我正在使用Netbeans。我设置了一个图形程序来作图。我覆盖了3个JPanel paintComponent方法，只是为了入门，但是这些方法没有被调用。
我有可以运行的程序。我的新替代代码看起来相同。我已经尝试了很多东西，但想法却用光了。我是第一次使用Borderlayout，但这应该不会引起问题。
import java.awt.Graphics;
import java.awt.Graphics2D;
/*
* To change this license header, choose License Headers in Project
*Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
public class MainForm extends javax.swing.JFrame
{
/**
* Creates new form NewJFrame
*/
public MainForm()
{
initComponents();
initProgram();
}
private void initProgram()
{
System.out.println("InitProgram");
}
/**
* 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()
{
pnlPrintPanel = new javax.swing.JPanel();
pnlGraphForm = new javax.swing.JPanel();
pnlGraph = new javax.swing.JPanel();
jLabel2 = new javax.swing.JLabel();
jLabel1 = new javax.swing.JLabel();
pnlInputPanel = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
jMenu2 = new javax.swing.JMenu();
setDefaultCloseOperation
(javax.swing.WindowConstants.EXIT_ON_CLOSE);
pnlGraphForm.setBorder
(javax.swing.BorderFactory.createBevelBorder(
javax.swing.border.BevelBorder.RAISED));
pnlGraph.setBorder
(javax.swing.BorderFactory.createBevelBorder(
javax.swing.border.BevelBorder.RAISED));
jLabel2.setText("jLabel2");
javax.swing.GroupLayout pnlGraphLayout =
new javax.swing.GroupLayout(pnlGraph);
pnlGraph.setLayout(pnlGraphLayout);
pnlGraphLayout.setHorizontalGroup(
pnlGraphLayout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING,
pnlGraphLayout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE)
.addComponent(jLabel2)
.addGap(277, 277, 277))
);
pnlGraphLayout.setVerticalGroup(
pnlGraphLayout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(pnlGraphLayout.createSequentialGroup()
.addGap(101, 101, 101)
.addComponent(jLabel2)
.addContainerGap(204, Short.MAX_VALUE))
);
jLabel1.setText("jLabel1");
javax.swing.GroupLayout pnlGraphFormLayout =
new javax.swing.GroupLayout(pnlGraphForm);
pnlGraphForm.setLayout(pnlGraphFormLayout);
pnlGraphFormLayout.setHorizontalGroup(
pnlGraphFormLayout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(pnlGraphFormLayout.createSequentialGroup()
.addGap(30, 30, 30)
.addComponent(pnlGraph, javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
.addGroup(pnlGraphFormLayout.createSequentialGroup()
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE,
59, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE))
);
pnlGraphFormLayout.setVerticalGroup(
pnlGraphFormLayout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(pnlGraphFormLayout.createSequentialGroup()
.addContainerGap()
.addComponent(pnlGraph, javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addPreferredGap(
javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel1)
.addContainerGap())
);
pnlGraph = new javax.swing.JPanel()
{
//@Override
//public void paint(Graphics g)
@Override
public void paintComponent(Graphics g)
{
System.out.println("In pnlGraph.paintComponent");
//super.paint(g);
/*
if (grapher == null)
{
return;
}
*/
super.paintComponent(g);
// grapher.drawSlate((Graphics2D)g);
pack();
}
};
pnlInputPanel.setBorder(
javax.swing.BorderFactory.createBevelBorder(
javax.swing.border.BevelBorder.RAISED));
jButton1.setText("jButton1");
jButton1.addActionListener(new java.awt.event.ActionListener()
{
public void actionPerformed(java.awt.event.ActionEvent evt)
{
jButton1ActionPerformed(evt);
}
});
javax.swing.GroupLayout pnlInputPanelLayout =
new javax.swing.GroupLayout(pnlInputPanel);
pnlInputPanel.setLayout(pnlInputPanelLayout);
pnlInputPanelLayout.setHorizontalGroup(
pnlInputPanelLayout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(pnlInputPanelLayout.createSequentialGroup()
.addGap(271, 271, 271)
.addComponent(jButton1)
.addContainerGap(297, Short.MAX_VALUE))
);
pnlInputPanelLayout.setVerticalGroup(
pnlInputPanelLayout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(pnlInputPanelLayout.createSequentialGroup()
.addGap(59, 59, 59)
.addComponent(jButton1)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE))
);
javax.swing.GroupLayout pnlPrintPanelLayout =
new javax.swing.GroupLayout(pnlPrintPanel);
pnlPrintPanel.setLayout(pnlPrintPanelLayout);
pnlPrintPanelLayout.setHorizontalGroup(
pnlPrintPanelLayout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(pnlPrintPanelLayout.createSequentialGroup()
.addContainerGap()
.addGroup(pnlPrintPanelLayout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(pnlPrintPanelLayout.createSequentialGroup()
.addComponent(pnlInputPanel,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
.addComponent(pnlGraphForm,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
);
pnlPrintPanelLayout.setVerticalGroup(
pnlPrintPanelLayout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(pnlPrintPanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(pnlGraphForm,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(pnlInputPanel,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE))
);
pnlGraphForm = new javax.swing.JPanel()
{
//@Override
//public void paint(Graphics g)
@Override
public void paintComponent(Graphics g)
{
System.out.println("In pnlGraphForm.paintComponent");
//super.paint(g);
/*
if (grapher == null)
{
return;
}
*/
super.paintComponent(g);
// grapher.drawSlate((Graphics2D)g);
pack();
}
};
getContentPane().add(pnlPrintPanel, java.awt.BorderLayout.CENTER);
jMenu1.setText("File");
jMenuBar1.add(jMenu1);
jMenu2.setText("Edit");
jMenuBar1.add(jMenu2);
setJMenuBar(jMenuBar1);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt)
{
System.out.println("BUTTON");
pnlGraphForm.paintComponents((Graphics2D)
pnlGraphForm.getGraphics());
}
/**
* @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(MainForm.class.getName())
.log(java.util.logging.Level.SEVERE, null, ex);
}
catch (InstantiationException ex)
{
java.util.logging.Logger.getLogger(
MainForm.class.getName()).log(
java.util.logging.Level.SEVERE, null, ex);
}
catch (IllegalAccessException ex)
{
java.util.logging.Logger.getLogger(
MainForm.class.getName()).log(
java.util.logging.Level.SEVERE, null, ex);
}
catch (javax.swing.UnsupportedLookAndFeelException ex)
{
java.util.logging.Logger.getLogger(
MainForm.class.getName()).log(
java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable()
{
public void run()
{
new MainForm().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JPanel pnlGraph;
private javax.swing.JPanel pnlGraphForm;
private javax.swing.JPanel pnlInputPanel;
private javax.swing.JPanel pnlPrintPanel;
// End of variables declaration
}
在这个阶段，我希望看到打印的面板/方法名称，但是没有发生