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BCA Tuition > Learn Java Programming > How to design a calculator which performs arithmetic...
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How to design a calculator which performs arithmetic operations using swings?

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Use Swing Designer to design front end for the calculator. After that, apply logic for arithmetic operations using the action performed method on every operator.
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import javax.swing.*; import java.awt.event.*; class Calc implements ActionListener { JFramef; JTextFieldt; JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b0,bdiv,bmul,bsub,badd,bdec,beq,bdel,bclr; staticdoublea=0,b=0,result=0; staticintoperator=0; Calc() { f=newJFrame("Calculator"); t=newJTextField(); b1=newJButton("1"); b2=newJButton("2"); b3=newJButton("3"); b4=newJButton("4"); b5=newJButton("5"); b6=newJButton("6"); b7=newJButton("7"); b8=newJButton("8"); b9=newJButton("9"); b0=newJButton("0"); bdiv=newJButton("/"); bmul=newJButton("*"); bsub=newJButton("-"); badd=newJButton("+"); bdec=newJButton("."); beq=newJButton("="); bdel=newJButton("Delete"); bclr=newJButton("Clear"); ...
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import javax.swing.*;
import java.awt.event.*;
 
 
class Calc implements ActionListener
{
JFramef;
JTextFieldt;
JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b0,bdiv,bmul,bsub,badd,bdec,beq,bdel,bclr;
 
staticdoublea=0,b=0,result=0;
staticintoperator=0;
 
Calc()
{
f=newJFrame("Calculator");
t=newJTextField();
b1=newJButton("1");
b2=newJButton("2");
b3=newJButton("3");
b4=newJButton("4");
b5=newJButton("5");
b6=newJButton("6");
b7=newJButton("7");
b8=newJButton("8");
b9=newJButton("9");
b0=newJButton("0");
bdiv=newJButton("/");
bmul=newJButton("*");
bsub=newJButton("-");
badd=newJButton("+");
bdec=newJButton(".");
beq=newJButton("=");
bdel=newJButton("Delete");
bclr=newJButton("Clear");
 
t.setBounds(30,40,280,30);
b7.setBounds(40,100,50,40);
b8.setBounds(110,100,50,40);
b9.setBounds(180,100,50,40);
bdiv.setBounds(250,100,50,40);
 
b4.setBounds(40,170,50,40);
b5.setBounds(110,170,50,40);
b6.setBounds(180,170,50,40);
bmul.setBounds(250,170,50,40);
 
b1.setBounds(40,240,50,40);
b2.setBounds(110,240,50,40);
b3.setBounds(180,240,50,40);
bsub.setBounds(250,240,50,40);
 
bdec.setBounds(40,310,50,40);
b0.setBounds(110,310,50,40);
beq.setBounds(180,310,50,40);
badd.setBounds(250,310,50,40);
 
bdel.setBounds(60,380,100,40);
bclr.setBounds(180,380,100,40);
 
f.add(t);
f.add(b7);
f.add(b8);
f.add(b9);
f.add(bdiv);
f.add(b4);
f.add(b5);
f.add(b6);
f.add(bmul);
f.add(b1);
f.add(b2);
f.add(b3);
f.add(bsub);
f.add(bdec);
f.add(b0);
f.add(beq);
f.add(badd);
f.add(bdel);
f.add(bclr);
 
f.setLayout(null);
f.setVisible(true);
f.setSize(350,500);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setResizable(false);
 
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
b5.addActionListener(this);
b6.addActionListener(this);
b7.addActionListener(this);
b8.addActionListener(this);
b9.addActionListener(this);
b0.addActionListener(this);
badd.addActionListener(this);
bdiv.addActionListener(this);
bmul.addActionListener(this);
bsub.addActionListener(this);
bdec.addActionListener(this);
beq.addActionListener(this);
bdel.addActionListener(this);
bclr.addActionListener(this);
}
 
publicvoidactionPerformed(ActionEvente)
{
if(e.getSource()==b1)
t.setText(t.getText().concat("1"));
 
if(e.getSource()==b2)
t.setText(t.getText().concat("2"));
 
if(e.getSource()==b3)
t.setText(t.getText().concat("3"));
 
if(e.getSource()==b4)
t.setText(t.getText().concat("4"));
 
if(e.getSource()==b5)
t.setText(t.getText().concat("5"));
 
if(e.getSource()==b6)
t.setText(t.getText().concat("6"));
 
if(e.getSource()==b7)
t.setText(t.getText().concat("7"));
 
if(e.getSource()==b8)
t.setText(t.getText().concat("8"));
 
if(e.getSource()==b9)
t.setText(t.getText().concat("9"));
 
if(e.getSource()==b0)
t.setText(t.getText().concat("0"));
 
if(e.getSource()==bdec)
t.setText(t.getText().concat("."));
 
if(e.getSource()==badd)
{
a=Double.parseDouble(t.getText());
operator=1;
t.setText("");
}
 
if(e.getSource()==bsub)
{
a=Double.parseDouble(t.getText());
operator=2;
t.setText("");
}
 
if(e.getSource()==bmul)
{
a=Double.parseDouble(t.getText());
operator=3;
t.setText("");
}
 
if(e.getSource()==bdiv)
{
a=Double.parseDouble(t.getText());
operator=4;
t.setText("");
}
 
if(e.getSource()==beq)
{
b=Double.parseDouble(t.getText());
 
switch(operator)
{
case1:result=a+b;
break;
 
case2:result=a-b;
break;
 
case3:result=a*b;
break;
 
case4:result=a/b;
break;
 
default:result=0;
}
 
t.setText(""+result);
}
 
if(e.getSource()==bclr)
t.setText("");
 
if(e.getSource()==bdel)
{
Strings=t.getText();
t.setText("");
for(inti=0;i<s.length()-1;i++)
t.setText(t.getText()+s.charAt(i));
}
}
 
publicstaticvoidmain(String...s)
{
newCalc();
}
}
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physics Trainer with 4+ years of experience at home tutor

// Java program to create a simple calculator // with basic +, -, /, * using java swing elements 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...
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// Java program to create a simple calculator
// with basic +, -, /, * using java swing elements
  
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 oprerator and operands
    String s0, s1, s2;
  
    // default constrcutor
    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.blue);
  
        // 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);
        }
    }
}
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