单击"在 Netbeans 中运行"时不显示 Jpanel

Question

我目前正在做一个Java桌面项目，奇怪的是，每当我点击运行按钮时，Jpanel都没有出现。我宣布这是主要的，但它仍然不起作用。有什么想法吗？

这是我的 Jpanel 表单的代码。

提前谢谢！.

package consumidor;

public class ventana extends javax.swing.JPanel {

public ventana() {
initComponents();
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ventana().setVisible(true);
}
});
}

@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {
jInternalFrame1 = new javax.swing.JInternalFrame();
jPanel2 = new javax.swing.JPanel();
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
buscarProductoTxt = new javax.swing.JTextField();
btnBuscarProducto = new javax.swing.JButton();
jScrollPane1 = new javax.swing.JScrollPane();
buscarProductoArea = new javax.swing.JTextArea();
jInternalFrame1.setVisible(true);
javax.swing.GroupLayout jInternalFrame1Layout = new javax.swing.GroupLayout(jInternalFrame1.getContentPane());
jInternalFrame1.getContentPane().setLayout(jInternalFrame1Layout);
jInternalFrame1Layout.setHorizontalGroup(
jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
jInternalFrame1Layout.setVerticalGroup(
jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
jLabel1.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
jLabel1.setText("Buscar producto por rut");
jLabel2.setText("Ingresar rut del proveedor");
buscarProductoTxt.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
buscarProductoTxtActionPerformed(evt);
}
});
btnBuscarProducto.setText("Consultar");
btnBuscarProducto.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnBuscarProductoActionPerformed(evt);
}
});
buscarProductoArea.setColumns(20);
buscarProductoArea.setRows(5);
jScrollPane1.setViewportView(buscarProductoArea);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jLabel1)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(buscarProductoTxt, javax.swing.GroupLayout.PREFERRED_SIZE, 65, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(btnBuscarProducto))
.addComponent(jScrollPane1))
.addContainerGap(24, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(buscarProductoTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(btnBuscarProducto, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE))
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 56, Short.MAX_VALUE))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, 324, Short.MAX_VALUE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
);
}// </editor-fold>                        


private void buscarProductoTxtActionPerformed(java.awt.event.ActionEvent evt) {                                                  
}                                                 
private void btnBuscarProductoActionPerformed(java.awt.event.ActionEvent evt) {                                                  
String producto=buscarProductoTxt.getText();
buscarProductoRut(producto);
buscarProductoArea.setText("Rut proveedor: "+mostrarRut()+", Descripcion"
+ ": "+mostrarDecripcion());


}                                                 

// Variables declaration - do not modify                     
private javax.swing.JButton btnBuscarProducto;
private javax.swing.JTextArea buscarProductoArea;
private javax.swing.JTextField buscarProductoTxt;
private javax.swing.JInternalFrame jInternalFrame1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JScrollPane jScrollPane1;
// End of variables declaration                   
private static boolean buscarProductoRut(java.lang.String arg0) {
webservice.ProcesoProductos_Service service = new webservice.ProcesoProductos_Service();
webservice.ProcesoProductos port = service.getProcesoProductosPort();
return port.buscarProductoRut(arg0);
}
private static String mostrarRut() {
webservice.ProcesoProductos_Service service = new webservice.ProcesoProductos_Service();
webservice.ProcesoProductos port = service.getProcesoProductosPort();
return port.mostrarRut();
}
private static String mostrarDecripcion() {
webservice.ProcesoProductos_Service service = new webservice.ProcesoProductos_Service();
webservice.ProcesoProductos port = service.getProcesoProductosPort();
return port.mostrarDecripcion();
}        
}

Answer 1

这没什么"奇怪的"。你的 ventana 类是一个 JPanel，是的，你创建它并设置它可见，但 JPanel 本身不能显示，事实上要让它显示，它需要是一个可见的"顶级窗口"的一部分，如 JFrame 或 JDialog。因此，如果要在单独的对话框窗口中显示此 JPanel，请将其放入 JDialog，pack()对话框，然后将对话框设置为可见。或者快速而肮脏的方法是将ventana JPanel放入JOptionPane中。例如，

JOptionPane.showMessageDialog(null, new ventana());

然后，JOptionPane将创建并显示一个模态JDialog，该模式将显示您的ventana对象。

请注意，ventana 类名应以大写字母开头，就像所有 Java 类名一样。