Certified Java Programmer Mock Exam

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?

Question 2

class Black {
  public static void main(String[] args) {
    short s1 = 1;        //1
    char c1 = 1;         //2
    byte b1 = s1;        //3
    byte b2 = c1;        //4
    final short s2 = 1;  //5
    final char c2 = 1;   //6
    byte b3 = s2;        //7
    byte b4 = c2;        //8
}}

Compile-time errors are generated at which lines?

Question 3

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?

Question 4

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?

Question 5

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?

Question 6

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?

Question 7

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?

Question 8

class GFC205 {}
class GFC206 extends GFC205 {}
class GFC207 extends GFC206 {
  static void m(GFC205 x, GFC205 y) {System.out.print("GFC205,GFC205");}
  static void m(GFC205 x, GFC206 y) {System.out.print("GFC205,GFC206");}
  static void m(GFC206 x, GFC205 y) {System.out.print("GFC206,GFC205");}
  static void m(GFC206 x, GFC206 y) {System.out.print("GFC206,GFC206");}
  public static void main(String[] args) {
    GFC207 gfc207 = new GFC207();
    m(gfc207, gfc207);
}}

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

Question 9

class GFC211 {}
class GFC212 extends GFC211 {}
class GFC213 extends GFC212 {
  static void m(GFC211 x, GFC211 y) {System.out.print("GFC211,GFC211");}
  static void m(GFC211 x, GFC212 y) {System.out.print("GFC211,GFC212");}
  static void m(GFC212 x, GFC211 y) {System.out.print("GFC212,GFC211");}
  static void m(GFC212 x, GFC212 y) {System.out.print("GFC212,GFC212");}
  static void m(GFC211 x, GFC213 y) {System.out.print("GFC211,GFC213");}
  public static void main(String[] args) {
    GFC213 gfc213 = new GFC213();
    m(gfc213, gfc213);
}}

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

Question 10

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?

Question 11

class GFC214 {
  static void m1(boolean b1) {System.out.print("boolean ");}
  static void m1(byte b1) {System.out.print("byte ");}
  static void m1(short s1) {System.out.print("short ");}
  static void m1(char c1) {System.out.print("char ");}
  static void m1(int i1) {System.out.print("int ");}
  public static void main(String[] args) {
    byte b1; m1(b1 = 1); m1(b1); m1(b1 == 1);
}}

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

Question 12

class GFC308 {
  int[] i1 = {1}, i2 = {3};
  void m1() {
    m2(i1, i2);
    System.out.print(i1[0] + "," + i2[0]);
  }
  void m2(int[] i1, int[] i2) {
    int[] i3 = i1;
    this.i1 = i2;
    this.i2 = i3;
  }
  public static void main (String[] args) {
    new GFC308().m1();
}}

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

Question 13

class EBH108 {
  public static void main(String s[]) {
    int i=0;
    int j = ++i + ((++i * ++i) % ++i) + ++i;
    System.out.print(j%5);
}}

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

Question 14

class A {}
class B extends A {}
class C extends B {
  static void m(A x, A y) {System.out.print("AA");}
  static void m(A x, B y) {System.out.print("AB");}
  static void m(B x, A y) {System.out.print("BA");}
  static void m(B x, B y) {System.out.print("BB");}
  public static void main(String[] args) {
    A a1; B b1;
    m(null,null); m(a1=null,b1=null); m(b1, a1);
}}

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

Question 15

class A {}
class B extends A {}
class C extends B {
  static void m1(A x) {System.out.print("m1A");}
  static void m2(B x) {System.out.print("m2B"); m1(x);}
  static void m2(A x) {System.out.print("m2A"); m1(x);}
  static void m3(C x) {System.out.print("m3C"); m2(x);}
  static void m3(B x) {System.out.print("m3B"); m2(x);}
  static void m3(A x) {System.out.print("m3A"); m2(x);}
  public static void main(String[] args) {
    m3(new C());
}}

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

Question 16

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?

Question 17

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?

Question 18

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?