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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TextDemo extends JFrame implements ActionListener{
    JButton y1;
    JTextField t;
    JPanel p;
    TextDemo(){
    Container c=getContentPane();
    FlowLayout gl=new FlowLayout();
    c.setLayout(gl);
    p=new JPanel();
    t=new JTextField(20);
    t.addActionListener(this);
    y1=new JButton("1");
    y1.addActionListener(this);
    c.add(p);
    p.add(t);
    p.add(y1);
    }
    public static void main(String args[]){
    JFrame jf=new TextDemo();
    jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    jf.setVisible(true);
    jf.pack();
    }
}
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Java code:

public class TextDemo extends JFrame implements ActionListener{
JButton y1;
JTextField t;
JPanel p;

TextDemo(){
Container c = getContentPane();
FlowLayout gl = new FlowLayout();
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