Exam 15: Advanced Gui Topics

Match each term with the correct statement below. -Use when you need to set size, placement, and alignment constraints for every component that you add

The following statement produces a dark purple color that has green and blue components, but no red: Color darkPurple = new Color(100, 0, 100);

The parent class of MouseEvent is ____.

A(n) _________________________ is a tree of components that has a top-level container as its root (that is, at its uppermost level).

Which of the following statements will correctly add a JMenuBar named myBar to a JFrame?

Match each term with the correct statement below. -A key that does not generate a character, such as a function key

Any component you place on the screen has a vertical, or x-axis, position as well as a horizontal, or y-axis, position in the window.

With ____, a redrawn JPanel is displayed only when it is complete; this provides the viewer with updated screens that do not flicker while being redrawn.

To force the display of a scroll bar, you can use class variables defined in the ScrollPaneConstants class. What are they?

Describe the way in which components expand to fill their layout areas in FlowLayout and BorderLayout.

How would you arrange columns into equal rows and columns? Provide an example.

Using a FlowLayout object named myLayout, write the statement to set the layout of a content pane to left.

Clicking an item in a list box results in a(n) ____.

The state of a JCheckBoxMenuItem or JRadioButtonMenuItem can be determined with the ____ method.

If you do not specify alignment, Components are right-aligned in a FlowLayout Container by default.

Match each term with the correct statement below. -Resides above the content pane

The JMenus are added to the JMenuBar using the ____ method.

You use the getModifiers() method with an InputEvent object, and you can assign the return value to a(n) ____ variable.

Which of the following statements will set the background color of a button named stop to a color of red?

import java.awt.*; import javax.swing.*; import java.awt.Color; public class Checkerboard extends JFrame { private final int ROWS = 8; private final int COLS = 8; private final int GAP = 2; private final int NUM = ROWS * COLS; private int x; private JPanel pane = new JPanel (new GridLayout(ROWS, COLS, GAP, GAP)); private JPanel[] panel = new JPanel[NUM]; private Color color1 = Color.WHITE; private Color color2 = Color.BLUE; private Color tempColor; public Checkerboard() { super("Checkerboard"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); add(pane); for(x = 0; x < NUM; ++x) { panel[x] = new JPanel(); pane.add(panel[x]); if(x % COLS == 0) { tempColor = color1; color1 = color2; color2 = tempColor; } if(x % 2 == 0) panel[x].setBackground(color1); else panel[x].setBackground(color2); } } public static void main(String[] args) { Checkerboard frame = new Checkerboard(); final int SIZE = 300; frame.setSize(SIZE, SIZE); frame.setVisible(true); } } The above code creates a loop to fill even-positioned squares with one color and odd-positioned squares with another color, resulting in a checkerboard pattern. Describe how JPanels and a GridLayout are used to achieve this effect.