Dan Chisholm's
Java Programmer Certification Mock Exam

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I would also like to read your response to the following questions.

Question 1

class EBH019 {
  public static void main (String args[]) {
    int i1 = 0xffffffff, i2 = i1 << 1;
    int i3 = i1 >> 1, i4 = i1 >>> 1;
    System.out.print(Integer.toHexString(i2) + ",");
    System.out.print(Integer.toHexString(i3) + ",");
    System.out.print(Integer.toHexString(i4));
}}

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

a. Prints: ffffffff,ffffffff,ffffffff
b. Prints: ffffffff,ffffffff,7fffffff
c. Prints: ffffffff,7fffffff,ffffffff
d. Prints: ffffffff,7ffffffe,7ffffffe
e. Prints: fffffffe,ffffffff,ffffffff
f. Prints: fffffffe,ffffffff,7fffffff
g. Prints: fffffffe,7fffffff,ffffffff
h. Prints: fffffffe,7fffffff,7fffffff
i. Run-time error
j. Compile-time error
k. None of the above

Question 2

class EBH011 {
  public static void main (String[] args) {
    float a = Float.POSITIVE_INFINITY;
    double b = Double.POSITIVE_INFINITY;
    double c = Double.NaN;
    System.out.print((a == b)+","+(c == c)+","+(c != c));
}}

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

a. Prints: false,false,false
b. Prints: false,false,true
c. Prints: false,true,false
d. Prints: false,true,true
e. Prints: true,false,false
f. Prints: true,false,true
g. Prints: true,true,false
h. Prints: true,true,true
i. Run-time error
j. Compile-time error
k. None of the above

Question 3

class EBH012 {
  public static void main (String[] args) {
    byte x = 3, y = 5;
    System.out.print((-x == ~x + 1)+","+(-y == ~y + 1));
}}

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

a. Prints: false,false
b. Prints: false,true
c. Prints: true,false
d. Prints: true,true
e. Run-time error
f. Compile-time error
g. None of the above

Question 4

class EBH013 {
  public static void main (String[] args) {
    byte x = 3, y = 5;
    System.out.print((~x == -x - 1)+","+(~y == -y - 1));
}}

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

a. Prints: false,false
b. Prints: false,true
c. Prints: true,false
d. Prints: true,true
e. Run-time error
f. Compile-time error
g. None of the above

Question 5

class EBH014 {
  public static void main (String[] args) {
    byte x = 3, y = 5;
    System.out.print((y % x) + ",");
    System.out.print(y == ((y/x)*x + (y%x)));
}}

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

a. Prints: 1,true
b. Prints: 2,true
c. Prints: 1,false
d. Prints: 2,false
e. Run-time error
f. Compile-time error
g. None of the above

Question 6

class Color {}
class Red extends Color {}
class Blue extends Color {}
class A {
  public static void main (String[] args) {
    Color color1 = new Red(); Red color2 = new Red();
    boolean b1 = color1 instanceof Color;
    boolean b2 = color1 instanceof Blue;
    boolean b3 = color2 instanceof Blue;
    System.out.print(b1+","+b2+","+b3);
}}

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

a. false,false,false
b. false,false,true
c. false,true,false
d. false,true,true
e. true,false,false
f. true,false,true
g. true,true,false
h. true,true,true
i. Run-time error
j. Compile-time error
k. None of the above

Question 7

class EBH020 {
  public static void main (String[] args) {
    int a = 1 | 2 ^ 3 & 5;
    int b = ((1 | 2) ^ 3) & 5;
    int c = 1 | (2 ^ (3 & 5));
    System.out.print(a + "," + b + "," + c);
}}

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

a. Prints: 0,0,0
b. Prints: 0,0,3
c. Prints: 0,3,0
d. Prints: 0,3,3
e. Prints: 3,0,0
f. Prints: 3,0,3
g. Prints: 3,3,0
h. Prints: 3,3,3
i. Run-time error
j. Compile-time error
k. None of the above

Question 8

class EBH025 {
  public static void main (String args[]) {
    int i1 = 0xffffffff, i2 = i1 << 33;
    int i3 = i1 << (33 & 0x1f);
    System.out.print(Integer.toHexString(i2) + ",");
    System.out.print(Integer.toHexString(i3));
}}

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

a. Prints: 0,0
b. Prints: 0,fffffffe
c. Prints: 0,ffffffff
d. Prints: ffffffff,ffffffff
e. Prints: ffffffff,fffffffe
f. Prints: fffffffe,ffffffff
g. Prints: fffffffe,fffffffe
h. Run-time error
i. Compile-time error
j. None of the above

Question 9

class EBH001 {
  static int m(int i) {System.out.print(i + ", "); return i;}
  public static void main(String s[]) {
    m(m(1) - m(2) + m(3) * m(4));
}}

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

a. Prints: 1, 2, 3, 4, 8,
b. Prints: 1, 2, 3, 4, 11,
c. Prints: 3, 4, 1, 2, 11,
d. Run-time error
e. Compile-time error
f. None of the above

Question 10

class EBH002 {
  static int m(int i) {System.out.print(i + ", "); return i;}
  public static void main(String s[]) {
    m(m(1) + m(2) % m(3) * m(4));
}}

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

a. Prints: 1, 2, 3, 4, 0,
b. Prints: 1, 2, 3, 4, 3,
c. Prints: 1, 2, 3, 4, 9,
d. Prints: 1, 2, 3, 4, 12,
e. Prints: 2, 3, 4, 1, 9,
f. Prints: 2, 3, 4, 1, 3,
g. Run-time error
h. Compile-time error
i. None of the above

Question 11

class EBH005 {
  public static void main (String[] s) {
    byte b = 127; b <<= 2;System.out.println(b);
}}

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

a. Prints: -4
b. Prints: -3
c. Prints: -2
d. Prints: 0
e. Prints: 1
f. Prints: 127
g. Prints: 508
h. Run-time error
i. Compile-time error
j. None of the above

Question 12

class EBH007{
  public static void main (String[] s) {
    byte b = 5; System.out.println(b<<33);
}}

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

a. Prints: -1
b. Prints: 0
c. Prints: 1
d. Prints: 5
e. Prints: 10
f. Run-time error
g. Compile-time error
h. None of the above

Question 13

class EBH015 {
  public static void main (String[] args) {
    System.out.print((new Object() instanceof Object)+",");
    System.out.print((new Object() instanceof String)+",");
    System.out.print((new String() instanceof Object));
}}

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

a. Prints: false,false,false
b. Prints: false,false,true
c. Prints: false,true,false
d. Prints: false,true,true
e. Prints: true,false,false
f. Prints: true,false,true
g. Prints: true,true,false
h. Prints: true,true,true
i. Run-time error
j. Compile-time error
k. None of the above

Question 14

class EBH023 {
  static String m1(boolean b){return b?"T":"F";}
  public static void main(String [] args) {
    boolean b1 = false?false:true?false:true?false:true;
    boolean b2 = false?false:(true?false:(true?false:true));
    boolean b3 = ((false?false:true)?false:true)?false:true;
    System.out.println(m1(b1) + m1(b2) + m1(b3));
}}

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

a. Prints: FFF
b. Prints: FFT
c. Prints: FTF
d. Prints: FTT
e. Prints: TFF
f. Prints: TFT
g. Prints: TTF
h. Prints: TTT
i. Run-time error
j. Compile-time error
k. None of the above

Question 15

class EBH024 {
  public static void main(String[] args) {
    int i1 = 15;
    String b1 = (i1>30)?"Red":(i1>20)?"Green":(i1>10)?"Blue":"Violet";
    String b2 = (i1>30)?"Red":((i1>20)?"Green":((i1>10)?"Blue":"Violet"));
    System.out.println(b1 + "," + b2);

}}

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

a. Prints: Red,Red
b. Prints: Green,Green
c. Prints: Blue,Blue
d. Prints: Violet,Violet
e. Prints: Blue,Violet
f. Prints: Violet,Blue
g. Prints: Blue,Green
h. Prints: Green,Blue
i. Run-time error
j. Compile-time error
k. None of the above

Question 16

class EBH003 {
  static int m(int i) {System.out.print(i + ", "); return i;}
  public static void main(String s[]) {
    m(m(~1) + m(1|2) + m(1&2) + m(1^3) + m(1<<1));
}}

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

a. Prints: -2, 3, 0, 3, 0, 6,
b. Prints: -2, 3, 0, 2, 1, 4,
c. Prints: -2, 3, 0, 2, 2, 5,
d. Prints: -2, 3, 0, 3, 2, 6,
e. Prints: -1, 3, 0, 3, 2, 7,
f. Prints: -2, 0, 3, 3, 0, 6,
g. Prints: -1, 0, 3, 2, 1, 4,
h. Prints: -2, 0, 3, 2, 2, 5,
i. Prints: -2, 0, 3, 3, 2, 6,
j. Prints: -1, 0, 3, 3, 2, 7,
k. Run-time error
l. Compile-time error
m. None of the above

Question 17

class EBH021 {
  public static void main(String[] args) {
    System.out.print((-1 & 0x1f) + "," + (8 << -1));
}}

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

a. Prints: 0,0
b. Prints: -1,4
c. Prints: 0x1f,8
d. Prints: 31,16
e. Run-time error
f. Compile-time error
g. None of the above
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