Notes

import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

import com.sun.javafx.geom.AreaOp.AddOp;

import sun.tools.jar.resources.jar;

public class Calculator extends JFrame {

enum OperationEnum {

ADDITION("+"), SUBSTRACTION("-"), DIVISION("/"), MULTIPICATION("*");
String operator;

OperationEnum(String s1) {
operator = s1;
}


@Override
public String toString() {

return operator;
}
}

JButton b1, b2, b3, b4, b5, b6, b7, b8, b9, b10,b11,b12,b13,b14,b15,b16,b17;
JTextField t1;
JPanel p1;

public Calculator() {

t1 = new JTextField(10);
JButton b1 = new JButton("1");
JButton b2 = new JButton("2");
JButton b3 = new JButton("3");
JButton b4 = new JButton("4");
JButton b5 = new JButton("5");
JButton b6 = new JButton("6");
JButton b7 = new JButton("7");
JButton b8 = new JButton("8");
JButton b9 = new JButton("9");
JButton b10 = new JButton("0");
JButton b11 = new JButton(OperationEnum.ADDITION.toString());
JButton b12 = new JButton(OperationEnum.SUBSTRACTION.toString());
JButton b13 = new JButton(OperationEnum.DIVISION.toString());
JButton b14 = new JButton(OperationEnum.MULTIPICATION.toString());
JButton b15 = new JButton("=");
JButton b16= new JButton("M+");
JButton b17= new JButton("M-");


add(t1);
JPanel p1 = new JPanel(new GridLayout(6, 6));
setLayout(new FlowLayout());

p1.add(b1);
p1.add(b2);
p1.add(b3);
p1.add(b4);
p1.add(b5);
p1.add(b6);
p1.add(b7);
p1.add(b8);
p1.add(b9);
p1.add(b10);
p1.add(b11);
p1.add(b12);
p1.add(b13);
p1.add(b14);
p1.add(b15);
p1.add(b16);
p1.add(b17);
add(p1);

setSize(300, 300);

Operation o = new Operation();

b1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
t1.setText(t1.getText()+"1");

}
});

b2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
t1.setText(t1.getText()+"2");

}
});

b3.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
t1.setText(t1.getText()+"3");

}
});
b4.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
t1.setText(t1.getText()+"4");

}
});

b5.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
t1.setText(t1.getText()+"5");

}
});


b6.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
t1.setText(t1.getText()+"6");

}
});

b7.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
t1.setText(t1.getText()+"7");

}
});


b8.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
t1.setText(t1.getText()+"8");

}
});


b9.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
t1.setText(t1.getText()+"9");

}
});

b10.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
t1.setText(t1.getText()+"0");

}
});

b11.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (o.op==null) {
o.n1 =Double.parseDouble(t1.getText());
o.op = "+";
}
else {
o.n2 =Double.parseDouble(t1.getText());
}
System.out.println(o);
t1.setText("");
//t1.setText(t1.getText()+b11.getText());


}});

b12.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (o.op==null) {
o.n1 =Double.parseDouble(t1.getText());
o.op = "-";
}
else {
o.n2 =Double.parseDouble(t1.getText());

}
t1.setText(t1.getText()+b12.getText());

}});


b13.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (o.op==null) {
o.n1 =Double.parseDouble(t1.getText());
o.op = "/";
}
else {
o.n2 =Double.parseDouble(t1.getText());
}
t1.setText(t1.getText()+b12.getText());



t1.setText(t1.getText()+b13.getText());

}});

b14.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (o.op==null) {
o.n1 =Double.parseDouble(t1.getText());
o.op = "*";
}
else {
o.n2 =Double.parseDouble(t1.getText());
}



t1.setText(t1.getText()+b14.getText());

}});

b15.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {

if(o.n1!=0 && o.n2!=0) {
o.op = "=";

}
}});
setVisible(true);

b16.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {

try {
FileWriter fw= new FileWriter("E:\calculator.txt");

//fw.write();

fw.flush();


} catch (IOException e1) {

e1.printStackTrace();
}

}
});


b17.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {


try {
Reader r = new FileReader("E:\testout.txt");






} catch (FileNotFoundException e1) {

e1.printStackTrace();
}




}
});



}

public static void main(String[] args) {

new Calculator();
}

}