Certified Java Programmer Mock Exam

Question 1

public class Basics {}      // 1
class Basics1 {}            // 2
protected class Basics2 {}  // 3
private class Basics3 {}    // 4
Class Basics4 {}            // 5

Suppose these are top-level class declarations and not nested class declarations; and suppose that all of the declarations are contained in one file named Basics.java. Compile-time errors are generated at which lines?

Question 2

public class Basics {}   // 1
public class Basics2 {}  // 2
public class Basics3 {}  // 3
public class Basics4 {}  // 4

Suppose these are top-level class declarations and not nested class declarations; and suppose that all of the declarations are contained in one file named Basics.java. A compile-time error is not generated at which line?

Question 3

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

Question 4

Which of the following modifiers can not be used with the abstract modifier in a method declaration?

Question 5

class JSC203 {
  static int m1(byte b) {return b;}   // 1
  static int m2(char c) {return c;}   // 2
  static int m3(long l) {return l;}   // 3
  public static void main(String[] args) {
    byte b = 1; char c = '\u0002'; long l = 4L;
    System.out.print(""+m1(b)+m2(c)+m3(l));
}}

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

Question 6

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

Which of the following statements are true?

Question 7

Which of the following statements are true?

Question 8

// Class A is declared in a file named A.java.
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 C is declared in a file named C.java.
package com.dan.chisholm.other;
import com.dan.chisholm.A;
public class C extends A {
  public static void main(String[] args) {
    C c = new C();
    c.m1();  // 1
    c.m2();  // 2
    c.m3();  // 3
    c.m4();  // 4
}}

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

Question 9

class MWC104 {
  public static void main(String[] args) {
    int[5] a1;  // 1
    int []a2;   // 2
    int[   ]a3; // 3
    int a4[];   // 4
}}

A compile-time error is generated at which line?

Question 10

Which of the following statements are true?

Question 11

Which of the following statements is true?

Question 12

class JSC204 {
  static int m1(short s)  {return s;}   // 1
  static int m2(float f) {return f;}    // 2
  public static void main(String[] args) {
    short s = 3; float f = 5.0f;
    System.out.print(""+m1(s)+m2(f));
}}

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

Question 13

Suppose that the compiler generates a default constructor for a class. If a compile-time error is to be avoided, which of the following must be true?

Question 14

class JSC101 {
  void m1() {
    public int a;      // 1
    protected int b;   // 2
    private int c;     // 3
    static int d;      // 4
    transient int e;   // 5
    volatile int f;    // 6
    final int g = 1;   // 7
}}

Compile-time errors are generated at which lines?

Question 15

Which of the following statements is not true?

Question 16

class JSC205 {
  static int m1(int i) {return i;}     // 1
  static void m2(int i) {return i;}    // 2
  static int m3(int i) {return;}       // 3
  public static void main(String[] args) {
    System.out.print(""+m1(1)+m2(2)+m3(3)); // 4
}}

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

Question 17

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

Which of the following statements is true?

Question 18

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?

Question 19

class MWC105 {
  static boolean b1;
  public static void main(String[] args) {
    boolean[] array = new boolean[1];
    boolean b2;
    System.out.print(b1+",");
    System.out.print(array[0]+",");
    System.out.print(b2);
}}

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

Question 20

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?