Exam 7: A First Look at Gui Applications

Why doesn't the following code compile correctly? import java.awt.*; Import java.awt.event.*; Import javax.swing.*; Public class ColorCheckBoxWindow extends JFrame { Private JCheckBox greenCheckBox; Private final int WINDOW_WIDTH = 300,WINDOW_HEIGHT = 100; Public ColorCheckBoxWindow() { SetTitle("Green Check Box"); SetSize(WINDOW_WIDTH,WINDOW_HEIGHT); SetDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); GreenCheckBox = new JCheckBox("Green"); GreenCheckBox.addItemListener(new CheckBoxListener()); SetLayout(new FlowLayout()); Add(greenCheckBox); SetVisible(true); } Public void itemStateChanged(ItemEvent e) { If (e.getSource()== greenCheckBox) { System.exit(0); } } }

To include Swing and AWT components in your program,use the following import statements

Which of the following statements is not true?

Assume that radio references a JRadioButton object.To click the radio button in code,use the following statement.

When a component is added to a region in the BorderLayout manager,

In Java,the ability to display splash screens was introduced in Java 6.

What will be the result of executing the following statement? panel.setBorder(BorderFactory.createLineBorder(Color.BLUE,5));

The following statement adds the FlowLayout manager to the container,centers the components,and separates the components with a gap of 10 pixels. setLayout(new FlowLayout());

To use the Color class,which is used to set the foreground and background of various objects,use the following import statement

This is a graphic image that is displayed while an application loads into memory and starts up.

Which of the following statements creates a class that is extended from the JFrame class?

Which of the following statements is not true?

When an application uses many components,rather than deriving just one class from the JFrame class,it is often better to encapsulate smaller groups of related components and their event listeners into their own class.A commonly used technique to do this is:

To end an application,pass this as the argument to the JFrame class's setDefaultCloseOperation()method.

Which of the following is not a rule for the FlowLayout manager?

Check boxes may be grouped in a ButtonGroup like radio buttons are.

When an application uses many components,instead of extending just one class from the JFrame class,a better approach is to

The GridLayout manager limits each cell to only one component.To put two or more components in a cell,do this.

This layout manager arranges components in rows.

When you write an action listener class for a JButton component,it must