.Logger.getLogger(ComputeUI.class.getName()).log(java.util.logging.Level.SEVERE,ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ComputeUI.class.getName()).log(java.util.logging.Level.SEVERE,ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokelater(new Runnable() {
public void run() {
new ComputeUI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.jdialog GCDDialog;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JLabel jLabel10;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JLabel jLabel9;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem jMenuItem1;
private javax.swing.JMenuItem jMenuItem2;
private javax.swing.JPanel jPanel1;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
// End of variables declaration
}
解决方法
您需要在pack()之前在创建的JDialog GCDDialog上调用setVisible(true)。 （旁注：变量名称绝不能以大写字母开头）
您一次只能将Netbeans表单设计器用于一种表单。因此，您应该拥有ComputeUI.java和GCDDialog.java。这样，Netbeans将正确初始化这两种形式。
要在ComputeUI类中建立两个组件之间的链接，
- 声明一个全局变量：
GCDDialog myDialog; - 在构造函数中：
myDialog = new GCDDialog(...);//如果是通过Netbeans表单设计器创建的，则将自动调用pack（） - 以及在jMenuItem1ActionPerformed中：
myDialog.setVisible(true);