Membuat Program Kalkulator menggunakan Java Eclipse

Hai selamat sobat, kali ini saya akan me repost postingan lama saudara saya (http://5302414021nining.blogspot.com)
Dipostingan kali ini saya membagi sedikit ilmu yang saya dapat, yaitu membuat Program Kalkulator sederhana menggunakan Java.
Langsung saja kita mulai yaa..

1. Pertama Buka Program Eclipse-nya.
2. Buat package baru dengan nama “Kalkulator” tanpa petik. Kemudian buat class-nya dengan nama “TugasKalkulator” tanpa petik juga yaa..
3. Setelah itu copy paste-kan code dibawah ini
   import java.awt.EventQueue;

   import javax.swing.JFrame;

   import javax.swing.JPanel;

   import javax.swing.border.EmptyBorder;

   import javax.swing.GroupLayout;

   import javax.swing.GroupLayout.Alignment;

   import javax.swing.JLabel;

   import java.awt.Font;

   import java.awt.Color;

   import javax.swing.JTextField;

   import javax.swing.LayoutStyle.ComponentPlacement;

   import javax.swing.JButton;

   import java.awt.event.MouseAdapter;

   import java.awt.event.MouseEvent;

   public class TugasKalkulator extends JFrame {

   // deklarasi variabel

   protected static final Object JButton = null;

   private JPanel contentPane;

   private JTextField textField;

   private Float operasi1;

   private Float operasi2;

   private String tanda;

   private String back;

   /**

   * Launch the application.

   */

   public static void main(String[] args) {

   EventQueue.invokeLater(new Runnable() {

   public void run() {

   try {

   TugasKalkulator frame = new TugasKalkulator();

   frame.setVisible(true);

   } catch (Exception e) {

   e.printStackTrace();

   }

   }

   });

   }

   /**

   * Create the frame.

   */

   public TugasKalkulator() {

   // sintax untuk pembuatan frame

   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

   setBounds(100, 50, 450, 300);

   contentPane = new JPanel();

   contentPane.setBackground(new Color(33, 33, 50));

   contentPane.setBorder(new EmptyBorder(5, 5, 5, 13));

   setContentPane(contentPane);

   //label judul untuk tulisan Nining S <<>>

   JLabel NiningKalkulator = new JLabel(“Nining S”);

   NiningKalkulator.setForeground(Color.white);

   NiningKalkulator.setFont(new Font(“Tempus Sans ITC”, Font.BOLD, 28));

   // label untuk tulisan hasil

   JLabel lblHasil = new JLabel(“Nilai”);

   lblHasil.setForeground(Color.white);

   lblHasil.setFont(new Font(“Tahoma”, Font.BOLD, 13));

   // display hasil dan operasi kalkulator

   textField = new JTextField();

   textField.setBackground(Color.white);

   textField.setFont(new Font(“Tahoma”, Font.BOLD, 17));

   textField.setColumns(10);

   // Syntax untuk menampilkan angka (0-9)

   JButton satu = new JButton(“1”);

   satu.addMouseListener(new MouseAdapter() {

   @Override

   // syntax untuk menjalankan aksi,jika button angka di klik maka akan tampil di layer display angka tersebut

   public void mouseClicked(MouseEvent arg0) {

   textField.setText(textField.getText()+”1″);

   }

   });

   satu.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   JButton dua = new JButton(“2”);

   dua.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   textField.setText(textField.getText()+”2″);

   }

   });

   dua.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   JButton tiga = new JButton(“3”);

   tiga.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   textField.setText(textField.getText()+”3″);

   }

   });

   tiga.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   JButton empat = new JButton(“4”);

   empat.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   textField.setText(textField.getText()+”4″);

   }

   });

   empat.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   JButton lima = new JButton(“5”);

   lima.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   textField.setText(textField.getText()+”5″);

   }

   });

   lima.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   JButton enam = new JButton(“6”);

   enam.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   textField.setText(textField.getText()+”6″);

   }

   });

   enam.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   JButton tujuh = new JButton(“7”);

   tujuh.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   textField.setText(textField.getText()+”7″);

   }

   });

   tujuh.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   JButton delapan = new JButton(“8”);

   delapan.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   textField.setText(textField.getText()+”8″);

   }

   });

   delapan.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   JButton sembilan = new JButton(“9”);

   sembilan.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   textField.setText(textField.getText()+”9″);

   }

   });

   sembilan.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   JButton nol = new JButton(“0”);

   nol.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   textField.setText(textField.getText()+”0″);

   }

   });

   nol.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   // syntax untuk button operasi matematika(+,_,/,* dan =) dan juga tombol backspace dan clean

   JButton perkalian = new JButton(“x”);

   perkalian.addMouseListener(new MouseAdapter() {

   // syntax untuk menjalankan fungsi dari tombol yaitu operasi matematika pada kalkulator dan kemudian di tampilkan pada display

   @Override

   public void mouseClicked(MouseEvent arg0) {

   operasi1=Float.valueOf(textField.getText());

   tanda=”*”;

   textField.setText(“”);

   }

   });

   perkalian.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   JButton pembagian = new JButton(“/”);

   pembagian.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   operasi1=Float.valueOf(textField.getText());

   tanda=”/”;

   textField.setText(“”);

   }

   });

   pembagian.setFont(new Font(“Tahoma”, Font.PLAIN, 11));

   JButton penjumlahan = new JButton(“+”);

   penjumlahan.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   operasi1=Float.valueOf(textField.getText());

   tanda=”+”;

   textField.setText(“”);

   }

   });

   penjumlahan.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   JButton pengurangan = new JButton(“-“);

   pengurangan.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   operasi1=Float.valueOf(textField.getText());

   tanda=”-“;

   textField.setText(“”);

   }

   });

   pengurangan.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   // syntax sama dengan

   JButton samadengan = new JButton(“=”);

   samadengan.addMouseListener(new MouseAdapter() {

   @Override

   //syntax untuk operasi samadengan dan di tampilkan pada display kalkulator (textfield)

   public void mouseClicked(MouseEvent arg0) {

   operasi2=Float.valueOf(textField.getText());

   if(tanda.equals(“*”))

   operasi1=operasi1*operasi2;

   else if(tanda.equals(“/”))

   operasi1=operasi1/operasi2;

   else if(tanda.equals(“+”))

   operasi1=operasi1+operasi2;

   else if(tanda.equals(“-“))

   operasi1=operasi1-operasi2;

   textField.setText(String.valueOf(operasi1));

   }

   });

   samadengan.setFont(new Font(“Tahoma”, Font.BOLD, 11));

   // syntax untuk backspace, menghapus angka per satu digit

   JButton btnBa = new JButton(”  < Hapus  “);

   btnBa.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   int x;

   back=textField.getText();

   x=back.length();

   back=back.substring(0,x-1);

   textField.setText(back);

   }

   });

   btnBa.setFont(new Font(“Tahoma”, Font.BOLD, 9));

   // syntax untuk menghapus angka yang telah di tekan secara keseluruah (clear)

   JButton btnC = new JButton(“C”);

   btnC.addMouseListener(new MouseAdapter() {

   @Override

   public void mouseClicked(MouseEvent arg0) {

   textField.setText(“”);

   }

   });

   btnC.setFont(new Font(“Tahoma”, Font.BOLD, 10));

   // syntax untuk menampilankan tulisan http://www.5302414021nining.com

   JLabel lblTmd = new JLabel(“www.5302414021nining.blogspot.com”);

   lblTmd.setForeground(Color.white);

   lblTmd.setFont(new Font(“Simplified Arabic Fixed”, Font.BOLD, 12));

   GroupLayout gl_contentPane = new GroupLayout(contentPane);

   gl_contentPane.setHorizontalGroup(

   gl_contentPane.createParallelGroup(Alignment.LEADING)

   .addGroup(gl_contentPane.createSequentialGroup()

   .addContainerGap()

   .addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)

   .addComponent(lblHasil)

   .addComponent(textField, GroupLayout.DEFAULT_SIZE, 414, Short.MAX_VALUE)

   .addGroup(gl_contentPane.createSequentialGroup()

   .addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)

   .addGroup(gl_contentPane.createSequentialGroup()

   .addComponent(satu)

   .addPreferredGap(ComponentPlacement.RELATED)

   .addComponent(dua)

   .addPreferredGap(ComponentPlacement.RELATED)

   .addComponent(tiga))

   .addGroup(gl_contentPane.createSequentialGroup()

   .addComponent(empat)

   .addPreferredGap(ComponentPlacement.RELATED)

   .addComponent(lima)

   .addPreferredGap(ComponentPlacement.RELATED)

   .addComponent(enam))

   .addGroup(gl_contentPane.createSequentialGroup()

   .addComponent(tujuh)

   .addPreferredGap(ComponentPlacement.RELATED)

   .addComponent(delapan)

   .addPreferredGap(ComponentPlacement.RELATED)

   .addComponent(sembilan))

   .addGroup(gl_contentPane.createSequentialGroup()

   .addComponent(nol)

   .addPreferredGap(ComponentPlacement.RELATED)

   .addComponent(btnBa)))

   .addGap(23)

   .addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING, false)

   .addGroup(gl_contentPane.createSequentialGroup()

   .addGap(2)

   .addComponent(perkalian)

   .addPreferredGap(ComponentPlacement.UNRELATED)

   .addComponent(pengurangan, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

   .addGroup(gl_contentPane.createSequentialGroup()

   .addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)

   .addComponent(penjumlahan)

   .addGroup(gl_contentPane.createSequentialGroup()

   .addGap(2)

   .addComponent(pembagian, GroupLayout.PREFERRED_SIZE, 39, GroupLayout.PREFERRED_SIZE))

   .addComponent(btnC))

   .addPreferredGap(ComponentPlacement.UNRELATED)

   .addComponent(samadengan)))

   .addContainerGap(169, Short.MAX_VALUE))))

   .addGroup(gl_contentPane.createSequentialGroup()

   .addGap(114)

   .addComponent(NiningKalkulator, GroupLayout.PREFERRED_SIZE, 191, GroupLayout.PREFERRED_SIZE)

   .addContainerGap(119, Short.MAX_VALUE))

   .addGroup(Alignment.TRAILING, gl_contentPane.createSequentialGroup()

   .addContainerGap(274, Short.MAX_VALUE)

   .addComponent(lblTmd)

   .addGap(22))

   );

   gl_contentPane.setVerticalGroup(

   gl_contentPane.createParallelGroup(Alignment.LEADING)

   .addGroup(gl_contentPane.createSequentialGroup()

   .addComponent(NiningKalkulator)

   .addPreferredGap(ComponentPlacement.RELATED)

   .addComponent(lblHasil)

   .addGap(10)

   .addComponent(textField, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)

   .addGap(23)

   .addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)

   .addComponent(satu)

   .addComponent(dua)

   .addComponent(tiga)

   .addComponent(perkalian)

   .addComponent(pengurangan))

   .addPreferredGap(ComponentPlacement.RELATED)

   .addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING, false)

   .addGroup(gl_contentPane.createSequentialGroup()

   .addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)

   .addComponent(empat)

   .addComponent(lima)

   .addComponent(enam)

   .addComponent(pembagian, GroupLayout.PREFERRED_SIZE, 23, GroupLayout.PREFERRED_SIZE))

   .addPreferredGap(ComponentPlacement.RELATED)

   .addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)

   .addComponent(tujuh)

   .addComponent(delapan)

   .addComponent(sembilan)

   .addComponent(penjumlahan))

   .addPreferredGap(ComponentPlacement.RELATED)

   .addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)

   .addComponent(nol)

   .addComponent(btnBa)

   .addComponent(btnC)))

   .addComponent(samadengan, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

   .addPreferredGap(ComponentPlacement.RELATED, 13, Short.MAX_VALUE)

   .addComponent(lblTmd))

   );

   contentPane.setLayout(gl_contentPane);

   }

   }
4. Kemudian Klik Run, akan muncul hasil seperti berikut :

Selamat mencoba,. untuk inovasi kalian
Code dapat di rubah kok sesuai dengan kebutuhan, semoga bermanfaat