JavaProgrammingWorld.com

QUESTION : 1

  What will be the result of compiling and running the following code?
   import java.awt.*;
   import java.applet.*;
   public class AppletTest extends Applet {
     Label lbl = new Label("hello");
      public void init()
      {
      setSize(200,100);
      setVisible(true);
      lbl.setBackground(new Color(0,100,180));
      setLayout(new GridLayout(1,1));
      add(lbl);
      setLayout(new FlowLayout());
      lbl.setBounds(0,0,100,24);
      }
   }

1. The label will fill half the display area of the applet.
2. The label will be wide enough to display the text "hello"
3. The label will not be visiblle.
4. The label will fill the entire display area of the applet
5. The code will throw a run time error because of the second setLayout() call.

ANS : 2

QUESTION : 2

   What will be the result of compiling and running the following applet?
   import java.awt.*;
   import java.applet.*;
   public class AppletTest extends Applet {
      public void init()
      {
      super.init();
      PanelTest p = new PanelTest();
      p.init();
      setVisible(true);
      setSize(200,100);
      add(p);
   }

   class PanelTest extends Panel{
      Button b1 = new Button("Press me");
      public PanelTest()
      {
      setSize(200,100);
      setVisible(true);
      }
      public void init(){
      super.init();
      add(b1);
      }
     }
   }

1. The button will fill the entire display area of the applet.
2. The code will fail to compile.
3. The button will be just big enough to encompass it's label.
4. The applet's display area will be blank.

ANS : 2

QUESTION : 3
This code compiles without error.
class MyButton extends Button implements MouseListener{
 public MyButton(String lbl) {
   super(lbl);
   addMouseListener(this);
 }
 public void mousePressed(MouseEvent e){
 //do something
  }
}

1. False
2. True

ANS : 1

QUESTION : 4

    Which of the following are valid constructors for a TextField .

1. TextField();
2. TextField(int rows , int cols);
3. TextField(int cols , String txt);
4. TextField(int cols);
5. TextField(String txt , boolean scrollBars);

ANS : 1,4

QUESTION : 5

      True or false?
       void setResizable(boolean) is a member of the Applet class.

1. True
2. False

ANS : 2

QUESTION : 6

   What is the result of attempting to compile and run the following.
     import java.awt.*;
     import java.awt.event.*;
     class FrameTest extends Frame{
        Label lblTest  = new Label("TEST");
        Button btnTest = new Button(" TEST ");
        public static void main(String[] args){
          FrameTest ft = new FrameTest();
          ft.setLayout(new FlowLayout());
          ft.add(ft.lblTest);
          ft.add(ft.btnTest);
          ft.setSize(200,100);
          ft.setVisible(true);
          ft.enableEvents(AWTEvent.ACTION_EVENT_MASK);
        }
       public void processActionEvent(ActionEvent event){
          super.processActionEvent(event);
            if(event.getID() == AWTEvent.ACTION_EVENT_MASK){
              if(event.getSource() instanceof Button){
               lblTest.setText("OK");
               }
            }
        }
     }

1. The code will not compile
2. There will be a runtime error
3. The frame wil not be visible
4. Nothing happens when you click the button
5. The label's caption changes to "OK" when you click the button

ANS : 1

QUESTION : 7

  What is the default layout for a Dialog ?

1. FlowLayout
2. GridLayout
3. CardLayout
4. BorderLayout
5. GridBagLayout

ANS : 4

QUESTION : 8

     True or false.
      A Dialog is a subclass of Frame. 

1. True
2. False

ANS : 2

QUESTION : 9

  Which of the following are valid constructors for a MenuItem ?

1. MenuItem()
2. MenuItem(String name)
3. MenuItem(String name , boolean removable)
4. MenuItem(String name , MenuShortcut sc)
5. MenuItem(boolean check)

ANS : 1,2,4

QUESTION : 10

      What will this draw ?
     public class AppletTest extends Applet{
     public void init(){
     setVisible(true);
     setSize(200,200);
     }
     public void paint(Graphics g){
     g.setColor(new Color(0,0,255));
     g.drawRect(50, 100 , 100, 50);
     }
    }

1. A rectangle 50 pixels wide with top left corner at 100, 50.
2. A rectangle 50 pixels wide with top left corner at 50,100.
3. A rectangle 100 pixels wide with top left corner at 50,100.
4. A rectangle 100 pixels high with top left corner at 50,100.
5. A rectangle 100 pixels high with top left corner at 100,50. 

ANS : 3