Dan Chisholm's
Java Programmer Certification Mock Exam

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Question 1

class MWC201 {
  public static void main(String[] args) {
    int[][] a1 = {{1,2,3},{4,5,6},{7,8,9,10}};
    System.out.print(a1[0][2]+","+a1[1][0]+","+a1[2][1]);
}}

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

a. Prints: 3,4,8
b. Prints: 7,2,6
c. Compile-time error
d. Run-time error
e. None of the above

Question 2

class MWC202 {
  public static void main(String[] args) {
    int[] a1[] = {{1,2},{3,4,5},{6,7,8,9}};
    int []a2[] = {{1,2},{3,4,5},{6,7,8,9}};
    int a3[][] = {{1,2},{3,4,5},{6,7,8,9}};
    System.out.print(a1[0][1]+","+a2[1][2]+","+a3[2][3]);
}}

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

a. Prints: 14
b. Prints: 16
c. Prints: 1,5,9
d. Prints: 2,4,8
e. Prints: 2,5,9
f. Compile-time error
g. Run-time error
h. None of the above

Question 3

class MWC207 {
  public static void main(String[] args) {
    int[][] a1 = {{1;2};{3;4;5};{6;7;8;9}};
    System.out.print(a1[0][1]+","+a1[1][2]+","+a1[2][3]);
}}

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

a. Prints: 14
b. Prints: 16
c. Prints: 1,5,9
d. Prints: 2,4,8
e. Prints: 2,5,9
f. Compile-time error
g. Run-time error
h. None of the above

Question 4

class MWC208 {
  public static void main(String[] args) {
    int[][] a1 = ((1,2),(3,4,5),(6,7,8,9));
    System.out.print(a1[0][1]+","+a1[1][2]+","+a1[2][3]);
}}

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

a. Prints: 14
b. Prints: 16
c. Prints: 1,5,9
d. Prints: 2,4,8
e. Prints: 2,5,9
f. Compile-time error
g. Run-time error
h. None of the above

Question 5

class MWC209 {
  public static void main(String[] args) {
    int[][] a1 = [[1,2],[3,4,5],[6,7,8,9]];
    int[][] a2 = [[1,2],[3,4,5],[6,7,8,9]];
    int[][] a3 = [[1,2],[3,4,5],[6,7,8,9]];
    System.out.print(a1[0][1]+","+a2[1][2]+","+a3[2][3]);
}}

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

a. Prints: 14
b. Prints: 16
c. Prints: 1,5,9
d. Prints: 2,4,8
e. Prints: 2,5,9
f. Compile-time error
g. Run-time error
h. None of the above

Question 6

class MWC210 {
  public static void main(String[] args) {
    int[] a2 = {1,2}, a3 = {3,4,5}, a4 = {6,7,8,9}; // 1
    int[][] a1 = {a2,a3,a4};                        // 2
    System.out.print(a1[0][1]+","+a1[1][2]+","+a1[2][3]);
}}

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

a. Prints: 14
b. Prints: 16
c. Prints: 1,5,9
d. Prints: 2,4,8
e. Prints: 2,5,9
f. Compile-time error
g. Run-time error
h. None of the above

Question 7

class MWC211 {
  public static void main(String[] args) {
    int a1[3];    // 1
    int []a2[];   // 2
    int[   ]a3;   // 3
    int[] a4[];   // 4
}}

A compile-time error is generated at which line?

a. 1
b. 2
c. 3
d. 4
e. None of the above

Question 8

class MWC212 {
  public static void main(String[] args) {
    int[] a1[],a2[];  // 1
    int []a3,[]a4;    // 2
    int []a5,a6[];    // 3
    int[] a7,a8[];    // 4
}}

A compile-time error is generated at which line?

a. 1
b. 2
c. 3
d. 4
e. None of the above

Question 9

class MWC203 {
  public static void main(String[] args) {
    int[] a1[] = {new int[]{1,2},new int[]{3,4,5}};
    int []a2[] = new int[][]{{1,2},{3,4,5}};
    int a3[][] = {{1,2},new int[]{3,4,5}};
    System.out.print(a1[0][1]+","+a2[1][0]+","+a3[1][2]);
}}

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

a. Prints: 14
b. Prints: 16
c. Prints: 1,2,4
d. Prints: 2,3,4
e. Prints: 2,3,5
f. Prints: 2,4,5
g. Compile-time error
h. Run-time error
i. None of the above

Question 10

class MWC204 {
  public static void main(String[] args) {
    int[][] a1 = {{1,2},{3,4,5},{6,7,8,9},{}};
    System.out.print(a1.length);
}}

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

a. Prints: 0
b. Prints: 3
c. Prints: 4
d. Prints: 9
e. Prints: 10
f. Prints: 11
g. Compile-time error
h. Run-time error
i. None of the above

Question 11

class MWC205 {
  public static void main(String[] args) {
    int[][] a1 = {{1,2},{3,4,5},{6,7,8,9},{}};
    for (int i = 0; i < a1.length; i++) {
      System.out.print(a1[i].length+",");
}}}

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

a. Prints: 2,3,4,0,
b. Prints: 1,2,5,0,
c. Compile-time error
d. Run-time error
e. None of the above

Question 12

class MWC206 {
  public static void main (String[] args) {
    int[][] a1 = {{1,2,3},{4,5,6},{7,8,9}};
    for (int i = 0; i < 3; i++) {
      for (int j = 0; j < 3; j++) {
        System.out.print(a1[j][i]);
}}}}

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

a. Prints: 123456789
b. Prints: 147258369
c. Prints: 321654987
d. Prints: 369258147
e. Run-time error
f. Compile-time error
g. None of the above

Question 13

class A11 {public String toString() {return "A11";}}
class A12 {
  public static void main(String[] arg) {
    A11[]     a1 = new A11[1];         // 1
    A11[][]   a2 = new A11[2][];       // 2
    A11[][][] a3 = new A11[3][][];     // 3
    a1[0] = new A11();                 // 4
    a2[0] = a2[1] = a1;                // 5
    a3[0] = a3[1] = a3[2] = a2;        // 6
    System.out.print(a3[2][1][0]);     // 7
}}

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

a. Prints: null
b. Prints: A11
c. Compile-time error at 1.
d. Compile-time error at 2.
e. Compile-time error at 3.
f. Compile-time error at 4.
g. Compile-time error at 5.
h. Compile-time error at 6.
i. Compile-time error at 7.
j. Run-time error
k. None of the above

Question 14


class A13 {}
class A14 {
  public static void main(String[] arg) {
    A13[]     a1 = new A13[1];         // 1
    A13[][]   a2 = new A13[2][1];      // 2
    A13[][][] a3 = new A13[3][3][3];   // 3
    System.out.print(a3[2][2][2]);     // 4
    a1[0] = new A13();                 // 5
    a2[0] = a2[1] = a1;                // 6
    a3[0] = a3[1] = a3[2] = a2;        // 7
    System.out.print(a3[2][2][2]);     // 8
}}

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

a. Prints: null
b. Prints: nullnull
c. Compile-time error at 1.
d. Compile-time error at 2.
e. Compile-time error at 3.
f. Compile-time error at 4.
g. Compile-time error at 5.
h. Compile-time error at 6.
i. Compile-time error at 7.
j. Compile-time error at 8.
k. Run-time error
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