import javax.swing.
*;
import java.awt.*;
import java.awt.event.*;
public class Main
{
public static void main(String[] args)
{
new Calculator();
}
}
class Calculator implements ActionListener
{
JFrame frame;
JTextField textfield;
JButton[] numberButtons = new JButton[10];
JButton[] functionButtons = new JButton[9];
JButton addButton,subButton,mulButton,divButton;
JButton decButton, equButton, delButton, clrButton, negButton;
JPanel panel;
Font myFont = new Font("Arial",Font.BOLD,30);
double num1=0,num2=0,result=0;
char operator;
Calculator()
{
frame = new JFrame("Calculator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(420, 550);
frame.setLayout(null);
textfield = new JTextField();
textfield.setBounds(50, 25, 300, 50);
textfield.setFont(myFont);
textfield.setEditable(false);
addButton = new JButton("+");
subButton = new JButton("-");
mulButton = new JButton("*");
divButton = new JButton("/");
decButton = new JButton(".");
equButton = new JButton("=");
delButton = new JButton("Del");
clrButton = new JButton("Clr");
negButton = new JButton("(-)");
functionButtons[0] = addButton;
functionButtons[1] = subButton;
functionButtons[2] = mulButton;
functionButtons[3] = divButton;
functionButtons[4] = decButton;
functionButtons[5] = equButton;
functionButtons[6] = delButton;
functionButtons[7] = clrButton;
functionButtons[8] = negButton;
for(int i =0;i<9;i++)
{
functionButtons[i].addActionListener(this);
functionButtons[i].setFont(myFont);
functionButtons[i].setFocusable(false);
}
for(int i =0;i<10;i++)
{
numberButtons[i] = new JButton(String.valueOf(i));
numberButtons[i].addActionListener(this);
numberButtons[i].setFont(myFont);
numberButtons[i].setFocusable(false);
}
negButton.setBounds(50,430,100,50);
delButton.setBounds(150,430,100,50);
clrButton.setBounds(250,430,100,50);
panel = new JPanel();
panel.setBounds(50, 100, 300, 300);
panel.setLayout(new GridLayout(4,4,10,10));
panel.add(numberButtons[1]);
panel.add(numberButtons[2]);
panel.add(numberButtons[3]);
panel.add(addButton);
panel.add(numberButtons[4]);
panel.add(numberButtons[5]);
panel.add(numberButtons[6]);
panel.add(subButton);
panel.add(numberButtons[7]);
panel.add(numberButtons[8]);
panel.add(numberButtons[9]);
panel.add(mulButton);
panel.add(decButton);
panel.add(numberButtons[0]);
panel.add(equButton);
panel.add(divButton);
frame.add(panel);
frame.add(negButton);
frame.add(delButton);
frame.add(clrButton);
frame.add(textfield);
frame.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e)
{
for(int i=0;i<10;i++)
{
if(e.getSource() == numberButtons[i])
{
textfield.setText(textfield.getText().concat(String.valueOf(i)));
}
}
if(e.getSource()==decButton)
{
textfield.setText(textfield.getText().concat("."));
}
if(e.getSource()==addButton)
{
num1 = Double.parseDouble(textfield.getText());
operator ='+';
textfield.setText("");
}
if(e.getSource()==subButton)
{
num1 = Double.parseDouble(textfield.getText());
operator ='-';
textfield.setText("");
}
if(e.getSource()==mulButton)
{
num1 = Double.parseDouble(textfield.getText());
operator ='*';
textfield.setText("");
}
if(e.getSource()==divButton)
{
num1 = Double.parseDouble(textfield.getText());
operator ='/';
textfield.setText("");
}
if(e.getSource()==equButton)
{
num2=Double.parseDouble(textfield.getText());
switch(operator)
{
case'+':
result=num1+num2;
break;
case'-':
result=num1-num2;
break;
case'*':
result=num1*num2;
break;
case'/':
result=num1/num2;
break;
}
textfield.setText(String.valueOf(result));
num1=result;
}
if(e.getSource()==clrButton)
{
textfield.setText("");
}
if(e.getSource()==delButton)
{
String string = textfield.getText();
textfield.setText("");
for(int i=0;i<string.length()-1;i++)
{
textfield.setText(textfield.getText()+string.charAt(i));
}
}
if(e.getSource()==negButton)
{
double temp = Double.parseDouble(textfield.getText());
temp*=-1;
textfield.setText(String.valueOf(temp));
}
}
}
Output:
