java文本编辑器

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.swing.event.*;

public class Frame1 extends JFrame {
    Container c = new Container();

    Label la = new Label("");

    JMenuBar jmb = new JMenuBar();

    JMenu file = new JMenu("文件");

    JMenu edit = new JMenu("编辑");

    JMenu option = new JMenu("字体");

    JMenu about = new JMenu("关于");

    JMenuItem open = new JMenuItem("打开");

    JMenuItem save = new JMenuItem("另存为");

    JMenuItem exit = new JMenuItem("退出");

    JMenuItem copy = new JMenuItem("复制");

    JMenuItem cut = new JMenuItem("剪切");

    JMenuItem paste = new JMenuItem("粘贴");

    JMenuItem delete = new JMenuItem("删除");

    JMenuItem italic = new JMenuItem("斜体");

    JMenuItem bold = new JMenuItem("粗体");

    JMenuItem version = new JMenuItem("关于记事本");

    JTextPane ta = new JTextPane();

    JFileChooser chooser = new JFileChooser();

    FileInputStream filestream = null;

    myversion exitversion = new myversion();

    String selected = new String();

    int dot, mark;