import javax.swing.*;
import java.awt.event.*;
class TextFieldExample 
{
    public static void main(String[] args) 
    {
        JFrame f=new JFrame();
        final JTextField text=new JTextField(20);
        JButton b=new JButton("Get");

        b.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e) {
       String str=text.getText();
       JOptionPane.showMessageDialog(null,"You have entered: "+str);
      }
    });
    text.setBounds(10,10,150,20);
    b.setBounds(10,30,100,20);
    f.setLayout(null);
    f.add(text);
    f.add(b);
    f.setVisible(true);
    f.setSize(300,100);
  }
}