Exam 20: Graphical User Interfaces

a(n. ____ is used when you have a large set of choices.

Examine the code below.What type of class is MyMenuListener? public JMenuItem makeMenuItem(String menuLabel) { JMenuItem mini = new JMenuItem(menuLabel); class MyMenuListener implements ActionListener { public void actionPerformed(ActionEvent e) { doSomething(); } } mini.addActionListener(new MyMenuListener()); return mi; }

What is known for certain from this correct code excerpt? ActionListener openListener = new FileOpenListener(); JMenuItem fileOpen = new JMenuItem("Open File"); fileOpen.addActionListener(openListener);

If the method makeMenuItem is called four times, how many MyMenuListener objects will be created? public JMenuItem makeMenuItem(String menuLabel) { JMenuItem mi = new JMenuItem(menuLabel); class MyMenuListener implements ActionListener { public void actionPerformed(ActionEvent e) { doSomething(); } } mi.addActionListener(new MyMenuListener()); return mi; }

You can add a(n) _________ to a panel to make it visible.

When a menu item is selected, what type of event does it send?

Which method can a program use to set the selected choice in a JComboBox?

The JFrame has a content pane with a default BorderLayout manager.Which method allows changing it to a FlowLayout manager?

The statement that would add smallButton to the button group in the following code is _________. JRadioButton smallButton = new JRadioButton("Small"); ButtonGroup group = new ButtonGroup();

When using a combo box, the _______ displays the name of the current selection.

Which GUI element allows text entry from the program user?

Consider the scope of the three objects menuLabel, mi, and the anonymous object new MyMenuListener() within the JmenuItem class.How do thier lifetimes compare? public JMenuItem makeMenuItem(final String menuLabel) { JMenuItem mi = new JMenuItem(menuLabel); class MyMenuListener implements ActionListener { public void actionPerformed(ActionEvent e) { doSomethingElse(); System.out.println(menuLabel); } } mi.addActionListener(new MyMenuListener()); return mi; }

Given four JRadioButton objects in a ButtonGroup, how many radio buttons can be selected at the same time?

Which of the following classes have a user-editable area?

What type does the method getSelectedItem in the JComboBox classreturn?