Swing JTextField

In this tutorial you will learn about the Swing JTextField and its application with practical example.

JTextField is a Lightweight single line component which allows user for editing. It extends JTextComponent and implements SwingConstants.

Table Of Contents−

Swing JTextField

JTextField Class Declaration

public class JTextField extends JTextComponent implement SwingConstant

1	public class JTextField extends JTextComponent implement SwingConstant

JTextField Constructor

Some commonly useable constructors are listed below.

JTextField : This constructor is used to construct new Text Field.

JTextField(Document doc,String text, int columns): This constructor is used to construct a Text Field which used the given text storage model and the given number of columns.

JTextField(int columns) :This constructor is used to construct a empty Text Field with given number of columns.

JTextField(String text): This constructor is used to construct a Text field initialized with specific text.

JTextField(String text, int columns): This constructor is used to construct a Text field initialized with specific text and columns.

JTextField Methods

Some of Commonly useable methods are listed below.

void addActionListener(ActionListener l): This method is used to adds the specific action listener to receive action events from Text Field.

int getColumns(): This method is used to get number of columns of particular Text Field and return type is Integer.

Action getAction():This method is used to returns currently set Action .

int getHorizontalAlignement(): This method return integer value of horizontal alignment of the text.
void setFont(Font f): This method is used to sets the current font.

void setHorizontalAlignment(int aligment):This method is used to sets the horizontal alignment of text.

void removeActionListener(ActionListener listener): With the help of this method we can remove any specific listener so that text field Is no longer to receives any specific action events.

Example :-

Let’s do coding for Text Field, With the help of below program you can simply get understand about JTextField.

W3AddASwing.java

Create a class and put down below code into the class.

package w3addaswing;

import javax.swing.JFrame;
import javax.swing.JTextField;

public class W3ADDASwing {

    public static void main(String[] args) {
        // TODO code application logic here
JFrame frame = new JFrame("JTextField Example W3ADDA");
           JTextField textfield;  
        textfield = new JTextField("Text Field W3Adda Tutorial");
        textfield.setBounds(50, 150, 200, 30);
        frame.add(textfield);
       
        frame.setSize(400, 400);
        frame.setLayout(null);
        frame.setVisible(true);
    }
}

package w3addaswing;

import javax.swing.JFrame;

import javax.swing.JTextField;

public class W3ADDASwing {

public static void main(String[] args) {

// TODO code application logic here

JFrame frame = new JFrame("JTextField Example W3ADDA");

JTextField textfield;

textfield = new JTextField("Text Field W3Adda Tutorial");

textfield.setBounds(50, 150, 200, 30);

frame.add(textfield);

frame.setSize(400, 400);

frame.setLayout(null);

frame.setVisible(true);

}

Output :-

Output of this code will look like below image.

This was simple article to get understand about JTextField. I Hope from this article you got clear idea about JTextField.

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Swing JTextField