can somebody help me with switch statement.
import java.util.Stack;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.math.*;
import java.util.Vector;
public class Ahsan extends JFrame{
Stack s = new Stack();
private JFrame f;
private JPanel p1,p2;
private final int ADD = 1;
private final int SUBTRACT = 2; // declare class constants
private final int MULTIPLY = 3;
private int operation;
private JTextField jtfMain;
private JButton dot,zero,one,two,three,four,five,six,seven,eight,nine,minus,plus,multiply,divide,equal;
String value,A;
private dotButtonHandler dotHandler;
private zeroButtonHandler zeroHandler;
private oneButtonHandler oneHandler;
private twoButtonHandler twoHandler;
private threeButtonHandler threeHandler;
private fourButtonHandler fourHandler;
private fiveButtonHandler fiveHandler;
private sixButtonHandler sixHandler;
private sevenButtonHandler sevenHandler;
private eightButtonHandler eightHandler;
private nineButtonHandler nineHandler;
private minusButtonHandler minusHandler;
private plusButtonHandler plusHandler;
private multiplyButtonHandler multiplyHandler;
private divideButtonHandler divideHandler;
private equalButtonHandler equalHandler;
char ch;
Stack<String> cStack=new Stack<String>();
public Ahsan() {
setSize(400,190);
setTitle("Calculator");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
jtfMain = new JTextField("");
seven = new JButton("7");
sevenHandler=new sevenButtonHandler();
seven.addActionListener(sevenHandler);
eight = new JButton("8");
eightHandler=new eightButtonHandler();
eight.addActionListener(eightHandler);
nine=new JButton("9");
nineHandler=new nineButtonHandler();
nine.addActionListener(nineHandler);
zero=new JButton("0");
zeroHandler=new zeroButtonHandler();
zero.addActionListener(zeroHandler);
one=new JButton("1");
oneHandler=new oneButtonHandler();
one.addActionListener(oneHandler);
two=new JButton("2");
twoHandler=new twoButtonHandler();
two.addActionListener(twoHandler);
three=new JButton("3");
threeHandler=new threeButtonHandler();
three.addActionListener(threeHandler);
four=new JButton("4");
fourHandler=new fourButtonHandler();
four.addActionListener(fourHandler);
five=new JButton("5");
fiveHandler=new fiveButtonHandler();
five.addActionListener(fiveHandler);
six=new JButton("6");
sixHandler=new sixButtonHandler();
six.addActionListener(sixHandler);
minus=new JButton("-");
minusHandler=new minusButtonHandler();
minus.addActionListener(minusHandler);
plus=new JButton("+");
plusHandler=new plusButtonHandler();
plus.addActionListener(plusHandler);
multiply=new JButton("X");
multiplyHandler=new multiplyButtonHandler();
multiply.addActionListener(multiplyHandler);
divide=new JButton("/");
divideHandler=new divideButtonHandler();
divide.addActionListener(divideHandler);
equal= new JButton("=");
equalHandler = new equalButtonHandler();
equal.addActionListener(equalHandler);
dot=new JButton(".");
dotHandler=new dotButtonHandler();
dot.addActionListener(dotHandler);
p1 = new JPanel();
p1.setLayout(new GridLayout(1,1));
p2 = new JPanel();
p2.setLayout(new GridLayout(5,5));
p1.add(jtfMain);
p2.add(divide);
p2.add(seven);
p2.add(eight);
p2.add(nine);
p2.add(multiply);
p2.add(four);
p2.add(five);
p2.add(six);
p2.add(minus);
p2.add(one);
p2.add(two);
p2.add(three);
p2.add(plus);
p2.add(zero);
p2.add(dot);
p2.add(equal);
add(p1, BorderLayout.NORTH);
add(p2, BorderLayout.CENTER);
setVisible(true);
}
private class zeroButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
value = "0";
jtfMain.setText(jtfMain.getText()+value);
}
}
private class oneButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
value = "1";
jtfMain.setText(jtfMain.getText()+value);
}
}
private class twoButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
value = "2";
jtfMain.setText(jtfMain.getText()+value);
}
}
private class threeButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
value = "3";
jtfMain.setText(jtfMain.getText()+value);
}
}
private class fourButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
value = "4";
jtfMain.setText(jtfMain.getText()+value);
}
}
private class fiveButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
value = "5";
jtfMain.setText(jtfMain.getText()+value);
}
}
private class sixButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
value = "6";
jtfMain.setText(jtfMain.getText()+value);
}
}
private class sevenButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
value = "7";
jtfMain.setText(jtfMain.getText()+value);
}
}
private class eightButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
value= "8";
jtfMain.setText(jtfMain.getText()+value);
}
}
private class nineButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
value = "9";
jtfMain.setText(jtfMain.getText()+value);
}
}
private class dotButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
value+=".";
jtfMain.setText(jtfMain.getText()+value);
}
}
private class plusButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String plus = "+";
jtfMain.setText( jtfMain.getText()+plus);
}
}
private class minusButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String minus = "-";
jtfMain.setText( minus);
}
}
private class multiplyButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String times = "*";
jtfMain.setText(jtfMain.getText()+times);
}
}
private class divideButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String div= "/";
jtfMain.setText(jtfMain.getText()+div);
}
}
private class equalButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
int operation;
double x,z,a =0.0;
String y;
x = Double.parseDouble(jtfMain.getText());
y = jtfMain.getText();
z = Double.parseDouble(jtfMain.getText());
switch(this.operation)
{
case 1:
a = x + z;
break;
case 2:
a = x - z;
break;
case 3:
a = x * z;
break;
}
jtfMain.setText("= "+ a);
}
}
public static void main(String[] args)
{
Ahsan main = new Ahsan ();
{
}
}}[/INDENT]
