ex1

package example;

import java.awt.Color;
import javax.swing.GroupLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Example {

    public JFrame frame;
    public JPanel panel;
    public JButton btn;
    public JTextField txt;

    public Example()
    {
        init();
    }

    void init()
    {
        frame = new JFrame();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        frame.setSize(3 * 100, 3 * 100);
        frame.setLocation(350, 50);
        frame.setBackground(Color.BLUE);

        panel = new JPanel();
        frame.add(panel);
        panel.setVisible(true);
        //panel.setBackground(Color.GRAY);
        panel.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
        panel.setPreferredSize(new java.awt.Dimension(100, 100));

        btn = new JButton();
        panel.add(btn);
        btn.setSize(150, 50);
        btn.setVisible(true);
        btn.setLocation(100, 180);
        btn.setText("Button");

        txt = new JTextField();
        panel.add(txt);
        txt.setSize(50, 50);
        txt.setVisible(true);
        txt.setText("Text");
        txt.setLocation(100, 100);

        GroupLayout layout = new GroupLayout(panel);
        panel.setLayout(layout);
    }

    public static void main(String[] args) {
        // TODO code application logic here
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Example();
            }
        });
    }

}