Using containers in Java:

An object of class Window provides a top-level window without borders or a title bar. As it stands it is not entirely useful, except for implementing a pop-up window, but it forms the basic building unit for the Window subclasses. The JFrame subclass, for example, has borders and a title bar and is normally used as the root window for building stand­ alone Java applications. 

The following code is a very simple application that displays a frame and sets the title of the window:

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

public class FrameDemo extends JFrame
{
public FrameDemo (String title)
{
setSize(200, 200);
setTitle(title);
}
}

To run the code we use the following class:

public class FrameDemoTest
{
public static void main (String [] args)
{
FrameDemo fd = new FrameDemo("We Love Java");
fd.setVisible(true);
}
}

Remember that a JFrame object is normally used for applications. The above code creates a frame, sizes the frame (to 200 by 200 pixels), sets the title and then displays it on the screen using the method setVisible(true). Once you have an object that is described by a class that is a subclass of the Container class (for example, JFrame) then you can add other user interface elements quite easily. If you run the code for class FrameDemoTest, you will see a simple window on your screen. The screen shot corresponding to the code above is shown in Figure.

Figure: A simple frame showing only a title, the standard icon and the window buttons

If you press the close box in the top right-hand corner, the window disappears as you would expect. However, the program has not stopped running. In order to stop the program you will need to use the facilities of your IDE interface. 

Once you have created a top-level frame you can use the JPanel class to divide it up into manageable sections.

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