Event Handling

Lanjutan Dari Event Handling
TUGAS ;

1.             Membuat Program ChekBox.java

         

import java.awt.*; import java.awt.event.*; import javax.swing.*; class CheckBoxHandling extends JFrame implements ItemListener {  private JTextField teks;  private JPanel panel;  private JCheckBox cbTn1, cbTn2, cbTn3;  public CheckBoxHandling() { setTitle("Coba CheckBox Handling"); teks = new JTextField("Jenis Kelamin : Pilihan");             teks.setHorizontalAlignment(SwingConstants.CENTER); panel = new JPanel(new FlowLayout()); cbTn1 = new JCheckBox("Pria");        cbTn2 = new JCheckBox("Wanita"); cbTn3 = new JCheckBox("Banci"); ButtonGroup group = new ButtonGroup(); group.add(cbTn1); group.add(cbTn2); group.add(cbTn3); cbTn1.addItemListener(this); cbTn2.addItemListener(this); cbTn3.addItemListener(this); setLayout(new BorderLayout()); add(teks, "North");        add(panel, "West"); panel.add(cbTn1); panel.add(cbTn2); panel.add(cbTn3); pack(); setVisible(true); setLocation(200,200); setDefaultCloseOperation(EXIT_ON_CLOSE); } public void itemStateChanged(ItemEvent event) { if(event.getSource()==cbTn1) {   if(event.getStateChange()==ItemEvent.SELECTED)              teks.setText("Jenis Kelamin : Pria"); }        if (event.getSource()==cbTn2) {      if(event.getStateChange () ==ItemEvent.SELECTED)              teks.setText("Jenis Kelamin : Wanita");        } if(event.getSource()==cbTn3) {     if(event.getStateChange()==ItemEvent.SELECTED)                    teks.setText("Jenis Kelamin : Banci");        }  } } public class CheckBox {  public static void main (String[] args) {       new CheckBoxHandling();  } }

 

               

2.             Membuat Program Even Handling pada from Login.java


       
         

import javax.swing.*; import java.awt.event.*; public class login { static JFrame frame = new JFrame(); static JLabel lblUsername = new JLabel("Username"); static JLabel lblPasswd = new JLabel("Password"); static JTextField txtUsername = new JTextField(); static JPasswordField txtPasswd = new JPasswordField(); static JButton btnMasuk = new JButton("Masuk"); static int count = 0; public static void main(String[] args) {              Menu();              Handler(); } static void Menu() {              frame.setTitle("Menu Login Sederhana");              frame.setSize(250, 140);              frame.setLocationRelativeTo(null);              frame.setResizable(false); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);              frame.setVisible(true);              frame.setLayout(null);              frame.add(lblUsername);              frame.add(lblPasswd);              frame.add(txtUsername);              frame.add(txtPasswd);              frame.add(btnMasuk);              lblUsername.setBounds(20, 20, 100, 20);              lblPasswd.setBounds(20, 50, 100, 20);              txtUsername.setBounds(100, 20, 130, 20);              txtPasswd.setBounds(100, 50, 130, 20);              btnMasuk.setBounds(20, 80, 75, 20); } static void Handler() {   btnMasuk.addActionListener(new ActionListener()          {            public void actionPerformed(ActionEvent e)    { String username = txtUsername.getText().toString(); String passwd = txtPasswd.getText().toString(); if(username.equals("admin") && passwd.equals("admin"))        {                                                  JOptionPane.showMessageDialog(null, "Anda berhasil login"); }    else {                                                  JOptionPane.showMessageDialog(null, "Username/Password Anda salah!!!");             count++; }       if(count == 3) {                                                  JOptionPane.showMessageDialog(null, "Anda sudah gagal Login sebanyak 3 kali. Harap coba lagi nanti . . ."); System.exit(1);                                      }                          }              }); } }