The JTextField class object is a text component in which we can do the editing of a single line text.JTextField is a basic text control that lets the user enter a small amount text. It inherits JTextComponent class.
JTextField is generally used withGUI based data entry screens incommercial application or Applets.

Constructors used with JTextField

Type of Constructor	Constructor Description
JTextField()	This method creates a new TextField with no text and columns.
JTextField(String text)	This method creates a new TextField which is initialized with the specified text.
JTextField(int columns)	This method creates a new TextField without text but with the specified number of columns. .
JTextField(String text, int columns)	This method creates a new TextField which is initialized with the specified text and specified number of columns.

JTextField txt=new JTextField("Welcome to Compuhelp");

Basic Methods of JTextField class :

Method Name	Description
void setEditable(boolean) boolean isEditable()	Sets or gets whether the user can edit the text in the text field.
void setColumns(int) int getColumns()	Set or get the number of columns displayed by the text field.
void setText(String)	This method is used to set the specific text in the text field.
void setHorizontalAlignment(int) int getHorizontalAlignment()	Set or get how the text is aligned horizontally within its area.One can use JTextField.LEFT,JTextField.CENTER,JTextField.RIGHT for aligning text in the text field.
void addActionListener(ActionListener ae)	It is used to add the specified action listener to receive action events from this textfield.
void setFont(Font f)	It is used to set the current font.
void removeActionListener(ActionListener ae)	It is used to remove the specified action listener so that it no longer receives action events from this textfield.

import javax.swing.*;
import java.awt.*;

class TextFieldEx extends JFrame
{
JLabel lbl1;
JTextField txt1,txt2;
public TextFieldEx()
{
txt1=new JTextField("Swing Tutorial");
txt1.setBounds(100, 20, 150, 20);
add(txt1);
lbl1=new JLabel("Enter Name: ");
lbl1.setBounds(10, 50, 100, 20);
add(lbl1);
txt2=new JTextField();
txt2.setBounds(100, 50, 150, 20);
txt2.setToolTipText("Enter Name");
add(txt2);
setLayout(null);
setSize(350,300);

setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
public class TextFieldExample
{
public static void main(String[] args)
{
TextFieldEx txt=new TextFieldEx();
}
}

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import static java.lang.Integer.parseInt;

class TextFieldEx  extends JFrame implements ActionListener
{
JButton btn1,btn2;
JLabel lbl1,lbl2,lbl3 ;
JTextField txt1,txt2,txt3;
String str1,str2,str3;
int num1,num2,res;
public TextFieldEx()
{
lbl1=new JLabel(" Enter first number: ");
lbl2=new JLabel("Enter second number: ");
lbl3=new JLabel("              Result:");
btn1=new JButton("Sum");
btn2=new JButton("Clear");
txt1=new JTextField();
txt2=new JTextField();
txt3=new JTextField();
lbl1.setBounds(30, 40, 130, 50);
txt1.setBounds(180, 40, 200, 30);
lbl2.setBounds(30, 70, 130, 50);
txt2.setBounds(180, 80, 200, 30);
lbl3.setBounds(30, 110, 100, 50);
txt3.setBounds(180, 120, 200, 30);
btn1.setBounds(100, 180, 100, 30);
btn2.setBounds(210, 180, 100, 30);
add(lbl1);
add(txt1);
add(lbl2);
add(txt2);
add(lbl3);
add(txt3);
add(btn1);
add(btn2);
btn1.addActionListener(this);
btn2.addActionListener(this);
setTitle("Sum of Two Numbers");
setSize(450,300);
setLayout(null);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}

    public void actionPerformed(ActionEvent ae)
{
if(ae.getSource()==btn1)
{
str1=txt1.getText();
str2=txt2.getText();
num1=parseInt(str1);
num2=parseInt(str2);
res=num1+num2;
txt3.setText(String.valueOf(res));
}
if (ae.getSource()==btn2)
{
txt1.setText("");
txt2.setText("");
txt3.setText("");
txt1.requestFocus();
}
}
}
public class TextFieldExample
{
public static void main(String[] args)
{

        TextFieldEx text=new TextFieldEx();
}
}