A good answer might be:

JFrame. (There is also an AWT Frame class, the parent class of JFrame).

Small GUI Program

A GUI program (usually) consists of (i) a GUI interface, (ii) listener methods, and (iii) application code. Our first GUI program does not have a listener nor any application code, and is not a useful program. But it will get us started. Here is the complete program:

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

public class TestFrame1
  public static void main ( String[] args )
    JFrame frame = new JFrame("Test Frame 1");
    frame.setVisible( true );

The setSize() method makes the rectangular area 200 pixels wide by 100 pixels high. The setVisible() method makes the frame appear on the screen (otherwise the frame object exists as an object in memory, but there is no picture for it).


Is this program an application or an applet?