Question 1

Match between columns
                        Premises: Use when you need to add components into a grid of rows and columns; each component is the same size
A type of event generated by mouse manipulation
Resides above the content pane
Allows the user to scroll initially invisible parts of the pane into view
A key that does not generate a character, such as a function key
Use when you need to set size, placement, and alignment constraints for every component that you add
Use this class to greatly increase the number of possible component arrangements
Can be used with the setBackground() and setForeground() methods of the Component class
The default size of a component

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Question 2

Describe the two CardLayout constructors.

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Question 3

The above figure shows a JFrame with a horizontal JMenuBar named myMenu that holds two JMenu s: menu1 and menu2 . A submenu and JMenuItem s also exist with the Colors yellows , blues , and greens . Using the add() method, write the statements to add the JMenu s to the JMenuBar , and write the statements to add a submenu and JMenuItem s to the Colors menu.

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Question 4

What is a mnemonic? Provide an example of adding a mnemonic.

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Question 5

What is an adapter class?

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Question 6

Write the statement to set the background color of a button named goBtn to a color of green.

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Question 7

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

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Question 8

import java.awt.*; 
import javax.swing.*; 
import java.awt.Color; 
public class JFrameWithColor extends JFrame 
{ 
    private final int SIZE = 180; 
    private Container con = getContentPane(); 
    private JButton button = 
      new JButton("Press Me"); 
   public JFrameWithColor() 
   { 
      super("Frame"); 
      setSize(SIZE, SIZE); 
      con.setLayout(new FlowLayout()); 
      con.add(button); 
      -----Code here----- 
      -----Code here----- 
      -----Code here----- 
   } 
   public static void main(String[] args) 
   { 
       JFrameWithColor frame = 
         new JFrameWithColor(); 
       frame.setVisible(true); 
   } 
} In the first indicated line, write the statement to set the background color of the JFrame 's content pane to gray. Using the remaining two indicated lines, write the statements to set the JButton foreground color to white and the background color to blue.

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import javax.swing.*; 
import java.awt.Color; 
public...

Question 9

Write the statement to create a Color object named myGray with red, green, and blue values of 100 each.

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Question 10

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

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Question 11

Write the code to create a scroll pane named myScroll that will display an image named scenery with a vertical scroll bar always present and a horizontal scroll bar as needed.

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Question 12

How do you find the red, green, and blue components of a color?

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Question 13

When do you need to worry about using the getContentPane() method?

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Question 14

import javax.swing.*; 
import java.awt.*; 
public class JDemoGridLayout extends JFrame 
{ 
   private JButton b1 = new JButton("Button 1"); 
   private JButton b2 = new JButton("Button 2"); 
   private JButton b3 = new JButton("Button 3"); 
   private JButton b4 = new JButton("Button 4"); 
   private JButton b5 = new JButton("Button 5"); 
   -----Code here----- 
   private Container con = getContentPane(); 
   public JDemoGridLayout() 
   { 
     con.setLayout(layout); 
     con.add(b1); 
     con.add(b2); 
     con.add(b3); 
     con.add(b4); 
     con.add(b5); 
     setSize(200, 200); 
   } 
   public static void main(String[] args) 
   { 
     JDemoGridLayout frame = new JDemoGridLayout(); 
     frame.setVisible(true); 
   } 
} 
Using the above code, write the statement in the indicated line to establish a GridLayout with three horizontal rows and two vertical columns, with horizontal and vertical gaps of five pixels each.

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import java.awt.*; 
public class JDemoGridLayout...

Question 15

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

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Question 16

Describe the difference between an ActionEvent and a MouseEvent .

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Question 17

Write the statement that will provide a shortcut menu key for a menu named myShortcutMenu . When a user presses Alt+F on the keyboard, the statement will set the F in File (shown in the above figure) as the mnemonic.

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Write the statement that will provide...

Question 18

What are the four methods defined in the Component class for adding event listeners?

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Question 19

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*; 
public class JMouseActionFrame extends JFrame implements MouseListener 
{ 
   private int x, y; 
   private JLabel label = new JLabel("Do something with the mouse"); 
   String msg = ""; 
   public JMouseActionFrame() 
   { 
      setTitle("Mouse Actions"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
      setLayout(new FlowLayout()); addMouseListener(this); 
      add(label); 
   } 
   public void mouseClicked(MouseEvent e) 
   { 
      int whichButton = e.getButton(); msg = "You pressed mouse "; 
      if(whichButton == MouseEvent.BUTTON1) 
         msg += "button 1."; 
      else 
         if(whichButton == MouseEvent.BUTTON2) 
            msg += "button 2."; 
         else 
            msg += "button 3."; 
      msg += " You are at position " + 
         e.getX() + ", " + e.getY() + "."; 
      if(e.getClickCount() == 2) 
         msg += " You double-clicked."; 
      else 
         msg += " You single-clicked."; 
      label.setText(msg); 
} 
@Override 
public void mouseEntered(MouseEvent e) 
{ 
   msg = "You entered the frame."; 
   label.setText(msg); 
} 
@Override 
public void mouseExited(MouseEvent e) 
{ 
   msg = "You exited the frame."; 
   label.setText(msg); 
} 
@Override 
public void mousePressed(MouseEvent e) 
{ 
} 
@Override 
public void mouseReleased(MouseEvent e) 
{ 
} 
@Override 
public static void main(String[] args) 
{ 
   JMouseActionFrame mFrame = new JMouseActionFrame(); 
   final int WIDTH =  750; final int HEIGHT  =  300; mFrame.setSize(WIDTH, HEIGHT);                mFrame.setVisible(true); 
} 
} 
The above code shows a JMouseActionFrame application that demonstrates several of the mouse listener and event methods. The constructor sets a frame title by passing it to the parent of JMouseActionFrame , sets a close operation, sets the layout manager, enables the frame to listen for mouse events, and adds the JLabel to the JFrame . However, most of the action occurs in the mouseClicked() method. Describe what actions occur in this method.

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import java.awt.*; 
import java.awt.event.*; 
public...

Question 20

List and describe the four constructors that can be used when creating a JPanel object.

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Quiz 15: Advanced Gui Topics

Match each term with the correct statement below.