Using Objects - Java Concepts - page 79

This frame will be 300 pixels wide and 400 pixels tall. If you omit this step the
frame will be 0 by 0 pixels, and you won't be able to see it.

3. If you'd like, set the title of the frame.

frame.setTitle("An Empty Frame");

If you omit this step, the title bar is simply left blank.

4. Set the Ȓdefault close operationȓ:

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Figure 21

A Frame Window

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When the user closes the frame, the program automatically exits. Don't omit this
step. If you do, the program continues running even after the frame is closed.

5. Make the frame visible.

frame.setVisible(true);