Contoh Source Code Program Kalkulator Sederhana Menggunakan Java

 
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class AplikasiKalkulator extends JFrame implements ActionListener
{
 private Container container = new Container();
 JPanel panel1= new JPanel();
 JPanel panel2= new JPanel();
 JPanel panel3= new JPanel();
 private JLabel label1 = new JLabel("Input A = ");
 private JLabel label2 = new JLabel("Input B = ");
 private TextField txt1=new TextField(20);
 private TextField txt2=new TextField(20);
 private JButton cmd1= new JButton ("-");
 private JButton cmd2= new JButton ("+");
 private JButton cmd3= new JButton ("/");
 private JButton cmd4= new JButton ("*");
 private JButton cmd5=new JButton("Exit");
 private JTextArea txtarea1=new JTextArea(7,20);
 String Hasil="";
 AplikasiKalkulator()
  {
  setTitle("Kalkulator");
  setLocation(300,100);
  setSize(300,210);
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  
  panel1.setLayout(new GridLayout(2,2));
  panel1.add(label1);
  panel1.add(txt1);
  panel1.add(label2);
  panel1.add(txt2);
  panel2.setLayout(new GridLayout(5,1));
  panel2.add(cmd1);
  panel2.add(cmd2);
  panel2.add(cmd3);
  panel2.add(cmd4);
  panel2.add(cmd5);
  panel3.add(txtarea1);

  container = getContentPane();
  container.setLayout(new BorderLayout());
  container.add (panel1, BorderLayout.NORTH);
  container.add(panel2,BorderLayout.EAST);
  container.add(panel3,BorderLayout.WEST);
  cmd1.addActionListener(this);
  cmd2.addActionListener(this);
  cmd3.addActionListener(this);
  cmd4.addActionListener(this);
  cmd5.addActionListener(this);
  setVisible(true);
  }
  public void actionPerformed (ActionEvent e)
  {
  Object objek = e.getSource();
          if (objek == cmd1)
           {
   double x= Double.parseDouble(txt1.getText());
   double y= Double.parseDouble(txt2.getText());
   String z= String.valueOf(x-y);
   txtarea1.append(txt1.getText()+" dikurangi "+txt2.getText()+" = "+z+"\n");
           }
  else
  if (objek == cmd2)
           {
   double x= Double.parseDouble(txt1.getText());
   double y= Double.parseDouble(txt2.getText());
   String z= String.valueOf(x+y);
   txtarea1.append(txt1.getText()+" ditambah "+txt2.getText()+" = "+z+"\n");
           }
  else
  if (objek == cmd3)
           {
   double x= Double.parseDouble(txt1.getText());
   double y= Double.parseDouble(txt2.getText());
   String z= String.valueOf(x/y);
   txtarea1.append(txt1.getText()+" dibagi "+txt2.getText()+" = "+z+"\n");
           }
  else
  if (objek == cmd4)
           {
   double x= Double.parseDouble(txt1.getText());
   double y= Double.parseDouble(txt2.getText());
   String z= String.valueOf(x*y);
   txtarea1.append(txt1.getText()+" dikali "+txt2.getText()+" = "+z+"\n");
           }
  else
  if (objek == cmd5)
           {
   System.exit(0);
           }
 }
  public static void main(String args[])
   {
   new AplikasiKalkulator();
   }
}

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Penulis :

Lefi Andri