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java基础记事本代码 java简易记事本( 四 )

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}
if (e.getActionCommand()=="√x")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=Math.sqrt(d1);
ta.setText( d2.toString());
}
if (e.getActionCommand()=="x!")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
if (d10)
{
ta.setText( "error");
}
else if (d1==0)
{
ta.setText( "0.0");
}
else {
for (int k=1;k=d1 ;k++ )
d4=d4*k;
ta.setText( d4.toString());
}
}
if (e.getActionCommand()=="sin")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=Math.sin(3.1415926*d1/180);
ta.setText( d2.toString());
}
}
}
简单记事本的java程序代码天啊 ，  冖_Na0 为什么会有我编的记事本代码呢？？？呵呵……你肯定是“请教”过我的吧？？
呵呵……我自己编了一个，不过呢，没有windows那么多的功能啊 。
涉及到两个文件：
第一个文件中的代码：
package MyProject;
import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JFrame;
import java.awt.Dimension;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JLabel;
import java.awt.Rectangle;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import java.awt.datatransfer.*;
import java.io.*;
public class MainFrame extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel jContentPane = null;
private JMenuBar jJMenuBar = null;
private JMenu jMenu = null;
private JMenu jMenu1 = null;
private JMenu jMenu2 = null;
private JMenuItem jMenuItem = null;
private JMenuItem jMenuItem1 = null;
private JMenuItem jMenuItem2 = null;
private JMenuItem jMenuItem3 = null;
private JLabel jLabel = null;
private JScrollPane jScrollPane = null;
private JTextArea jTextArea = null;
private JMenuItem jMenuItem4 = null;
private JMenuItem jMenuItem5 = null;
private JMenuItem jMenuItem6 = null;
private JMenuItem jMenuItem7 = null;
private static MainFrame myMainFrame=null;
private static String textstr="";///用于记录文本文件的路径
private File myFile=null;
private FileReader myrder=null;
private FileWriter mywr=null;
/**
* This is the default constructor
*/
public MainFrame() {
super();
initialize();
}
/**
* This method initializes this
*
* @return void
*/
private void initialize() {
this.setSize(412, 350);
this.setJMenuBar(getJJMenuBar());
this.setContentPane(getJContentPane());
this.setTitle("JFrame");
this.addWindowListener(new java.awt.event.WindowAdapter() {
public void windowActivated(java.awt.event.WindowEvent e) {
if(!textstr.equals("")){
try{
myFile=new File(textstr);
if(!myFile.exists()){
myFile.createNewFile();
}
myrder=new FileReader(myFile);
char[] mychar=new char[(int)myFile.length()];
myrder.read(mychar);
String tmp=new String(mychar);
jTextArea.setText(tmp);
myrder.close();
}
catch(Exception ee){
ee.printStackTrace();
}
}
}
public void windowClosing(java.awt.event.WindowEvent e) {
System.exit(0);
}
});
this.setVisible(true);
myMainFrame=this;
}
/**
* This method initializes jContentPane
*
* @return javax.swing.JPanel
*/
private JPanel getJContentPane() {
if (jContentPane == null) {
jLabel = new JLabel();
jLabel.setBounds(new Rectangle(15, 18, 65, 18));
jLabel.setText("文件内容：");
jContentPane = new JPanel();

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