What is the advantage of a layout manager over telling the container "place this component at position $(x, y)$ ”?

Write an application with three buttons labeled "Red", "Green", and "Blue" that changes the background color of a panel in the center of the frame to red, green, or blue.

Add icons to the buttons of above problem Use a JButton constructor with an Icon argument and supply an ImageIcon.

Is it a requirement to use inheritance for frames, as described in earlier Section? (Hint: Consider Special Topic)

How many methods does the JProgressBar component have? Be sure to count inherited methods. Look at the Java documentation.

How many Swing user-interface components are there? Look at the Java documentation to get an approximate answer.

What component would you use to show a set of choices, as in a combo box, but so that several items are visible at the same time? Run the Swing demo application or look at a book with Swing example programs to find the answer.

Why doesn't a JComboBox send out change events?

When browsing through the Java documentation for more information about sliders, we ignored the Jslider constructor with no arguments. Why? Would it have worked in our sample program?

What is the difference between a menu bar, a menu, and a menu item?

Modify the slider test program in Section $20.5$ to add a set of tick marks to each slider that show the exact slider position.

Why do you need a button group for radio buttons but not for check boxes?

Write a graphical application describing an earthquake. Supply a text field and button for entering the strength of the earthquake. Display the earthquake description in a label.

Write a graphical application simulating a bank account. Supply text fields and buttons for depositing and withdrawing money, and for displaying the current balance in a label.

What is the difference between radio buttons and check boxes?