小弟Java新手,请诸位大侠帮忙看看为什么这个编写的菜单无法显示
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JToolBar;public class cai extends JFrame implements ActionListener{ private static final long serialVersionUID = 1L;
private JPanel jContentPane = null;
private JMenuBar menuMB = null;
private JTextArea pageTA = null;
private String scratchpad="";
private JMenu fileM = null;
private JMenuItem exitI = null;
private JMenu editM = null;
private JMenuItem cutI = null;
private JMenuItem copyI = null;
private JMenuItem pasteI = null;
private JMenuItem SelectI = null;
/**
* This is the default constructor
*/
public cai() {
super();
initialize();
} /**
* This method initializes this
*
* @return void
*/
private void initialize() {
this.setSize(500, 200);
this.setJMenuBar(menuMB);
this.setContentPane(getJContentPane());
this.setTitle("Simple Text Editor");
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.add(new JScrollPane(pageTA));
this.getFileM();
this.getEditM();
} /**
* This method initializes jContentPane
*
* @return javax.swing.JPanel
*/
private JPanel getJContentPane() {
if (jContentPane == null) {
jContentPane = new JPanel();
jContentPane.setLayout(new BorderLayout());
jContentPane.add(getPageTA(), BorderLayout.CENTER);
jContentPane.setVisible(true);
this.setJMenuBar(menuMB);
this.setContentPane(getJContentPane());
this.setTitle("Simple Text Editor");
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.add(new JScrollPane(pageTA));
this.getFileM();
this.getEditM();
}
return jContentPane;
} @Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub\
JMenuItem mItem=(JMenuItem) e.getSource();
if(mItem==exitI){
System.exit(0);
}
else if(mItem==cutI)
{
scratchpad=pageTA.getSelectedText();
pageTA.replaceRange("",
pageTA.getSelectionStart(),
pageTA.getSelectionEnd()
);
}
else if(mItem==copyI)
{
scratchpad=pageTA.getSelectedText();
}
else if(mItem==pasteI)
{
pageTA.insert(scratchpad, pageTA.getCaretPosition());
}
else if(mItem==SelectI)
{
pageTA.selectAll();
}
} /**
* This method initializes menuMB
*
* @return javax.swing.JMenuBar
*/
private JMenuBar getMenuMB() {
if (menuMB == null) {
menuMB = new JMenuBar();
menuMB.add(getFileM());
menuMB.add(getEditM());
}
return menuMB;
} /**
* This method initializes pageTA
*
* @return javax.swing.JTextArea
*/
private JTextArea getPageTA() {
if (pageTA == null) {
pageTA = new JTextArea();
}
pageTA.setLineWrap(true);
return pageTA;
} /**
* This method initializes fileM
*
* @return javax.swing.JMenu
*/
private JMenu getFileM() {
if (fileM == null) {
fileM = new JMenu("File"); fileM.add(getExitI());
exitI.addActionListener(this);
}
return fileM;
} /**
* This method initializes exitI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getExitI() {
if (exitI == null) {
exitI = new JMenuItem("Exit");
}
return exitI;
} /**
* This method initializes editM
*
* @return javax.swing.JMenu
*/
private JMenu getEditM() {
if (editM == null) {
editM = new JMenu("Edit");
editM.add(getCutI());
cutI.addActionListener(this);
editM.add(getCopyI());
copyI.addActionListener(this);
editM.add(getPasteI());
pasteI.addActionListener(this);
editM.add(getSelectI());
SelectI.addActionListener(this);
}
return editM;
} /**
* This method initializes cutI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getCutI() {
if (cutI == null) {
cutI = new JMenuItem("CUT");
}
return cutI;
} /**
* This method initializes copyI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getCopyI() {
if (copyI == null) {
copyI = new JMenuItem("Copy");
}
return copyI;
} /**
* This method initializes pasteI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getPasteI() {
if (pasteI == null) {
pasteI = new JMenuItem("Paste");
}
return pasteI;
} /**
* This method initializes SelectI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getSelectI() {
if (SelectI == null) {
SelectI = new JMenuItem("Select All");
}
return SelectI;
} /**
* This method initializes jMenuItem
*
* @return javax.swing.JMenuItem
*/ /**
* This method initializes fileM
*
* @return javax.swing.JMenu
*/
public static void main(String args[])
{
cai texted =new cai();
}
} // @jve:decl-index=0:visual-constraint="233,19"
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JToolBar;public class cai extends JFrame implements ActionListener{ private static final long serialVersionUID = 1L;
private JPanel jContentPane = null;
private JMenuBar menuMB = null;
private JTextArea pageTA = null;
private String scratchpad="";
private JMenu fileM = null;
private JMenuItem exitI = null;
private JMenu editM = null;
private JMenuItem cutI = null;
private JMenuItem copyI = null;
private JMenuItem pasteI = null;
private JMenuItem SelectI = null;
/**
* This is the default constructor
*/
public cai() {
super();
initialize();
} /**
* This method initializes this
*
* @return void
*/
private void initialize() {
this.setSize(500, 200);
this.setJMenuBar(menuMB);
this.setContentPane(getJContentPane());
this.setTitle("Simple Text Editor");
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.add(new JScrollPane(pageTA));
this.getFileM();
this.getEditM();
} /**
* This method initializes jContentPane
*
* @return javax.swing.JPanel
*/
private JPanel getJContentPane() {
if (jContentPane == null) {
jContentPane = new JPanel();
jContentPane.setLayout(new BorderLayout());
jContentPane.add(getPageTA(), BorderLayout.CENTER);
jContentPane.setVisible(true);
this.setJMenuBar(menuMB);
this.setContentPane(getJContentPane());
this.setTitle("Simple Text Editor");
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.add(new JScrollPane(pageTA));
this.getFileM();
this.getEditM();
}
return jContentPane;
} @Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub\
JMenuItem mItem=(JMenuItem) e.getSource();
if(mItem==exitI){
System.exit(0);
}
else if(mItem==cutI)
{
scratchpad=pageTA.getSelectedText();
pageTA.replaceRange("",
pageTA.getSelectionStart(),
pageTA.getSelectionEnd()
);
}
else if(mItem==copyI)
{
scratchpad=pageTA.getSelectedText();
}
else if(mItem==pasteI)
{
pageTA.insert(scratchpad, pageTA.getCaretPosition());
}
else if(mItem==SelectI)
{
pageTA.selectAll();
}
} /**
* This method initializes menuMB
*
* @return javax.swing.JMenuBar
*/
private JMenuBar getMenuMB() {
if (menuMB == null) {
menuMB = new JMenuBar();
menuMB.add(getFileM());
menuMB.add(getEditM());
}
return menuMB;
} /**
* This method initializes pageTA
*
* @return javax.swing.JTextArea
*/
private JTextArea getPageTA() {
if (pageTA == null) {
pageTA = new JTextArea();
}
pageTA.setLineWrap(true);
return pageTA;
} /**
* This method initializes fileM
*
* @return javax.swing.JMenu
*/
private JMenu getFileM() {
if (fileM == null) {
fileM = new JMenu("File"); fileM.add(getExitI());
exitI.addActionListener(this);
}
return fileM;
} /**
* This method initializes exitI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getExitI() {
if (exitI == null) {
exitI = new JMenuItem("Exit");
}
return exitI;
} /**
* This method initializes editM
*
* @return javax.swing.JMenu
*/
private JMenu getEditM() {
if (editM == null) {
editM = new JMenu("Edit");
editM.add(getCutI());
cutI.addActionListener(this);
editM.add(getCopyI());
copyI.addActionListener(this);
editM.add(getPasteI());
pasteI.addActionListener(this);
editM.add(getSelectI());
SelectI.addActionListener(this);
}
return editM;
} /**
* This method initializes cutI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getCutI() {
if (cutI == null) {
cutI = new JMenuItem("CUT");
}
return cutI;
} /**
* This method initializes copyI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getCopyI() {
if (copyI == null) {
copyI = new JMenuItem("Copy");
}
return copyI;
} /**
* This method initializes pasteI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getPasteI() {
if (pasteI == null) {
pasteI = new JMenuItem("Paste");
}
return pasteI;
} /**
* This method initializes SelectI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getSelectI() {
if (SelectI == null) {
SelectI = new JMenuItem("Select All");
}
return SelectI;
} /**
* This method initializes jMenuItem
*
* @return javax.swing.JMenuItem
*/ /**
* This method initializes fileM
*
* @return javax.swing.JMenu
*/
public static void main(String args[])
{
cai texted =new cai();
}
} // @jve:decl-index=0:visual-constraint="233,19"
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import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JToolBar;public class cai extends JFrame implements ActionListener{
private static final long serialVersionUID = 1L;
private JPanel jContentPane = null;
private JMenuBar menuMB = null;
private JTextArea pageTA = null;
private String scratchpad="";
private JMenu fileM = null;
private JMenuItem exitI = null;
private JMenu editM = null;
private JMenuItem cutI = null;
private JMenuItem copyI = null;
private JMenuItem pasteI = null;
private JMenuItem SelectI = null;
/**
* This is the default constructor
*/
public cai() {
super();
initialize();
}
/**
* This method initializes this
*
* @return void
*/
private void initialize() {
this.setSize(500, 200);
//this.setJMenuBar(menuMB);
this.setJMenuBar(getMenuMB()); //调用你写的getMenuMB函数
this.setContentPane(getJContentPane());
this.setTitle("Simple Text Editor");
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.add(new JScrollPane(pageTA));
this.getFileM();
this.getEditM();
} /**
* This method initializes jContentPane
*
* @return javax.swing.JPanel
*/
private JPanel getJContentPane() {
if (jContentPane == null) {
jContentPane = new JPanel();
jContentPane.setLayout(new BorderLayout());
jContentPane.add(getPageTA(), BorderLayout.CENTER);
jContentPane.setVisible(true);
this.setJMenuBar(menuMB);
this.setContentPane(getJContentPane());
this.setTitle("Simple Text Editor");
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.add(new JScrollPane(pageTA));
this.getFileM();
this.getEditM();
}
return jContentPane;
} @Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub\
JMenuItem mItem=(JMenuItem) e.getSource();
if(mItem==exitI){
System.exit(0);
}
else if(mItem==cutI)
{
scratchpad=pageTA.getSelectedText();
pageTA.replaceRange("",
pageTA.getSelectionStart(),
pageTA.getSelectionEnd()
);
}
else if(mItem==copyI)
{
scratchpad=pageTA.getSelectedText();
}
else if(mItem==pasteI)
{
pageTA.insert(scratchpad, pageTA.getCaretPosition());
}
else if(mItem==SelectI)
{
pageTA.selectAll();
}
} /**
* This method initializes menuMB
*
* @return javax.swing.JMenuBar
*/
private JMenuBar getMenuMB() {
if (menuMB == null) {
menuMB = new JMenuBar();
menuMB.add(getFileM());
menuMB.add(getEditM());
}
return menuMB;
} /**
* This method initializes pageTA
*
* @return javax.swing.JTextArea
*/
private JTextArea getPageTA() {
if (pageTA == null) {
pageTA = new JTextArea();
}
pageTA.setLineWrap(true);
return pageTA;
} /**
* This method initializes fileM
*
* @return javax.swing.JMenu
*/
private JMenu getFileM() {
if (fileM == null) {
fileM = new JMenu("File"); fileM.add(getExitI());
exitI.addActionListener(this);
} return fileM;
} /**
* This method initializes exitI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getExitI() {
if (exitI == null) {
exitI = new JMenuItem("Exit");
}
return exitI;
} /**
* This method initializes editM
*
* @return javax.swing.JMenu
*/
private JMenu getEditM() {
if (editM == null) {
editM = new JMenu("Edit");
editM.add(getCutI());
cutI.addActionListener(this);
editM.add(getCopyI());
copyI.addActionListener(this);
editM.add(getPasteI());
pasteI.addActionListener(this);
editM.add(getSelectI());
SelectI.addActionListener(this);
}
return editM;
} /**
* This method initializes cutI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getCutI() {
if (cutI == null) {
cutI = new JMenuItem("CUT");
}
return cutI;
} /**
* This method initializes copyI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getCopyI() {
if (copyI == null) {
copyI = new JMenuItem("Copy");
}
return copyI;
} /**
* This method initializes pasteI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getPasteI() {
if (pasteI == null) {
pasteI = new JMenuItem("Paste");
}
return pasteI;
} /**
* This method initializes SelectI
*
* @return javax.swing.JMenuItem
*/
private JMenuItem getSelectI() {
if (SelectI == null) {
SelectI = new JMenuItem("Select All");
} return SelectI;
} /**
* This method initializes jMenuItem
*
* @return javax.swing.JMenuItem
*/ /**
* This method initializes fileM
*
* @return javax.swing.JMenu
*/
public static void main(String args[])
{
cai texted =new cai();
}
} // @jve:decl-index=0:visual-constraint="233,19"