Uvod u JButton na Javi
JButton klasa u Javi koristi se za izradu gumba s kojima se može izvoditi bilo koji ActionEvent kad god se klikne. Da bi se postiglo djelovanje događaja, treba implementirati sučelje ActionListener. Komponenta gumba u Swingu slična je komponenti komponente AWT gumba, osim što može sadržavati tekst, sliku ili oboje. JButton klasa proširuje klasu JComponent i može se koristiti u spremniku.
Izjava o klasi JButton
Izjava klase javax.swing.JButton nalazi se u nastavku:
public class JButton extends AbstractButton implements Accessible
Vrste konstruktora koji se koriste u klasi JButton
Postoji pet vrsta konstruktora koji se u osnovi koriste u klasi JButton:
1. JButton ()
Ovaj će konstruktor stvoriti gumb u komponenti bez ikone ili teksta.
Primjer
import java.awt.*;
import javax.swing.*;
public class JButtonExample (
public static void main(String() args) (
JFrame frame=new JFrame("Button Example");
JButton b=new JButton();
b.setPreferredSize(new Dimension(100, 30));
frame.add(b);
frame.setSize(500, 500);
frame.setLayout(new FlowLayout());
frame.setVisible(true);
)
)
Izlaz:
2. JButton (string string)
Ovaj će konstruktor stvoriti gumb u komponenti s navedenim tekstom u parametrima.
Primjer
import java.awt.*;
import javax.swing.*;
public class JButtonExample (
public static void main(String() args) (
JFrame frame=new JFrame("Button Example");
JButton b=new JButton("Click Here");
b.setPreferredSize(new Dimension(100, 30));
frame.add(b);
frame.setSize(500, 500);
frame.setLayout(new FlowLayout());
frame.setVisible(true);
)
)
Izlaz:
3. JButton (ikona img)
Ovaj će konstruktor stvoriti gumb u komponenti sa slikom img koja je data u parametrima.
Primjer
import java.awt.*;
import javax.swing.*;
public class JButtonExample (
public static void main(String() args) (
JFrame frame=new JFrame("Button Example");
JButton b=new JButton(new ImageIcon("C:\\custom.png.webp"));
frame.add(b);
frame.setSize(500, 500);
frame.setLayout(new FlowLayout());
frame.setVisible(true);
)
)
Izlaz:
4. JButton (radnja a)
Ovaj će konstruktor stvoriti gumb u komponenti sa svojstvima koje pruža parametar Action a.
Primjer
importawt.*;
import java.awt.event.ActionEvent;
import javax.swing.*;
public class JButtonExample extends JFrame(
private JButton reg;
private Action action = new buttonAction();
public JButtonExample() (
super("JButton Demo example");
setLayout(new FlowLayout());
reg = new JButton(action);
reg.setPreferredSize(new Dimension(100, 30));
add(reg);
)
public class buttonAction extends AbstractAction(
public void actionPerformed(ActionEvent e)
(
JOptionPane.showMessageDialog(null, "Button click");
)
)
public static void main(String() args) (
JButtonExample jb = new JButtonExample();
jb.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jb.setSize(300, 300);
jb.setVisible(true);
)
)
Izlaz:
5. JButton (Gudački tekst, img ikona)
Ovaj konstruktor će stvoriti gumb u komponenti s tekstom i određenom slikom u parametrima.
Primjer
import java.awt.*;
import javax.swing.*;
public class JButtonExample (
public static void main(String() args) (
JFrame frame=new JFrame("Button Example");
JButton b=new JButton("Click here", new ImageIcon("C:\\custom.png.webp"));
frame.add(b);
frame.setSize(500, 500);
frame.setLayout(new FlowLayout());
frame.setVisible(true);
)
)
Izlaz:
Metode klase JButton
Ispod su uobičajene metode u klasi JButton:
- Void setText (tekst niza): Ova metoda se u osnovi koristi za postavljanje određenog teksta na gumbu u komponenti.
- String getText (): Ova metoda koristi se za vraćanje teksta gumba u navedenoj komponenti.
- Void setEnabled (boolean b): Ova se metoda koristi za omogućavanje ili onemogućavanje gumba prosljeđivanjem odgovarajuće vrijednosti u parametru.
- Void setIcon (ikona i): Ova se metoda koristi za postavljanje određene ikone "I" na gumb.
- Ikona getIcon (): Ova metoda se koristi za vraćanje ikone određenog gumba.
- Void setHorizontalTextPosition (int hpos): Ova metoda se koristi za postavljanje horizontalnog položaja poruke gumba s obzirom na njenu ikonu.
- Void stVerticalTextPosition (int vpos): Ova se metoda koristi za postavljanje vertikalnog položaja poruke gumba s obzirom na ikonu.
Primjer JButton klase
Ispod je primjer klase JButton:
Rad CRUD-a na JTableu
package jbuttonapplication;
import javax.swing.table.DefaultTableModel;
public class NewJFrame extends javax.swing.JFrame (
public NewJFrame() (
initComponents();
)
private void initComponents() (
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
rno = new javax.swing.JTextField();
fname = new javax.swing.JTextField();
lname = new javax.swing.JTextField();
add = new javax.swing.JTextField();
jScrollPane1 = new javax.swing.JScrollPane();
jbtable = new javax.swing.JTable();
jbnew = new javax.swing.JButton();
jbadd = new javax.swing.JButton();
jbupdate = new javax.swing.JButton();
jbdelete = new javax.swing.JButton();
label = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("Roll No");
jLabel2.setText("First Name");
jLabel3.setText("Last Name");
jLabel4.setText("Address");
jbtable.setModel(new javax.swing.table.DefaultTableModel(
new Object ()() (
),
new String () (
"Roll No", "First Name", "Last Name", "Address"
)
) (
Class() types = new Class () (
java.lang.Integer.class, java.lang.String.class, java.lang.String.class, java.lang.String.class
);
public Class getColumnClass(int columnIndex) (
return types (columnIndex);
)
));
jbtable.addMouseListener(new java.awt.event.MouseAdapter() (
public void mouseClicked(java.awt.event.MouseEvent evt) (
jbtableMouseClicked(evt);
)
));
jScrollPane1.setViewportView(jbtable);
jbnew.setText("New");
jbnew.addActionListener(new java.awt.event.ActionListener() (
public void actionPerformed(java.awt.event.ActionEvent evt) (
jbnewActionPerformed(evt);
)
));
jbadd.setText("Add");
jbadd.addActionListener(new java.awt.event.ActionListener() (
public void actionPerformed(java.awt.event.ActionEvent evt) (
jbaddActionPerformed(evt);
)
));
jbupdate.setText("Update");
jbupdate.addActionListener(new java.awt.event.ActionListener() (
public void actionPerformed(java.awt.event.ActionEvent evt) (
jbupdateActionPerformed(evt);
)
));
jbdelete.setText("Delete");
jbdelete.addActionListener(new java.awt.event.ActionListener() (
public void actionPerformed(java.awt.event.ActionEvent evt) (
jbdeleteActionPerformed(evt);
)
));
label.setForeground(new java.awt.Color(204, 0, 0));
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(136, 136, 136)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel2)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel4)
.addComponent(jLabel3)
.addComponent(jbnew))))
.addGap(37, 37, 37)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(rno, javax.swing.GroupLayout.DEFAULT_SIZE, 200, Short.MAX_VALUE)
.addComponent(fname)
.addComponent(lname)
.addComponent(add))
.addGap(32, 32, 32)
.addComponent(label, javax.swing.GroupLayout.PREFERRED_SIZE, 375, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jbadd)
.addGap(46, 46, 46)
.addComponent(jbupdate)
.addGap(74, 74, 74)
.addComponent(jbdelete))))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(2, 2, 2)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(177, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(117, 117, 117)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(rno, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(label))
.addComponent(jLabel1))
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(fname, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel2))
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(lname, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel4)
.addComponent(add, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(46, 46, 46)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jbnew)
.addComponent(jbadd)
.addComponent(jbupdate)
.addComponent(jbdelete))
.addGap(52, 52, 52)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 130, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(328, Short.MAX_VALUE))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
pack();
)
private void jbnewActionPerformed(java.awt.event.ActionEvent evt) (
rno.setText("");
fname.setText("");
lname.setText("");
add.setText("");
)
private void jbaddActionPerformed(java.awt.event.ActionEvent evt) (
label.setText("");
DefaultTableModel model = (DefaultTableModel)jbtable.getModel();
if(!rno.getText().isEmpty()&&!fname.getText().isEmpty()
&&!lname.getText().isEmpty()&&!add.getText().isEmpty())
(
model.addRow(new Object()(rno.getText().trim(), fname.getText().trim(),
lname.getText().trim(), add.getText().trim()));
)
else
(
label.setText("All the fields should be filled");
)
)
private void jbtableMouseClicked(java.awt.event.MouseEvent evt) (
DefaultTableModel model = (DefaultTableModel)jbtable.getModel();
rno.setText(model.getValueAt(jbtable.getSelectedRow(), 0).toString());
fname.setText(model.getValueAt(jbtable.getSelectedRow(), 1).toString());
lname.setText(model.getValueAt(jbtable.getSelectedRow(), 2).toString());
add.setText(model.getValueAt(jbtable.getSelectedRow(), 3).toString());
)
private void jbupdateActionPerformed(java.awt.event.ActionEvent evt) (
label.setText("");
DefaultTableModel model = (DefaultTableModel)jbtable.getModel();
if(jbtable.getSelectedRow()==-1)
(
if(jbtable.getRowCount()==0)
(
label.setText("Table is Empty");
)
else
(
label.setText("No Row Selected to Update");
)
)
else
(
model.setValueAt(rno.getText(), jbtable.getSelectedRow(), 0);
model.setValueAt(fname.getText(), jbtable.getSelectedRow(), 1);
model.setValueAt(lname.getText(), jbtable.getSelectedRow(), 2);
model.setValueAt(add.getText(), jbtable.getSelectedRow(), 3);
)
)
private void jbdeleteActionPerformed(java.awt.event.ActionEvent evt) (
label.setText("");
DefaultTableModel model = (DefaultTableModel)jbtable.getModel();
if(jbtable.getSelectedRow()==-1)
(
if(jbtable.getRowCount()==0)
(
label.setText("Table is Empty");
)
else
(
label.setText("No Row Selected to Update");
)
)
else
(
model.removeRow(jbtable.getSelectedRow());
)
)
public static void main(String args()) (
try (
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) (
if ("Nimbus".equals(info.getName())) (
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
)
)
) catch (ClassNotFoundException ex) (
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
) catch (InstantiationException ex) (
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
) catch (IllegalAccessException ex) (
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
) catch (javax.swing.UnsupportedLookAndFeelException ex) (
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
)
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() (
public void run() (
new NewJFrame().setVisible(true);
)
));
)
// Variables declaration - do not modify
private javax.swing.JTextField add;
private javax.swing.JTextField fname;
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.JButton jbadd;
private javax.swing.JButton jbdelete;
private javax.swing.JButton jbnew;
private javax.swing.JTable jbtable;
private javax.swing.JButton jbupdate;
private javax.swing.JLabel label;
private javax.swing.JTextField lname;
private javax.swing.JTextField rno;
// End of variables declaration
)
Izlaz:
Zaključci - JButton na Javi
JButton klasa može se koristiti za stvaranje komponente gumba za provođenje promjena komponente na dinamičan način poput gornjeg primjera.
Preporučeni članci
Ovo je vodič za JButton na Javi. Ovdje ćemo raspravljati o vrstama konstruktora koji se koriste u klasi JButton zajedno s metodama i primjerom. Možete i proći naše druge predložene članke da biste saznali više -
- JTextField u Javi
- JDialog na Javi
- BorderLayout u Javi
- Izgled kartice na Javi
- JPanel u Javi (Konstruktori)
- Izgled grupe na Javi
- Primjeri JFrame u Javi
- JLabel u Javi
- Kompletan vodič za tijek protoka u Javi
- Metode i program JTable na Javi