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calculator.java
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// Java program to create a simple calculator
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
class calculator extends JFrame implements ActionListener {
// create a frame
static JFrame f;
// create a textfield
static JTextField l;
// store operator and operands
String s0, s1, s2;
// default constructor
calculator() {
s0 = s1 = s2 = "";
}
// main function
public static void main(String args[]) {
// create a frame
f = new JFrame("calculator");
try {
// set look and feel
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
System.err.println(e.getMessage());
}
// create a object of class
calculator c = new calculator();
// create a textfield
l = new JTextField(16);
// set the textfield to non editable
l.setEditable(false);
// create number buttons and some operators
JButton b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, ba, bs, bd, bm, be, beq, beq1;
// create number buttons
b0 = new JButton("0");
b1 = new JButton("1");
b2 = new JButton("2");
b3 = new JButton("3");
b4 = new JButton("4");
b5 = new JButton("5");
b6 = new JButton("6");
b7 = new JButton("7");
b8 = new JButton("8");
b9 = new JButton("9");
// equals button
beq1 = new JButton("=");
// create operator buttons
ba = new JButton("+");
bs = new JButton("-");
bd = new JButton("/");
bm = new JButton("*");
beq = new JButton("C");
// create . button
be = new JButton(".");
// create a panel
JPanel p = new JPanel();
// add action listeners
bm.addActionListener(c);
bd.addActionListener(c);
bs.addActionListener(c);
ba.addActionListener(c);
b9.addActionListener(c);
b8.addActionListener(c);
b7.addActionListener(c);
b6.addActionListener(c);
b5.addActionListener(c);
b4.addActionListener(c);
b3.addActionListener(c);
b2.addActionListener(c);
b1.addActionListener(c);
b0.addActionListener(c);
be.addActionListener(c);
beq.addActionListener(c);
beq1.addActionListener(c);
// add elements to panel
p.add(l);
p.add(ba);
p.add(b1);
p.add(b2);
p.add(b3);
p.add(bs);
p.add(b4);
p.add(b5);
p.add(b6);
p.add(bm);
p.add(b7);
p.add(b8);
p.add(b9);
p.add(bd);
p.add(be);
p.add(b0);
p.add(beq);
p.add(beq1);
// set Background of panel
p.setBackground(Color.red);
// add panel to frame
f.add(p);
f.setSize(200, 220);
f.show();
}
public void actionPerformed(ActionEvent e) {
String s = e.getActionCommand();
// if the value is a number
if ((s.charAt(0) >= '0' && s.charAt(0) <= '9') || s.charAt(0) == '.') {
// if operand is present then add to second no
if (!s1.equals(""))
s2 = s2 + s;
else
s0 = s0 + s;
// set the value of text
l.setText(s0 + s1 + s2);
} else if (s.charAt(0) == 'C') {
// clear the one letter
s0 = s1 = s2 = "";
// set the value of text
l.setText(s0 + s1 + s2);
} else if (s.charAt(0) == '=') {
double te;
// store the value in 1st
if (s1.equals("+"))
te = (Double.parseDouble(s0) + Double.parseDouble(s2));
else if (s1.equals("-"))
te = (Double.parseDouble(s0) - Double.parseDouble(s2));
else if (s1.equals("/"))
te = (Double.parseDouble(s0) / Double.parseDouble(s2));
else
te = (Double.parseDouble(s0) * Double.parseDouble(s2));
// set the value of text
l.setText(s0 + s1 + s2 + "=" + te);
// convert it to string
s0 = Double.toString(te);
s1 = s2 = "";
} else {
// if there was no operand
if (s1.equals("") || s2.equals(""))
s1 = s;
// else evaluate
else {
double te;
// store the value in 1st
if (s1.equals("+"))
te = (Double.parseDouble(s0) + Double.parseDouble(s2));
else if (s1.equals("-"))
te = (Double.parseDouble(s0) - Double.parseDouble(s2));
else if (s1.equals("/"))
te = (Double.parseDouble(s0) / Double.parseDouble(s2));
else
te = (Double.parseDouble(s0) * Double.parseDouble(s2));
// convert it to string
s0 = Double.toString(te);
// place the operator
s1 = s;
// make the operand blank
s2 = "";
}
// set the value of text
l.setText(s0 + s1 + s2);
}
}
}
// Java program to create a simple calculator
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
class calculator extends JFrame implements ActionListener {
// create a frame
static JFrame f;
// create a textfield
static JTextField l;
// store operator and operands
String s0, s1, s2;
// default constructor
calculator() {
s0 = s1 = s2 = "";
}
// main function
public static void main(String args[]) {
// create a frame
f = new JFrame("calculator");
try {
// set look and feel
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
System.err.println(e.getMessage());
}
// create a object of class
calculator c = new calculator();
// create a textfield
l = new JTextField(16);
// set the textfield to non editable
l.setEditable(false);
// create number buttons and some operators
JButton b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, ba, bs, bd, bm, be, beq, beq1;
// create number buttons
b0 = new JButton("0");
b1 = new JButton("1");
b2 = new JButton("2");
b3 = new JButton("3");
b4 = new JButton("4");
b5 = new JButton("5");
b6 = new JButton("6");
b7 = new JButton("7");
b8 = new JButton("8");
b9 = new JButton("9");
// equals button
beq1 = new JButton("=");
// create operator buttons
ba = new JButton("+");
bs = new JButton("-");
bd = new JButton("/");
bm = new JButton("*");
beq = new JButton("C");
// create . button
be = new JButton(".");
// create a panel
JPanel p = new JPanel();
// add action listeners
bm.addActionListener(c);
bd.addActionListener(c);
bs.addActionListener(c);
ba.addActionListener(c);
b9.addActionListener(c);
b8.addActionListener(c);
b7.addActionListener(c);
b6.addActionListener(c);
b5.addActionListener(c);
b4.addActionListener(c);
b3.addActionListener(c);
b2.addActionListener(c);
b1.addActionListener(c);
b0.addActionListener(c);
be.addActionListener(c);
beq.addActionListener(c);
beq1.addActionListener(c);
// add elements to panel
p.add(l);
p.add(ba);
p.add(b1);
p.add(b2);
p.add(b3);
p.add(bs);
p.add(b4);
p.add(b5);
p.add(b6);
p.add(bm);
p.add(b7);
p.add(b8);
p.add(b9);
p.add(bd);
p.add(be);
p.add(b0);
p.add(beq);
p.add(beq1);
// set Background of panel
p.setBackground(Color.red);
// add panel to frame
f.add(p);
f.setSize(200, 220);
f.show();
}
public void actionPerformed(ActionEvent e) {
String s = e.getActionCommand();
// if the value is a number
if ((s.charAt(0) >= '0' && s.charAt(0) <= '9') || s.charAt(0) == '.') {
// if operand is present then add to second no
if (!s1.equals(""))
s2 = s2 + s;
else
s0 = s0 + s;
// set the value of text
l.setText(s0 + s1 + s2);
} else if (s.charAt(0) == 'C') {
// clear the one letter
s0 = s1 = s2 = "";
// set the value of text
l.setText(s0 + s1 + s2);
} else if (s.charAt(0) == '=') {
double te;
// store the value in 1st
if (s1.equals("+"))
te = (Double.parseDouble(s0) + Double.parseDouble(s2));
else if (s1.equals("-"))
te = (Double.parseDouble(s0) - Double.parseDouble(s2));
else if (s1.equals("/"))
te = (Double.parseDouble(s0) / Double.parseDouble(s2));
else
te = (Double.parseDouble(s0) * Double.parseDouble(s2));
// set the value of text
l.setText(s0 + s1 + s2 + "=" + te);
// convert it to string
s0 = Double.toString(te);
s1 = s2 = "";
} else {
// if there was no operand
if (s1.equals("") || s2.equals(""))
s1 = s;
// else evaluate
else {
double te;
// store the value in 1st
if (s1.equals("+"))
te = (Double.parseDouble(s0) + Double.parseDouble(s2));
else if (s1.equals("-"))
te = (Double.parseDouble(s0) - Double.parseDouble(s2));
else if (s1.equals("/"))
te = (Double.parseDouble(s0) / Double.parseDouble(s2));
else
te = (Double.parseDouble(s0) * Double.parseDouble(s2));
// convert it to string
s0 = Double.toString(te);
// place the operator
s1 = s;
// make the operand blank
s2 = "";
}
// set the value of text
l.setText(s0 + s1 + s2);
}
}
}