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

public class AddAButton
{
  public AddAButton ()
  {
    JFrame frame = new JFrame("Add A Button");
    frame.setSize(300,300);

    Container content = frame.getContentPane();

    JButton button = new JButton("Look at Me");
    button.setToolTipText("I am a JButton.");
    content.add(button);

    frame.setVisible(true);
  }
  
  public static void main(String[] args)
  {
    new AddAButton();
  }
}