Membuat Form Untuk Input Identitas

1. Untuk membuat sebuah form, pertama-tama buatlah design form seperti gambar berikut:
   
2. Kemudian input kode berikut untuk setiap object:
    package Form;

import java.awt.Color;
import javax.swing.JOptionPane;


/**
 *
 * @author Natan
 */
public class PhoneBook extends javax.swing.JFrame {

    /** Creates new form PhoneBook */
    public PhoneBook() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        txtnama = new javax.swing.JTextField();
        txtalamat = new javax.swing.JTextField();
        txttlp = new javax.swing.JTextField();
        btnsimpan = new javax.swing.JButton();
        btnbatal = new javax.swing.JButton();
        jLabel4 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        txtarea = new javax.swing.JTextArea();
        btnubah = new javax.swing.JButton();
        btnhapus = new javax.swing.JButton();
        btnkeluar = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder("Input Identitas"));

        jLabel1.setText("Nama");

        jLabel2.setText("Alamat");

        jLabel3.setText("Telepon");

        btnsimpan.setText("Simpan");
        btnsimpan.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnsimpanActionPerformed(evt);
            }
        });

        btnbatal.setText("Batal");
        btnbatal.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnbatalActionPerformed(evt);
            }
        });

      

        jLabel4.setText("Nama           Alamat          Telepon");

        txtarea.setColumns(20);
        txtarea.setRows(5);
        jScrollPane1.setViewportView(txtarea);

        btnubah.setText("Ubah");
        btnubah.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnubahActionPerformed(evt);
            }
        });

        btnhapus.setText("Hapus");
        btnhapus.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnhapusActionPerformed(evt);
            }
        });

        btnkeluar.setText("Keluar");
        btnkeluar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnkeluarActionPerformed(evt);
            }
        });


        pack();
    }// </editor-fold>

    private void btnkeluarActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        JOptionPane.showMessageDialog(rootPane, "Terima Kasih, Sampai jumpa...", "Pesan System", WIDTH);
        System.exit(WIDTH);
    }

    private void btnhapusActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        String niel=txtarea.getText();
        if (niel.isEmpty()){JOptionPane.showMessageDialog(rootPane, "List Kosong Atau Anda belum memilih TEKS..", "Pesan System", WIDTH);}
        else{txtarea.cut();}
    }

    private void btnbatalActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
         txtnama.setText("");
        txtalamat.setText("");
        txttlp.setText("");
        txtnama.requestFocus();
    }

    private void btnubahActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
         String dani=txtarea.getText();
        if (dani.isEmpty()){JOptionPane.showMessageDialog(rootPane, "List Kosong...!", "Pesan System", WIDTH);}
        else {
            txtarea.isEditable();
            txtarea.requestFocus();}
    }

    private void btnsimpanActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        String aku="",natan="";
        aku=txtnama.getText();
        natan=txtalamat.getText();
        if (aku.isEmpty()&&natan.isEmpty()){
                JOptionPane.showMessageDialog(rootPane, "Anda Belum mengisi Nama atau Alamat...", "Pesan System", WIDTH);}
        else {
                txtarea.append(txtnama.getText()+" -- "+txtalamat.getText()+" -- "+txttlp.getText()+"\n");}
        btnbatalActionPerformed(null);
    }
private void intComponents() {

        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        txtnama = new javax.swing.JTextField();
        txtalamat = new javax.swing.JTextField();
        txttlp = new javax.swing.JTextField();
        btnsimpan = new javax.swing.JButton();
        btnbatal = new javax.swing.JButton();
        btnubah = new javax.swing.JButton();
        btnhapus = new javax.swing.JButton();
        btnkeluar = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        txtarea = new javax.swing.JTextArea();
        jLabel4 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Simple Phone Book");
        setAlwaysOnTop(true);
        setName("frame"); // NOI18N
        setResizable(false);

        jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder("Input Identitas"));

        jLabel1.setText("Nama");

        jLabel2.setText("Alamat");

        jLabel3.setText("Telepon");

        txtnama.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                txtnamaActionPerformed(evt);
            }
        });
        txtnama.addFocusListener(new java.awt.event.FocusAdapter() {
            @Override
            public void focusGained(java.awt.event.FocusEvent evt) {
                txtnamaFocusGained(evt);
            }
            @Override
            public void focusLost(java.awt.event.FocusEvent evt) {
                txtnamaFocusLost(evt);
            }
        });
        txtnama.addKeyListener(new java.awt.event.KeyAdapter() {
            @Override
            public void keyPressed(java.awt.event.KeyEvent evt) {
                loncat(evt);
            }
            @Override
            public void keyReleased(java.awt.event.KeyEvent evt) {
                txtnamaKeyReleased(evt);
            }
        });

        txtalamat.addFocusListener(new java.awt.event.FocusAdapter() {
            @Override
            public void focusGained(java.awt.event.FocusEvent evt) {
                txtalamatFocusGained(evt);
            }
            @Override
            public void focusLost(java.awt.event.FocusEvent evt) {
                txtalamatFocusLost(evt);
            }
        });

        txttlp.addFocusListener(new java.awt.event.FocusAdapter() {
            @Override
            public void focusGained(java.awt.event.FocusEvent evt) {
                txttlpFocusGained(evt);
            }
            @Override
            public void focusLost(java.awt.event.FocusEvent evt) {
                txttlpFocusLost(evt);
            }
        });

        btnsimpan.setText("Simpan");
        btnsimpan.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnsimpanActionPerformed(evt);
            }
        });

        btnbatal.setText("Batal");
        btnbatal.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnbatalActionPerformed(evt);
            }
        });

       

        btnubah.setText("Ubah");
        btnubah.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnubahActionPerformed(evt);
            }
        });

        btnhapus.setText("Hapus");
        btnhapus.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnhapusActionPerformed(evt);
            }
        });

        btnkeluar.setText("Keluar");
        btnkeluar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnkeluarActionPerformed(evt);
            }
        });

        txtarea.setColumns(20);
        txtarea.setRows(5);
        txtarea.addMouseListener(new java.awt.event.MouseAdapter() {
            @Override
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                txtareaMouseClicked(evt);
            }
            @Override
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                txtareaMouseReleased(evt);
            }
        });
        jScrollPane1.setViewportView(txtarea);

        jLabel4.setText("Nama               Alamat                Telepon");


        pack();
    }// </editor-fold>

    private void txtnamaActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:

    }

    private void loncat(java.awt.event.KeyEvent evt) {
        // TODO add your handling code here:
    }

    private void txtnamaKeyReleased(java.awt.event.KeyEvent evt) {
        // TODO add your handling code here:

    }

    private void txtnamaFocusLost(java.awt.event.FocusEvent evt) {
        // TODO add your handling code here:
        txtnama.setBackground(Color.white);
    }



    private void txtnamaFocusGained(java.awt.event.FocusEvent evt) {
        // TODO add your handling code here:
        txtnama.setBackground(Color.LIGHT_GRAY);
    }

 

    private void txtalamatFocusGained(java.awt.event.FocusEvent evt) {
        // TODO add your handling code here:
        txtalamat.setBackground(Color.LIGHT_GRAY);
    }

    private void txttlpFocusGained(java.awt.event.FocusEvent evt) {
        // TODO add your handling code here:
        txttlp.setBackground(Color.LIGHT_GRAY);
    }

    private void txtalamatFocusLost(java.awt.event.FocusEvent evt) {
        // TODO add your handling code here:
        txtalamat.setBackground(Color.white);
    }

    private void txttlpFocusLost(java.awt.event.FocusEvent evt) {
        // TODO add your handling code here:
        txttlp.setBackground(Color.white);
    }

     private void txtareaMouseClicked(java.awt.event.MouseEvent evt) {
        // TODO add your handling code here:

    }

    private void txtareaMouseReleased(java.awt.event.MouseEvent evt) {
        // TODO add your handling code here:
        txtarea.isEnabled();
    }


    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new PhoneBook().setVisible(true);

            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JButton btnbatal;
    private javax.swing.JButton btnhapus;
    private javax.swing.JButton btnkeluar;
    private javax.swing.JButton btnsimpan;
    private javax.swing.JButton btnubah;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextField txtalamat;
    private javax.swing.JTextArea txtarea;
    private javax.swing.JTextField txtnama;
    private javax.swing.JTextField txttlp;
    // End of variables declaration
}


3. Jalankan Programnya dan hasilnya seperti berikut:


Selamat mencoba.....!!!!!
   

Menggambar Gelombang Menggunakan Netbeans

Untuk menggambar gelombang di Netbeans kita cukup menggunakan dua Class yaitu: Class Gelombang dan Class GambarGelombang (nama class bisa diganti tetapi ketika mengganti nama class jangan lupa menyesuaikan codingnya)..

Berikut adalah coding untuk masing-masing class ;

Coding untuk Class Gelombang:

package gelombag;

import javax.swing.JFrame;

/**

 *

 * @author Natan

 */

public class Gelombang extends JFrame {

        public Gelombang() {

            setTitle ("Menggambar Gelombang");

            add (new GambarGelombang ());

        }

  public static void main(String[] args) {

        Gelombang frame = new Gelombang ();

        frame.setLocationRelativeTo(null);

        frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE) ;

        frame.setSize(400, 250);

        frame.setVisible (true);

  }

}

**************************************

Coding untuk Class GambarGelombang:

package gelombag;

import java.awt.Graphics;

import java.awt.Polygon;

import javax.swing.JPanel;

/**

 *

 * @author Natan

 */

  public class GambarGelombang extends JPanel {

    @Override

    protected void paintComponent(Graphics g){

      super.paintComponent(g);

      Polygon p = new Polygon();

     for (int x = -100; x <=100; x++) {

  p.addPoint(x + 200, 100 - (int)(50 * Math.sin((x / 100.0) * 2 * Math.PI)));

 

}

g.drawPolygon(p);

    }

  }

***************************************************

Dan saat kita jalankan programnya hasilnya akan tampak seperti gambar berikut: