Certified Java Programmer Mock Exam

Question 1

package com.dan.chisholm;
public class A {
  public void m1() {System.out.print("A.m1, ");}
  protected void m2() {System.out.print("A.m2, ");}
  private void m3() {System.out.print("A.m3, ");}
  void m4() {System.out.print("A.m4, ");}
}  
class B {
  public static void main(String[] args) {
    A a = new A();
    a.m1();  // 1
    a.m2();  // 2
    a.m3();  // 3
    a.m4();  // 4
}}

Assume that the code appears in a single file named A.java. What is the result of attempting to compile and run the program?

Question 2

class GFM11{
  public static void main (String[] args) {
    int x,y,z;
    System.out.println(x+y+z);
}}

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

Question 3

class GRC10 {
  public static void main (String[] s) {
    System.out.print(s[1] + s[2] + s[3]);
}}
java GRC10 A B C D E F

What is the result of attempting to compile and run the program using the specified command line?

Question 4

class MCZ11 {
  public static void main (String[] args) {
    char a = '\c';  // 1
    char b = '\r';  // 2
    char c = '\"';  // 3
    char d = '\b';  // 4
    char e = '\'';  // 5
}}

A compile-time error is generated at which line?

Question 5

class MWC101 {
  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 are generated at which lines?

Question 6

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?

Question 7

class A {A(int i) {}}  // 1
class B extends A {}   // 2

Which of the following statements are true?

Question 8

Which of the following statements are true?

Question 9

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

Which of the following statements are true?

Question 10

Which of the following modifiers can be applied to a constructor?

Question 11

Which of the following modifiers can be applied to the declaration of a field?

Question 12

Which of the following modifiers can not be applied to a method?

Question 13

class JSC201 {
  static byte m1() {
    final char c = '\u0001';
    return c;                               // 1
  }
  static byte m3(final char c) {return c;}  // 2
  public static void main(String[] args) {
    char c = '\u0003'; 
    System.out.print(""+m1()+m3(c));
}}

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

Question 14

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

Question 15

Which of the follow are true statements.

Question 16

class A {
  public static void main (String[] args) {
    Error error = new Error();
    Exception exception = new Exception();
    System.out.print((exception instanceof Throwable) + ",");
    System.out.print(error instanceof Throwable);
}}

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

Question 17

class B {
  private String name;
  public B(String s) {name = s;}
  public void finalize() {System.out.print(name);}
}
class E {
  public static void m() {
    B x1 = new B("X"), y1 = new B("Y");
  }
  public static void main(String[] args) {
    m(); System.gc();
}}

Which of the following could not be a result of attempting to compile and run the program?

Question 18

Which of the following statements is not true?

Question 19

class JJF1 {
  public static void main (String args[]) {
    System.out.print(Byte.MIN_VALUE+",");
    System.out.print(Byte.MAX_VALUE);
}}

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

Question 20

class GRC1 {public static void main(String[] args) {}}    // 1
class GRC2 {protected static void main(String[] args) {}} // 2
class GRC3 {private static void main(String[] args) {}}   // 3

What is the result of attempting to compile each of the three class declarations and invoke each main method from the command line?

Question 21

class EBH201 {
  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?

Question 22

class GFC100 {
  public static void main(String[] args) {
    final short s1 = 1; // 1
    final char c1 = 1;  // 2
    byte b1 = s1;       // 3
    byte b2 = c1;       // 4
    byte b3 = 1;        // 5
    byte b4 = 1L;       // 6
    byte b5 = 1.0;      // 7
    byte b6 = 1.0d;     // 8
}}

Compile-time errors are generated at which lines?

Question 23

Which of the following is a true statement?

Question 24

class A {
  void m1(int i) {
    int j = i % 3;
    switch (j) {
      case 0: System.out.print("0"); break;
      case 1: System.out.print("1"); break;
      default:
        assert j == 2;
        System.out.print(j);
  }}
  public static void main (String[] args) {
    A a = new A();
    for (int i=5; i >= -1; i--) {a.m1(i);}
}}

Which statements are true?

Question 25

Which of these words belong to the set of Java keywords?

Question 26

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?

Question 27

class JMM101 {
  public static void main(String[] args) {
    int i = 0;
    while (i++ < args.length) {
      System.out.print(args[i]);
}}}
java JMM101 A B C D E F

What is the result of attempting to compile and run the program using the specified command line?

Question 28

class EBH101 {
  static int m(int i) {
    System.out.print(i + ", ");
    return i;
  }
  public static void main(String s[]) {
    int i = 1;
    m(m(++i) + m(i++) + m(-i) + m(i++));
}}

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

Question 29

class Identifiers {
  int i1;   // 1
  int _i2;  // 2
  int i_3;  // 3
  int #i4;  // 4
  int $i5;  // 5
  int %i6;  // 6
  int i$7;  // 7
  int 8i;   // 8
}

Compile-time errors are generated at which lines?