java程序中GUI编程的缺少main方法的代码如何运行,已经省略了部分代码，main应该加在哪里怎么加

import javax.swing.JToolBar;

import javax.swing.SwingConstants;
public class MainFrame extends JFrame implements ActionListener {
InsertPanel ip = null;
SelectPanel sp = null;
SelectscorePanel sp2 = null;
Insert2Panel ip2 = null;
DeletePanel dp=null;
JPanel pframe;
JButton jb1,jb2,jb3;
JMenuItem jm11,jm21, jm22, jm23,jm31, jm32;
CardLayout clayout;
MainFrame(String s){
super(s);
JMenuBar mb = new JMenuBar();
this.setJMenuBar(mb);
JMenu m1 = new JMenu("系统");
JMenu m2 = new JMenu("基本信息");
JMenu m3 = new JMenu("成绩");
mb.add(m1);
mb.add(m2);
mb.add(m3);
jm11 = new JMenuItem("退出系统");
jm21 = new JMenuItem("输入");
jm22 = new JMenuItem("查询");
jm23 = new JMenuItem("删除");
jm31 = new JMenuItem("输入成绩");
jm32 = new JMenuItem("查询成绩");
m1.add(jm11);
m2.add(jm21);
m2.add(jm22);
m2.add(jm23);
m3.add(jm31);
m3.add(jm32);
jb1 = new JButton(i1);
jb2 = new JButton(i2);
jb3 = new JButton(i3);
JToolBar tb = new JToolBar("系统工具");
tb.add(jb1);
tb.add(jb2);
tb.add(jb3);
add(tb, BorderLayout.NORTH);
jm11.addActionListener(this);
jm21.addActionListener(this);
jm22.addActionListener(this);
jm23.addActionListener(this);
jm31.addActionListener(this);
jm32.addActionListener(this);
jb1.addActionListener(this);
jb2.addActionListener(this);
jb3.addActionListener(this);
clayout = new CardLayout();
pframe = new JPanel(clayout);
add(pframe);
JPanel mainp = new JPanel(new BorderLayout());
JLabel mainl = new JLabel("学生信息管理平台",SwingConstants.CENTER);
mainl.setFont(new Font("Serif",Font.BOLD,30));
mainp.add(mainl);
pframe.add(mainp,"main");
clayout.show(pframe, "main");
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==jm21|e.getSource()==jb1){
if(ip == null) {
ip = new InsertPanel();
pframe.add(ip,"insert");
}
clayout.show(pframe, "insert");
this.setTitle("输入学生信息");
}
else if(e.getSource()==jm22|e.getSource()==jb2){
if(sp == null) {
sp = new SelectPanel();
pframe.add(sp,"select");
}
clayout.show(pframe, "select");
this.setTitle("查询学生信息");
}
else if(e.getSource()==jm22|e.getSource()==jb2){
if(sp == null) {
sp = new SelectPanel();
pframe.add(sp,"select");
}
clayout.show(pframe, "select");
this.setTitle("查询学生信息");
}
else if(e.getSource()==jm23)
{if(dp == null) {
dp = new DeletePanel();
pframe.add(dp,"delete");
}
clayout.show(pframe, "delete");
this.setTitle("输入学生成绩");}
else if(e.getSource()==jm31)
{if(ip2 == null) {
ip2 = new Insert2Panel();
pframe.add(ip2,"insert2");
}
clayout.show(pframe, "insert2");
this.setTitle("输入学生成绩");}
else if(e.getSource()==jm32)
{if(sp2 == null) {
sp2 = new SelectscorePanel();
pframe.add(sp2,"select2");
}
clayout.show(pframe, "select2");
this.setTitle("查询学生成绩");}
else if((e.getSource()==jm11)|(e.getSource()==jb3))
System.exit(0);
}
}

加了两处 // add
你看看，　　
------------------------------------------------------------------------------------------------
public class MainFrame extends JFrame implements ActionListener {
// add
public static void main(String[] args){
new MainFrame("MainFrame");
}
InsertPanel ip = null;
SelectPanel sp = null;
SelectscorePanel sp2 = null;
Insert2Panel ip2 = null;
DeletePanel dp = null;
JPanel pframe;
JButton jb1, jb2, jb3;
JMenuItem jm11, jm21, jm22, jm23, jm31, jm32;
CardLayout clayout;
MainFrame(String s) {
super(s);
JMenuBar mb = new JMenuBar();
this.setJMenuBar(mb);
JMenu m1 = new JMenu("系统");
JMenu m2 = new JMenu("基本信息");
JMenu m3 = new JMenu("成绩");
mb.add(m1);
mb.add(m2);
mb.add(m3);
jm11 = new JMenuItem("退出系统");
jm21 = new JMenuItem("输入");
jm22 = new JMenuItem("查询");
jm23 = new JMenuItem("删除");
jm31 = new JMenuItem("输入成绩");
jm32 = new JMenuItem("查询成绩");
m1.add(jm11);
m2.add(jm21);
m2.add(jm22);
m2.add(jm23);
m3.add(jm31);
m3.add(jm32);
jb1 = new JButton(i1);
jb2 = new JButton(i2);
jb3 = new JButton(i3);
JToolBar tb = new JToolBar("系统工具");
tb.add(jb1);
tb.add(jb2);
tb.add(jb3);
add(tb, BorderLayout.NORTH);
jm11.addActionListener(this);
jm21.addActionListener(this);
jm22.addActionListener(this);
jm23.addActionListener(this);
jm31.addActionListener(this);
jm32.addActionListener(this);
jb1.addActionListener(this);
jb2.addActionListener(this);
jb3.addActionListener(this);
clayout = new CardLayout();
pframe = new JPanel(clayout);
add(pframe);
JPanel mainp = new JPanel(new BorderLayout());
JLabel mainl = new JLabel("学生信息管理平台", SwingConstants.CENTER);
mainl.setFont(new Font("Serif", Font.BOLD, 30));
mainp.add(mainl);
pframe.add(mainp, "main");
clayout.show(pframe, "main");
// add
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == jm21 | e.getSource() == jb1) {
if (ip == null) {
ip = new InsertPanel();
pframe.add(ip, "insert");
}
clayout.show(pframe, "insert");
this.setTitle("输入学生信息");
} else if (e.getSource() == jm22 | e.getSource() == jb2) {
if (sp == null) {
sp = new SelectPanel();
pframe.add(sp, "select");
}
clayout.show(pframe, "select");
this.setTitle("查询学生信息");
} else if (e.getSource() == jm22 | e.getSource() == jb2) {
if (sp == null) {
sp = new SelectPanel();
pframe.add(sp, "select");
}
clayout.show(pframe, "select");
this.setTitle("查询学生信息");
} else if (e.getSource() == jm23) {
if (dp == null) {
dp = new DeletePanel();
pframe.add(dp, "delete");
}
clayout.show(pframe, "delete");
this.setTitle("输入学生成绩");
} else if (e.getSource() == jm31) {
if (ip2 == null) {
ip2 = new Insert2Panel();
pframe.add(ip2, "insert2");
}
clayout.show(pframe, "insert2");
this.setTitle("输入学生成绩");
} else if (e.getSource() == jm32) {
if (sp2 == null) {
sp2 = new SelectscorePanel();
pframe.add(sp2, "select2");
}
clayout.show(pframe, "select2");
this.setTitle("查询学生成绩");
} else if ((e.getSource() == jm11) | (e.getSource() == jb3))
System.exit(0);
}
}

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