Calculator in Swing

Question

Hi all,
wanted a smal mangable code for simulating a calculator in swing.
Please provide me a link to the whereabouts of finding such a code.
Thanks in advance
Preets

Answer 1

import java.awt.*;
import java.lang.*;
import javax.swing.*;
public class Calculator extends JFrame {
JTextField text;
String sText1, sText2;
double dReg1, dReg2, dMem;
String sOperator;
boolean isFixReg;
public Calculator() {
initProperty();
Panel pFrame = new Panel();
pFrame.setLayout(new FlowLayout());
text = new JTextField("");
text.setHorizontalAlignment(JTextField.RIGHT);
text.setEditable(false);
text.setBackground(Color.white);
Panel pCalc = new Panel();
pCalc.setLayout(new BorderLayout(0, 10));
pCalc.add("North", text);
pFrame.add("Center", pCalc);
Panel pKey = new Panel();
pKey.setLayout(new GridLayout(5, 4, 5, 5));
getContentPane().add("Center", pKey);
pKey.add(new Button("C"));
pKey.add(new Button("MR"));
pKey.add(new Button("M-"));
pKey.add(new Button("M+"));
pKey.add(new Button("7"));
pKey.add(new Button("8"));
pKey.add(new Button("9"));
pKey.add(new Button("/"));
pKey.add(new Button("4"));
pKey.add(new Button("5"));
pKey.add(new Button("6"));
pKey.add(new Button("*"));
pKey.add(new Button("1"));
pKey.add(new Button("2"));
pKey.add(new Button("3"));
pKey.add(new Button("-"));
pKey.add(new Button("0"));
pKey.add(new Button("."));
pKey.add(new Button("="));
pKey.add(new Button("+"));
pCalc.add("South", pKey);
getContentPane().setLayout(new BorderLayout(0, 0));
getContentPane().add("Center", pFrame);
dReg1 = 0.0d;
dReg2 = 0.0d;
dMem = 0.0d;
sOperator = "";
text.setText("0");
isFixReg = true;
* property
private void initProperty() {
setSize(175, 215);
setLocation(50, 100);
setTitle("Calculator");
setVisible(true);
     public boolean action(Event evt, Object arg) {
          if ("C".equals(arg))
dReg1 = 0.0d;
dReg2 = 0.0d;
sOperator = "";
text.setText("0");
isFixReg = true;
else if (("0".equals(arg)) | ("1".equals(arg)) | ("2".equals(arg))
| ("3".equals(arg)) | ("4".equals(arg)) | ("5".equals(arg))
| ("6".equals(arg)) | ("7".equals(arg)) | ("8".equals(arg))
| ("9".equals(arg)) | (".".equals(arg)))
if (isFixReg)
sText2 = (String) arg;
else
sText2 = text.getText() + arg;
text.setText(sText2);
isFixReg = false;
else if (("+".equals(arg)) | ("-".equals(arg))
| ("*".equals(arg)) | ("/".equals(arg)) | ("=".equals(arg)))
sText1 = text.getText();
dReg2 = (Double.valueOf(sText1)).doubleValue();
dReg1 = Calculation(sOperator, dReg1, dReg2);
Double dTemp = new Double(dReg1);
sText2 = dTemp.toString();
text.setText(sText2);
sOperator = (String) arg;
isFixReg = true;
          else if ("MR".equals(arg))
Double dTemp = new Double(dMem);
sText2 = dTemp.toString();
text.setText(sText2);
sOperator = "";
isFixReg = true;
          else if ("M+".equals(arg))
sText1 = text.getText();
dReg2 = (Double.valueOf(sText1)).doubleValue();
dReg1 = Calculation(sOperator, dReg1, dReg2);
Double dTemp = new Double(dReg1);
sText2 = dTemp.toString();
text.setText(sText2);
dMem = dMem + dReg1;
sOperator = "";
isFixReg = true;
          else if ("M-".equals(arg))
sText1 = text.getText();
dReg2 = (Double.valueOf(sText1)).doubleValue();
dReg1 = Calculation(sOperator, dReg1, dReg2);
Double dTemp = new Double(dReg1);
sText2 = dTemp.toString();
text.setText(sText2);
dMem = dMem - dReg1;
sOperator = "";
isFixReg = true;
return true;
private double Calculation(String sOperator, double dReg1, double dReg2)
if ("+".equals(sOperator)) dReg1 = dReg1 + dReg2;
else if ("-".equals(sOperator)) dReg1 = dReg1 - dReg2;
else if ("*".equals(sOperator)) dReg1 = dReg1 * dReg2;
else if ("/".equals(sOperator)) dReg1 = dReg1 / dReg2;
else dReg1 = dReg2;
return dReg1;