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What are the differences between a JTextField and a JFormattedTextField in Java?
A JTextField can be used for plain text whereas a JFormattedTextField is a class that can extend JTextField and it can be used to set any format to the text that it contains phone numbers, e-mails, dates and etc.
JTextField
- A JTextFeld is one of the most important components that allow the user to type an input text value in a single line format.
- A JTextField can generate an ActionListener interface when we try to enter some input inside the text field and it can generate a CaretListener interface each time the caret (i.e. the cursor) changes position.
- A JTextField can also generate a MouseListener and KeyListener interfaces.
Example
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JTextFieldTest extends JFrame {
JTextField jtf;
public JTextFieldTest() {
setTitle("JTextField Test");
setLayout(new FlowLayout());
jtf = new JTextField(15);
add(jtf);
jtf.addActionListener(new ActionListener() {
public void actionPerformed (ActionEvent ae) {
System.out.println("Event generated: " + jtf.getText());
}
});
setSize(375, 250);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
public static void main(String args[]) {
new JTextFieldTest();
}
}Output
JFomattedTextField
- A formatted text field is an instance of the class JFormattedTextField which is a direct subclass of JTextField.
- A JFormattedTextField is like a normal text field except that is controls the validity of the characters the user type and it can be associated with a formatter that specifies the characters the user can enter.
- A JFormattedTextField is a subclass of Format class to build a formatted text field. We can create a formatter, customize it if necessary. We can call the JFormattedTextField(Format format) constructor which takes an argument of type Format.
import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
public class JFormattedTextFieldTest extends JFrame {
JFormattedTextField jftf;
MaskFormatter mf;
public JFormattedTextFieldTest() {
setTitle("JFormattedTextField Test");
setLayout(new FlowLayout());
// A phone number formatter - (country code)-(area code)-(number)
try {
mf = new MaskFormatter("##-###-#######");
mf.setPlaceholderCharacter('#');
jftf = new JFormattedTextField(mf);
jftf.setColumns(12);
} catch(Exception e) {
e.printStackTrace();
}
add(jftf);
setSize(375, 250);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String args[]) {
new JFormattedTextFieldTest();
}
}Output
Updated on: 10-Feb-2020
1K+ Views
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