2.public class Test3{
   public void method(){ 
       System.out.println("Called");
   }
   public static void main(String[] args){
       method();
   }
}

Q12)What is need of wrapper class?

1)  class Top {

   static void myTop() {
      System.out.println("Testing myTop method in Top class");
   }
}
public class Down extends Top {

    void myTop() {
          System.out.println("Testing myTop method in Down class");
    }
    public static void main(String [] args) {
        Top t = new Down();
         t.myTop();
    }
}

A) Compile Time error
B) Runtime error
C) Prints Testing myTop method in Top class on the console
D) Prints Testing myTop method in Down class on the screen

2)   public class MyTest {

     final int x;
     public MyTest() {
         System.out.println( x + 10 );
     }
     public static void main( String args[] ) {
            MyTest mt = new MyTest();
     }
}

A) Compile time error
B) Runtime error
C) Prints on the screen 10
D) Throws an exception

3)    class MyTest {

   public void myTest() {
         System.out.println("Printing myTest in MyTest class");
   }

   public static void myStat() {
         System.out.println("Printing myStat in MyTest class");
   }
}

public class Test extends MyTest {

    public void myTest() {
         System.out.println("Printing myTest in Test class");
   }

   public static void myStat() {
         System.out.println("Printing myStat in Test class");
   }

   public static void main ( String args[] ) {

       MyTest mt = new Test();
       mt.myTest();
       mt.myStat();
   }
} 

A)   Printing myTest in MyTest class followed by Printing myStat in MyTest class
B) Printing myTest in Test class followed by Printing myStat in MyTest class
C) Printing myTest in MyTest class followed by Printing myStat in MyTest class
D) Printing myStat in MyTest class followed by Printing myStat in MyTest class

4)  Which of the following are examples of immutable classes , select all correct answer(s)?

A) String
B) StringBuffer
C) Double
D) Integer

5) Select the correct answer for the code fragment given below?

public class TestBuffer {

     public void myBuf( StringBuffer s, StringBuffer s1) {
            s.append(" how are you") ;
            s = s1;
     }

     public static void main ( String args[] ) {
             TestBuffer tb = new TestBuffer();
              StringBuffer s = new StringBuffer("Hello");
              StringBuffer s1 = new StringBuffer("doing");
              tb.myBuf(s, s1);
              System.out.print(s);
      }
}

A) Prints Hello how are you
B) Prints Hello
C) Prints Hello how are you doing
D) Compile time error

6) What is the result when you compile and run the following code?

public class MyTest {

   public void myTest( int[] increment ) {
          increment[1]++;
   }

   public static void main ( String args[] ) {
         int myArray[] = new int[1]; 
         MyTest mt = new MyTest();
         mt.myTest(myArray);
         System.out.println(myArray[1]);
   }
}

A) Compile time error
B) Runtime error
C) ArrayOutOfBoundsException
D) Prints 1 on the screen 

7) The following code has some errors, select all the correct answers from the following?

public class MyTest {

         public void myTest( int i ) {
                 for ( int x = 0; x < i; x++ ) {
                       System.out.println( x ) ;
                 }
          }
          public abstract void Test() {
                  myTest(10);
          }
}

A) At class declaration
B) myTest() method declaration
C) Test() method declaration
D) No errors, compiles successfully

8) At what point the following code shows compile time error?

class A {
         A() {
              System.out.println("Class A constructor");
          }
}

class B extends A {
         B() {
              System.out.println("Class B constructor");
          }
}

public class C extends A {
         C() {
              System.out.println("Class C constructor");
          }

         public static void main ( String args[] ) {
                 A a = new A(); // Line 1
                 A a1 = new B(); // Line 2
                 A a2 = new C(); // Line 3
                 B b = new C(); // Line 4
          }
}

A) A a = new A(); // Line 1
B) A a1 = new B(); // Line 2
C) A a2 = new C(); // Line 3
D) B b = new C(); // Line 4

9. This piece of code:

TextArea ta =new TextArea( 10, 3 );

Produces (select all correct statements):

a) a TextArea with 10 rows and up to 3 columns
b) a TextArea with a variable number of columns not less than 10 and 3 rows
c) a TextArea that may not contain more than 30 characters
d) a TextArea that can be edited

10. Of the five Component methods listed below, only one is also a method of the class MenuItem. Which one?

a) setVisible( boolean b )
b) setEnabled( boolean b )
c) getSize()
d) setForeground( Color c )
e) setBackground( Color c )

11 The layout of a container can be altered using which of the following methods:

1. setLayout(aLayoutManager);
2. addLayout(aLayoutManager);
3. layout(aLayoutManager);
4. setLayoutManager(aLayoutManager);

12. Given that a Button can generate an ActionEvent which listener would you expect to have to implement, in a class which would handle this event?

1. FocusListener
2. ComponentListener
3. WindowListener
4. ActionListener
5. ItemListener

13. Assuming we have a class which implements the ActionListener interface, which method should be used to register this with a Button?

1. addListener(*);
2. addActionListener(*);
3. addButtonListener(*);
4. setListener(*);

14. What are Wrapper Classes?

15. Which containers use a FlowLayout as their default layout?

16. Which is the super class of all event classes?