Make Simple Calculator in Java Swing


Make Simple Calculator in Java Swing:

https://youtu.be/5DLglCHUopE ________________________________________________ How to make simple calculator in Java Swing?

package Test;


import java.awt.event.*;

import javax.swing.*;

import java.awt.*;

class SimpleCalculator extends JFrame implements ActionListener {


static JFrame f;

static JTextField l;

String s0, s1, s2;

SimpleCalculator(){

s0 = s1 = s2 = "";

}

public static void main(String args[]){

f = new JFrame("calculator");

try {

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

}

catch (Exception e) {

System.err.println(e.getMessage());

}

SimpleCalculator c = new SimpleCalculator();

l = new JTextField(21);

l.setEditable(false);


JButton b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, ba, bs, bd, bm, be, beq, beq1;


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");


beq1 = new JButton("=");


ba = new JButton("+");

bs = new JButton("-");

bd = new JButton("/");

bm = new JButton("*");

beq = new JButton("C");


be = new JButton(".");


JPanel p = new JPanel();


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);


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);


p.setBackground(Color.white);


f.add(p);

f.setSize(200, 220);

f.show();

}

public void actionPerformed(ActionEvent e){

String s = e.getActionCommand();


if ((s.charAt(0) >= '0' && s.charAt(0) <= '9') || s.charAt(0) == '.') {

if (!s1.equals(""))

s2 = s2 + s;

else

s0 = s0 + s;

l.setText(s0 + s1 + s2);

}

else if (s.charAt(0) == 'C') {

s0 = s1 = s2 = "";

l.setText(s0 + s1 + s2);

}

else if (s.charAt(0) == '=') {

double te;


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));


l.setText(s0 + s1 + s2 + "=" + te);


s0 = Double.toString(te);

s1 = s2 = "";

}

else {

if (s1.equals("") || s2.equals(""))

s1 = s;


else {

double te;

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));

s0 = Double.toString(te);

s1 = s;

s2 = "";

}

l.setText(s0 + s1 + s2);

}

}

}


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