Implementation of the Java window---calculator (add)

/***********************************************************************
* Module:Caculater.java
* Author:administrator
* Created:2004-12-7 23:48:21
* Purpose:
***********************************************************************/
Package org.heixue.test.applet;

/**
* @author Administrator
*/
Import javax.swing.*;
Import java.awt.event.*;
Import java.awt.*;
public class Calculater extends JApplet {
jmenu[] Menus = {new JMenu ("Options"), New JMenu ("About")};
jmenuitem[] items = {New JMenuItem ("about"), new JMenuItem ("Set Background Color")};
JButton B1 = new JButton ("Operation");
Joptionpane b2 = new Joptionpane ("Operation ...");
JTextField txt1 = new JTextField ("100", 10);
JTextField txt2 = new JTextField ("200", 10);
JTextField txt3 = new JTextField (20);
jlabel[] Label = {New JLabel ("+"), new JLabel ("=")};
JColorChooser JCC = new JColorChooser ();

ActionListener al = new ActionListener () {
public void actionperformed (ActionEvent e) {
String name = ((JButton) E.getsource ()). GetText ();
int m = Joptionpane.showconfirmdialog (null, "Continue operation?", "OK", joptionpane.yes_no_option);
if (m==0) {
String OP1 = Txt1.gettext ();
String OP2 = Txt2.gettext ();
Txt3.settext (bussiness (OP1,OP2));
Txt3.settext (m+ "");
}
}
};
ActionListener Al2 = new ActionListener () {
public void actionperformed (ActionEvent e) {
Joptionpane.showmessagedialog (NULL, "Author: Black Snow Group", "About ...", joptionpane.information_message);
}
};
ActionListener Al3 = new ActionListener () {
public void actionperformed (ActionEvent e) {

Jcolorchooser.createdialog (NULL, "Background color ...", true,jcc,al4,null). Show ();
}
};
ActionListener Al4 = new ActionListener () {
public void actionperformed (ActionEvent e) {
Changeface (0,jcc.getcolor ());
}
};
public void init () {
Initialize layout.
Container CP = Getcontentpane ();
Cp.setlayout (New FlowLayout ());
Set menu bar.
Menus[0].add (Items[1]);
Items[1].addactionlistener (AL3);
Menus[1].add (Items[0]);
Items[0].addactionlistener (AL2);
JMenuBar MB = new JMenuBar ();
for (int i = 0; i < menus.length; i++)
Mb.add (Menus[i]);
Setjmenubar (MB);

Add 3 JTextField.
Cp.add (TXT1);
Cp.add (Label[0]);
Cp.add (TXT2);
Cp.add (label[1]);
Cp.add (TXT3);

Add 1 button with Joptionpane
Cp.add (B1);
B1.addactionlistener (AL);
}
void changeface (int i,object o) {
if (i==0) {
Set Background color
This.getcontentpane (). SetBackground ((Color) o);
SetBackground ((Color) o);
}
}
String bussiness (String op1,string op2) {
int result=0;
int op11=0;
int op21=0;
try{
Op11=integer.parseint (OP1);
}catch (Exception E1) {

}
try{
Op21=integer.parseint (OP2);
}catch (Exception E1) {

}
RESULT=OP11+OP21;
Return "" +result;
}
public static void Main (string[] args) {
JApplet applet = new Calculater ();
JFrame frame = new JFrame ("Calculator");
To close the application:
Console.setupclosing (frame);
Frame.getcontentpane (). Add (applet);
Frame.setsize (260,140);
Applet.init ();
Applet.start ();
Frame.setvisible (TRUE);
}
} ///:~