What are the correct answers ?

Question

after doing one sample swing application, i assumed the exam will be easy. when i took the exam, i couldn't do anything...
what are the correct answers ??/
  Which one of the following converts the Image i into the BufferedImage bi? 
Choice 1  
bi = new BufferedImage(0, 0, BufferedImage.TYPE_INT_RGB);
Graphics2D g = (Graphics2D)bi.createGraphics();
g.drawImage(i,i.getHeight(this),i.getWidth(this)); 
Choice 2  
bi = new BufferedImage(i.getWidth(this), i.getHeight(this), 1);
bi.drawImage(i,0,0,this); 
Choice 3  
bi = new BufferedImage(i.getWidth(this), i.getHeight(this), 1);
Graphics2D g = (Graphics2D)bi.createGraphics();
g.drawImage(i,0,0,this); 
Choice 4  
bi = new BufferedImage(i, i.getWidth(this), i.getHeight(this), BufferedImage.TYPE_INT_RGB); 
Choice 5  
bi = new BufferedImage(i, i.getWidth(this), i.getHeight(this)); 
CardLayout
BorderLayout
FlowLayout
GridBagLayout
GridLayout 
  Which one of the following indicates all of the layout managers (from the list above) that allow you to set the space between the components from an instance of the LayoutManager itself? 
Choice 1  
CardLayout, FlowLayout, GridBagLayout, GridLayout 
Choice 2  
GridBagLayout 
Choice 3  
BorderLayout, GridLayout 
Choice 4  
BorderLayout, FlowLayout, GridLayout 
Choice 5  
BorderLayout, CardLayout, FlowLayout, GridBagLayout, GridLayout 
JFrame jf = new JFrame();
jf.setSize(400,400);
JTextField jtf = new JTextField("JTextField");
JButton jb = new JButton("JButton");
jf.getContentPane().setLayout(
                      new FlowLayout(FlowLayout.LEFT,1,2));
jf.getContentPane().add(jtf);
jf.getContentPane().add(jb); 
  Which one of the following indicates the positions of the JTextField jtf and JButton jb relative to the JFrame and each other? 
Choice 1  
jtf and jb are in the top-center of the Jframe; jtf is to the left of jb, 2 pixels apart. 
Choice 2  
jb is in the top-right corner of the JFrame with jtf 1 pixel to the left of it. 
Choice 3  
jtf is in the top-left corner of the JFrame with jb 1 pixel to the right of it. 
Choice 4  
jb is in the top-right corner of the JFrame with jtf 2 pixels to the left of it. 
Choice 5  
jtf is in the top-left corner of the JFrame with jb 2 pixels to the right of it
public void drawText(Graphics2D g, String text){
  Font f = new Font("Century Gothic", Font.BOLD, 10);
  g.setFont(f);
  g.drawString(text, 20, 20);
  Given the above sample code, what happens if the "Century Gothic" font is NOT available? 
Choice 1  
The Font() constructor fails, causing "f" to be null, and the setFont() method throws a NullPointerException. 
Choice 2  
"Century Gothic" is a built in Java font, which always exists within the Java runtime environment. 
Choice 3  
The code does not compile because only the following "logical" font names are supported in Java: Dialog, DialogInput, Monospaced, Serif, SansSerif, and Symbol. 
Choice 4  
The Font() constructor throws an IllegalArgumentException. 
Choice 5  
A default Font object is returned and is used
Sample Code 
public void drawText(Graphics2D g, String text){
  Font f = new Font("Century Gothic", Font.BOLD, 10);
  g.setFont(f);
  g.drawString(text, 20, 20);
  Given the above sample code, what happens if the "Century Gothic" font is NOT available? 
Choice 1  
The Font() constructor fails, causing "f" to be null, and the setFont() method throws a NullPointerException. 
Choice 2  
"Century Gothic" is a built in Java font, which always exists within the Java runtime environment. 
Choice 3  
The code does not compile because only the following "logical" font names are supported in Java: Dialog, DialogInput, Monospaced, Serif, SansSerif, and Symbol. 
Choice 4  
The Font() constructor throws an IllegalArgumentException. 
Choice 5  
A default Font object is returned and is used. 
How must do you interact with a JTextField in order to generate an ActionEvent? 
Choice 1  
Tab into the JTextField from another Component. 
Choice 2  
Type in the JTextField. 
Choice 3  
Activate the cursor in the JTextField. 
Choice 4  
Hit <RETURN> while the cursor is in the JTextField. 
Choice 5  
Hit the spacebar while typing in the JTextField. 
double-buffering
public class TimerTest implements ActionListener{
  public static void main(String[] args){
    TimerTest test = new TimerTest();
    javax.swing.Timer timer = new javax.swing.Timer(100,test);
  public void actionPerformed(ActionEvent ev){
    System.out.println("Timer ticked.");
  Given the above sample code, what is the result when the code is run? 
Choice 1  
The words "Timer ticked." are printed to the console once after 100 milliseconds. 
Choice 2  
The words "Timer ticked." are printed to the console every 100 microseconds. 
Choice 3  
The words "Timer ticked." are printed to the console every 100 seconds. 
Choice 4  
The words "Timer ticked." are printed to the console every 100 milliseconds. 
Choice 5  
Nothing, the Timer is not started. 
1. JSlider slider1 = new JSlider (JSlider.VERTICAL, 0, 100, 50);
2. slider1.setPaintTicks(false);
3. slider1.setMajorTickSpacing(10);
4. slider1.setMinorTickSpacing(2); 
  What changes do you have to make to the above Sample code so that there are six Major Ticks and four Minor ticks between each Major Tick? 
Choice 1  
Replace line 3 with slider1.setMajorTickSpacing(17); 
Choice 2  
Replace line 2 with slider1.setPaintTicks(true);
Replace line 3 with slider1.setMajorTickSpacing(17);
Replace line 4 with slider1.setMinorTickSpacing(5); 
Choice 3  
Replace line 3 with slider1.setMajorTickSpacing(5);
Replace line 4 with slider1.setMinorTickSpacing(4); 
Choice 4  
Replace line 2 with slider1.setPaintTicks(true);
Replace line 3 with slider1.setMajorTickSpacing(20);
Replace line 4 with slider1.setMinorTickSpacing(4); 
Choice 5  
Replace line 4 with slider1.setMinorTickSpacing(6); 
   Which one of the following defines a set of three JRadioButtons (b1, b2, and b3) so that only one JRadioButton can be selected at a time? 
Choice 1  
ButtonGroup g = new ButtonGroup();
g.add(b1); g.add(b2); g.add(b3); 
Choice 2  
b1.group(true); b2.group(true); b3.group(true); 
Choice 3  
JRadioButton jbs[] = {b1, b2, b3};
ButtonGroup g = new ButtonGroup(jbs); 
Choice 4  
The default behavior of JRadioButtons is such that only one can be selected at a time as long as they are in the same Container. 
Choice 5  
ButtonGroup g = new ButtonGroup(b1, b2, b3); 
Sample Code 
public static void main(String args[]){
  What is the role of the method in the code above? 
Choice 1  
To provide a place for initialization code when instantiating the current class. 
Choice 2  
It is the first method run when a class is run with the Java Interpreter. 
Choice 3  
It serves no specific function. It is a residual method from Java 1.0. 
Choice 4  
It is the first method that the Java Compiler converts to bytecode when creating a .class file. 
Choice 5  
To process command-line parameters when running the Java Interpreter 
How do you create a menu item, Save, with a shortcut key of Ctrl+S? 
Choice 1  
You have to override the KeyPressed event of the top level Frame and handle the Ctrl+S to call the menu item's actionPerformed. 
Choice 2  
JMenuItem save = new JMenuItem("Save");
save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,Event.CTRL_MASK)); 
Choice 3  
JMenuItem save = new JMenuItem("Save");
save.enableShortcut(KeyEvent.CTRL_KEY + KeyEvent.S); 
Choice 4  
JMenuItem save = new JMenuItem("Save");
save.setMnemonic("Ctrl+S"); 
Choice 5  
JMenuItem save = new JMenuItem("Save");
save.addShortcutKey( new KeyStroke(KeyStroke.S | KeyStroke.CTRL_KEY) ); 
GridBagConstraints gbc1 = new GridBagConstraints(1,1,2,1,1,3,10,1,new Insets(5,5,5,5),1,1);
gbl.addLayoutComponent(jb,gbc1); 
  In regards to the above code, which one of the following indicates jb's grid position? 
Choice 1  
Grid position 2,1 
Choice 2  
Grid position 1,2 
Choice 3  
Grid position 1, 1 
Choice 4  
Grid position 10, 1 
Choice 5  
Grid position 1, 3 
GridBagConstraints gbc1 = new GridBagConstraints(1,1,2,1,1,3,10,1,new Insets(5,5,5,5),1,1);
gbl.addLayoutComponent(jb,gbc1); 
  In regards to the above code, which one of the following indicates jb's grid position? 
Choice 1  
Grid position 2,1 
Choice 2  
Grid position 1,2 
Choice 3  
Grid position 1, 1 
Choice 4  
Grid position 10, 1 
Choice 5  
Grid position 1, 3 
Which one of the following is necessary when changing an Applet to a standalone application? 
Choice 1  
Add a no-argument constructor. 
Choice 2  
Remove the init(), start() and stop() methods. 
Choice 3  
Remove "extends JApplet" or "extends Applet". 
Choice 4  
Add a main() method. 
Choice 5  
Change the import statement so that it imports an Application container rather than Applet or JApplet. 
Which one of the following adds the String "Java" to the JComboBox jcb? 
Choice 1  
ComboBoxModel cbm = jcb.getModel();
cbm.addItem("Java"); 
Choice 2  
jcb.setText("Java"); 
Choice 3  
ComboBoxModel cbm = jcb.getModel();
cbm.add("Java"); 
Choice 4  
jcb.add("Java"); 
Choice 5  
jcb.addItem("Java");

Answer 1

I'll have a go but I am not saying they are all correct...
Question 1.
Which one of the following converts the Image i into the BufferedImage bi?
Choice 3 (assuming this implements the imageobserver interface)
bi = new BufferedImage(i.getWidth(this), i.getHeight(this), 1);  //1 is BufferedImage.TYPE_INT_RGB
Graphics2D g = (Graphics2D)  
bi.createGraphics();
g.drawImage(i,0,0,this);Good luck with your homework...
nes
Question 2.
CardLayout
BorderLayout
FlowLayout
GridBagLayout
GridLayout
Which one of the following indicates all of the layout managers (from the list above) that allow you to set the space between the components from an instance of the LayoutManager itself?
Choice 4
BorderLayout,
FlowLayout,
GridLayout
(GridBagLayout uses GridBagConstraints to decide component spacing, card layout does not provided component spacing due to the deck nature used)
Question 3.
JFrame jf = new JFrame();
jf.setSize(400,400);
JTextField jtf = new JTextField("JTextField");
JButton jb = new JButton("JButton");
jf.getContentPane().setLayout( new FlowLayout(FlowLayout.LEFT,1,2));
jf.getContentPane().add(jtf);
jf.getContentPane().add(jb);    Which one of the following indicates the positions of the JTextField jtf and JButton jb relative to the JFrame and each other?
Choice 3 jtf is in the top-left corner of the JFrame with jb 1 pixel to the right of it.
Question 4
public void drawText(Graphics2D g, String text)
     Font f = new Font("Century Gothic", Font.BOLD, 10);  
     g.setFont(f);  
     g.drawString(text, 20, 20);
}    Given the above sample code, what happens if the "Century Gothic" font is NOT available?
Choice 5 A default Font object is returned and is used
Question 5.
How must do you interact with a JTextField in order to generate an ActionEvent?
Choice 4 Hit <RETURN> while the cursor is in the JTextField.
Question 6.
public class TimerTest implements ActionListener
     public static void main(String[] args)
           TimerTest test = new TimerTest();    
           javax.swing.Timer timer = new javax.swing.Timer(100,test);  
     public void actionPerformed(ActionEvent ev)
          System.out.println("Timer ticked.");  
}    Given the above sample code, what is the result when the code is run?
Choice 5 Nothing, the Timer is not started.
Question 7.
1. JSlider slider1 = new JSlider (JSlider.VERTICAL, 0, 100, 50);
2. slider1.setPaintTicks(false);
3. slider1.setMajorTickSpacing(10);
4. slider1.setMinorTickSpacing(2);    What changes do you have to make to the above Sample code so that there are six Major Ticks and four Minor ticks between each Major Tick?
Choice 4 Replace line 2 with slider1.setPaintTicks(true); Replace line 3 with slider1.setMajorTickSpacing(20); Replace line 4 with slider1.setMinorTickSpacing(4);
Question 8.
Which one of the following defines a set of three JRadioButtons (b1, b2, and b3) so that only one JRadioButton can be selected at a time?
Choice 1 ButtonGroup g = new ButtonGroup(); g.add(b1); g.add(b2); g.add(b3);
Question 9.
Sample Code
public static void main(String args[]){ }
TYPO - should be public static void main(String[] args){ }
What is the role of the method in the code above?
Choice 2 It is the first method run when a class is run with the Java Interpreter.
Question 10.
How do you create a menu item, Save, with a shortcut key of Ctrl+S?
Choice 2 JMenuItem save = new JMenuItem("Save");
save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,Event.CTRL_MASK));
Question 11.
GridBagConstraints gbc1 = new GridBagConstraints(1,1,2,1,1,3,10,1,new Insets(5,5,5,5),1,1); gbl.addLayoutComponent(jb,gbc1);
In regards to the above code, which one of the following indicates jb's grid position?
Choice 3 Grid position 1, 1
Question 12
Which one of the following is necessary when changing an Applet to a standalone application?
Choice 1 Add a no-argument constructor.
Choice 2 Remove the init(), start() and stop() methods.
Choice 3 Remove "extends JApplet" or "extends Applet".
Choice 4 Add a main() method.
Choice 5 Change the import statement so that it imports an Application container rather than Applet or JApplet.
mmm. not a good choice of answers. look at the following link...
http://forum.java.sun.com/thread.jsp?forum=57&thread=218096
Question 13.
Which one of the following adds the String "Java" to the JComboBox jcb?
Choice 5 jcb.addItem("Java");