1.Which statement from s1 to s6 (see below) cause compilationerror? Assumethestatementthatcauses compilation is deleted, what is the output when the program is executed?

class X{ } void f1() { System.out.println("XXX"); }

class Y extends X{

void f1() { System.out.println("YYY"); } }

class Z extends X{

void f1() { System.out.println("ZZZ"); } }

class Test{

static void g(X a)

{ a.f1(); }

public static void main(String args[]){

Y y = new Y(); //s1

g(y); //s2

Object obj = new Y(); //s3

obj.f1(); //s4

X x = new Z(); //s5

x.f1(); //s6

}

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2. Which of the following 10 statements (see ** ) cause compilation or runtime errors

class X{}

class Y extends X{}

class Z extends X{}

class Test{

public static void main(String args[])

{ X x = new X(); Y y = new Y(); Z z = new Z();

Object obj1 = new Y();

Object obj2 = new X();

//**The below 10 statements creating

// references o1, o2, ..., o10

X o1 = new Y(); Xo2 =z; Y o3 = new Z(); Y o4 = (Y) x;

Y o5 = (Y) obj1; Z o6 = z; Z o7 = (Z) y; Z o8 = (X) y; Object o9 = y; Object o10 = (X) obj1;

}

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3. Answer questions (i), (ii) and (iii) below:

classA {

// data/fields

int a; public int b;

private int c;

protected int d;

static private int e;

static public int f;

final int g=5;

// methods

void f1() { /* statements */ } public void f2() { /* statements */ }

protected void f3() { /* statements */ }

private void f4() { /* statements */ }

static public void f5() { /* statements */ }

final void f6(){ /* statements */ }

void f7() { /* (i): list all fields/methods in class A

that can be directly accessed here */

}

static void f8() { /* (ii): list all fields/methods in class A

} that can be directly accessed here*/

}

class B { public static void main(String[] argv)

{

AobjA=newA();

/* (iii): : list all fields/methods in class A

thatcanbeaccessedusingobjA*/

}

}

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4. What is the output from the following program? Note: if an exception is not handled, then the

program is terminated immediately.

class Test {

static void f1() { throw new RuntimeException("hello"); }

static void f2()

{ try

{ f1(); } catch (Exception e) { System.out.println("FFF"); }

finally { System.out.println("GGG"); }

f1(); System.out.println("HHH");

}

public static void main(String[] argv)

{ try

{ f2();

f1(); }

catch (Exception e) { System.out.println("AAA"); }

try

{ f1(); } catch (Exception e) { System.out.println("BBB"); }

finally { System.out.println("CCC"); }

System.out.println("DDD");

f2(); System.out.println("EEE");

f1();

}} // END class Test

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5. Implement replace method in linked list that replaces a given findObject by a given replaceObject

in a bag. Return false if findObject cannot be found. The header of the method is as follows:

public boolean replace(T findObject, T replaceObject)

Note: You may assume that fisrtNode is a private data in list which references to first node.

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6. Assume that you have the following Bag object,

myBag, with n String data :

BagInterface myBag=

new ArrayBag();

Write Java statements that create a newBag object which contains non-duplicate data in myBag.

Example: if myBag contains data: hello, Hello, world, hello, james, james

newBag object should contain : hello, Hello, world, james

Hint: Use the following Bags methods :

int getCurrentSize ();

boolean isFull (); boolean isEmpty ();

boolean add (T newEntry); T remove (); boolean remove (T anEntry);

void clear (); int getFrequencyOf (T anEntry);

boolean contains (T anEntry);

T [] toArray ();