// SwingCalculator.java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class SwingCalculator extends JFrame implements ActionListener{
    private JButton jbone,jbtwo,jbthree,jbfour,jbfive,jbsix,jbseven,jbeight,jbnine,jbzero,jbplus,jbminus,jbmul,jbdiv,jbequal,jbclear;
    private JPanel  panel;
    private JTextField jtfshow;
    public SwingCalculator(){
        jbone   = new JButton("1");
        jbtwo   = new JButton("2");
        jbthree = new JButton("3");
        jbfour  = new JButton("4");
        jbfive  = new JButton("5");
        jbsix   = new JButton("6");
        jbseven = new JButton("7");
        jbeight = new JButton("8");
        jbnine  = new JButton("9");
        jbzero  = new JButton("0");
        jbequal = new JButton("=");
        jbclear = new JButton("C");
        jbplus  = new JButton("+");
        jbminus = new JButton("-");
        jbmul   = new JButton("*");
        jbdiv   = new JButton("/");
        jtfshow = new JTextField(10);
        panel = new JPanel();
        panel.setLayout(new GridLayout(4,4));
        panel.add(jbseven);
        panel.add(jbeight);
        panel.add(jbnine);
        panel.add(jbplus);
        panel.add(jbfour);
        panel.add(jbfive);
        panel.add(jbsix);
        panel.add(jbminus);
        panel.add(jbone);
        panel.add(jbtwo);
        panel.add(jbthree);
        panel.add(jbmul);
        panel.add(jbclear);
        panel.add(jbzero);
        panel.add(jbequal);
        panel.add(jbdiv);
        jbclear.addActionListener(this);
        jbone.addActionListener(this);
        jbtwo.addActionListener(this);
        jbthree.addActionListener(this);
        jbfour.addActionListener(this);
        jbfive.addActionListener(this);
        jbsix.addActionListener(this);
        jbseven.addActionListener(this);
        jbeight.addActionListener(this);
        jbnine.addActionListener(this);
        jbzero.addActionListener(this);
        jbplus.addActionListener(this);
        jbmul.addActionListener(this);
        jbminus.addActionListener(this);
        jbdiv.addActionListener(this);
        jbequal.addActionListener(this);
        Container c = getContentPane();
        c.setLayout(new BorderLayout());
        c.add(jtfshow,BorderLayout.NORTH);
        c.add(panel,BorderLayout.CENTER);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(300,200);
        setTitle("Swing Calculator");
        setVisible(true);
    }
    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == jbone)
           jtfshow.setText(jtfshow.getText()+ "1");
        else if(e.getSource() == jbtwo)
           jtfshow.setText(jtfshow.getText()+ "2");
        else if(e.getSource() == jbthree)
           jtfshow.setText(jtfshow.getText()+ "3");
        else if(e.getSource() == jbfour)
           jtfshow.setText(jtfshow.getText()+ "4");
        else if(e.getSource() == jbfive)
           jtfshow.setText(jtfshow.getText()+ "5");
        else if(e.getSource() == jbsix)
           jtfshow.setText(jtfshow.getText()+ "6");
        else if(e.getSource() == jbseven)
           jtfshow.setText(jtfshow.getText()+ "7");
        else if(e.getSource() == jbeight)
           jtfshow.setText(jtfshow.getText()+ "8");
        else if(e.getSource() == jbnine)
           jtfshow.setText(jtfshow.getText()+ "9");
        else if(e.getSource() == jbzero)
           jtfshow.setText(jtfshow.getText()+ "0");
        else if(e.getSource() == jbplus)
           jtfshow.setText(jtfshow.getText()+ " + ");
        else if(e.getSource() == jbminus)
           jtfshow.setText(jtfshow.getText()+ " - ");
        else if(e.getSource() == jbmul)
           jtfshow.setText(jtfshow.getText()+ " * ");
        else if(e.getSource() == jbdiv)
           jtfshow.setText(jtfshow.getText()+ " / ");
        else if(e.getSource() == jbclear)
           jtfshow.setText(""); //
        else if(e.getSource() == jbequal){
           String[] sp;
           int result = 0,num1,num2;
           sp = jtfshow.getText().split(" ");

           num1 = Integer.parseInt(sp[0]);
           num2 = Integer.parseInt(sp[2]);
           if(sp[1].equals("+")){
            result = num1 + num2;
            jtfshow.setText(""+ result);
           }
           else if(sp[1].equals("-")){
            result = num1 - num2;
            jtfshow.setText(""+ result);
           }
           else if(sp[1].equals("*")){
            result = num1 * num2;
            jtfshow.setText(""+ result);
           }
           else if(sp[1].equals("/")){
            result = num1 / num2;
            jtfshow.setText(""+ result);
           }


           }
   }

}