Certified Java Programmer Mock Exam

Question 1

1.  class Red {
2.    // Comment1
3.    // // Comment2
4.    /* Comment3 */
5.    /* Comment4
6.    */
7.    /** Comment5 */
8.    // /* Comment6 */
9.    /* // Comment7 */
10.   /* /* Comment8 */
11.   /** /* // Comment9 // /* */
12.   /* Comment10 */*/
13.   /* Comment11 /* Comment12 */ */
14. }

What is the result of attempting to compile the program?

Question 2

class A {
  A() throws Exception {}  // 1
}
class B extends A {
  B() throws Exception {}  // 2
}
class C extends A {}       // 3

Which of the following statements are true?

Question 3

class G {
  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 above program?

Question 4

class I {
  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 above program?

Question 5

Which of the following modifiers can be applied to a class that is not a nested class?

Question 6

class B {
  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 above program?

Question 7

class A {
  public static void main(String[] args) {
    int[] a1 = new int[];              // 1
    int a2[] = new int[5];             // 2
    int[] a3 = new int[]{1,2};         // 3
    int []a4 = {1,2};                  // 4
    int[] a5 = new int[5]{1,2,3,4,5};  // 5
  }
}

Compile-time errors occur at which lines?

Question 8

Which of the following is used to prevent the serialization of a field?

Question 9

public class A {
  int i1;
  void m1() {}
}

Which of the following statements are true?

Question 10

class A {
  transient float e = 1;         // 1
  volatile float f  = 1;         // 2
  abstract float j = 1;          // 3
  final float g = 1;             // 4
  private final float k = 1;     // 5
  private transient float l = 1; // 6
  volatile final float m = 1;    // 7
}

Compile-time errors are generated at which lines?

Question 11

class A {
  public static void main(String[] args) {
    int[5] a1;  // 1
    int []a2;   // 2
    int[   ]a3; // 3
    int[] a4[]; // 4
  }
}

Compile-time errors occur at which lines?

Question 12

Which of the following techniques can be used to prevent the instantiation of a class by any code outside of the class?

Question 13

class H {
  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 above program?

Question 14

Which of the following statements are true?

Question 15

class C {
  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 above program?

Question 16

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

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

Question 17

class A {}
class B {
  public static void main(String[] arg) {
    A[]     a1 = new A[1];         // 1
    A[][]   a2 = new A[2][1];      // 2
    A[][][] a3 = new A[3][3][3];   // 3
    System.out.print(a3[2][2][2]); // 4
    a1[0] = new A();               // 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 above program?

Question 18

class A {
  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 above program?