Java Programmer Certification Mock Exam

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Question 1


class A {void m1(A a) {System.out.print("A");}}
class B extends A {void m1(B b) {System.out.print("B");}}
class C extends B {void m1(C c) {System.out.print("C");}}
class D extends C {
  void m1(D d) {System.out.print("D");}
  public static void main(String[] args) {
    A a1 = new A(); B b1 = new B(); C c1 = new C(); D d1 = new D();
    d1.m1(a1); d1.m1(b1); d1.m1(c1);
}}

What is the result of attempting to compile and run the program?

a.	Prints: AAA
b.	Prints: ABC
c.	Prints: DDD
d.	Prints: ABCD
e.	Compile-time error
f.	Run-time error
g.	None of the above

Question 2

class A {}  class B extends A {}  class C extends B {}
class D {
  void m1(A a) {System.out.print("A");}
  void m1(B b) {System.out.print("B");}
  void m1(C c) {System.out.print("C");}
  public static void main(String[] args) {
    A c1 = new C(); B c2 = new C(); C c3 = new C(); D d1 = new D();
    d1.m1(c1); d1.m1(c2); d1.m1(c3);
}}

What is the result of attempting to compile and run the program?

a.	Prints: AAA
b.	Prints: ABC
c.	Prints: CCC
d.	Compile-time error
e.	Run-time error
f.	None of the above

Question 3

class A {void m1(A a) {System.out.print("A");}}
class B extends A {void m1(B b) {System.out.print("B");}}
class C extends B {void m1(C c) {System.out.print("C");}}
class D {
  public static void main(String[] args) {
    A c1 = new C(); B c2 = new C(); C c3 = new C(); C c4 = new C();
    c4.m1(c1); c4.m1(c2); c4.m1(c3);
}}

What is the result of attempting to compile and run the program?

a.	Prints: AAA
b.	Prints: ABC
c.	Prints: CCC
d.	Compile-time error
e.	Run-time error
f.	None of the above

Question 4

class A {void m1(A a) {System.out.print("A");}}
class B extends A {void m1(B b) {System.out.print("B");}}
class C extends B {void m1(C c) {System.out.print("C");}}
class D {
  public static void main(String[] args) {
    A c1 = new C(); C c2 = new C(); c1.m1(c2);
}}

What is the result of attempting to compile and run the program?

a.	Prints: A
b.	Prints: B
c.	Prints: C
d.	Compile-time error
e.	Run-time error
f.	None of the above

Question 5

class A {void m1(A a) {System.out.print("A");}}
class B extends A {void m1(B b) {System.out.print("B");}}
class C extends B {void m1(C c) {System.out.print("C");}}
class D {
  public static void main(String[] args) {
    A a1 = new A(); A b1 = new B(); A c1 = new C(); C c4 = new C();
    a1.m1(c4); b1.m1(c4); c1.m1(c4);
}}

What is the result of attempting to compile and run the program?

a.	Prints: AAA
b.	Prints: ABC
c.	Prints: CCC
d.	Compile-time error
e.	Run-time error
f.	None of the above

Question 6

class A {void m1(A a) {System.out.print("A");}}
class B extends A {void m1(B b) {System.out.print("B");}}
class C extends B {void m1(C c) {System.out.print("C");}}
class D {
  public static void main(String[] args) {
    A a1 = new A(); B b1 = new B(); C c1 = new C(); A c2 = new C();
    c2.m1(a1); c2.m1(b1); c2.m1(c1);
}}

What is the result of attempting to compile and run the program?

a.	Prints: AAA
b.	Prints: ABC
c.	Prints: CCC
d.	Compile-time error
e.	Run-time error
f.	None of the above

Question 7

class A {void m1(A a) {System.out.print("A");}}
class B extends A {void m1(B b) {System.out.print("B");}}
class C extends B {void m1(C c) {System.out.print("C");}}
class D {
  public static void main(String[] args) {
    A a1 = new A(); B b1 = new A(); C c1 = new A(); C c2 = new C();
    c2.m1(a1); c2.m1(b1); c2.m1(c1);
}}

What is the result of attempting to compile and run the program?

a.	Prints: AAA
b.	Prints: ABC
c.	Prints: CCC
d.	Compile-time error
e.	Run-time error
f.	None of the above

Question 8

class A {void m1(A a) {System.out.print("A");}}
class B extends A {void m1(B b) {System.out.print("B");}}
class C extends B {void m1(C c) {System.out.print("C");}}
class D {
  public static void main(String[] args) {
    A a1 = new A(); B b1 = new B(); C c1 = new C(); C c2 = new A();
    c2.m1(a1); c2.m1(b1); c2.m1(c1);
}}

What is the result of attempting to compile and run the program?

a.	Prints: AAA
b.	Prints: ABC
c.	Prints: CCC
d.	Compile-time error
e.	Run-time error
f.	None of the above

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