Certified Java Programmer Mock Exam

Question 1

class E {
  public static void main (String args[]) {
    int i1 = 0xffffffff;
    int i2 = i1 << 1;
    int i3 = i1 >> 1;
    int 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 above program?

Question 2

class D {
  public static void main (String args[]) {
    int i1 = ~1;
    int i2 = -1;
    int i3 = -2;
    System.out.print(Integer.toHexString(i1) + ",");
    System.out.print(Integer.toHexString(i2) + ",");
    System.out.print(Integer.toHexString(i3));
  }
}

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

Question 3

class V {
  public static void main (String[] args) {
    System.out.print((0.0 % -1)+","+(-0.0 % 1)+","+(-0.0 % -1));
  }
}

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

Question 4

class Color {}
class Red extends Color {}
class Blue extends Color {}
class A {
  public static void main (String[] args) {
    Color c1 = new Red();
    Color c2 = new Blue();
    Red r1 = new Red();
    boolean b1 = c1 instanceof Color;
    boolean b2 = c1 instanceof Blue;
    boolean b3 = r1 instanceof Blue;
    System.out.print(b1+","+b2+","+b3);
  }
}

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

Question 5

class W {
  public static void main (String[] args) {
    byte x = 3;
    byte y = 5;
    System.out.print((-x == ~x + 1)+","+(-y == ~y + 1));
  }
}

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

Question 6

class A {
  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 above program?

Question 7

class V {
  public static void main (String[] args) {
    System.out.print(Float.NaN % 2 + ",");
    System.out.print(2 % Float.NaN);
  }
}

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

Question 8

class L {
  public static void main (String s[]) {
    int i = 1 | 2 ^ 15 & 7 ^ 13 | 2;
    System.out.println(i % 5);
  }
}

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

Question 9

class Chartreuse {
  public static void main (String[] args) {
    short i = (short)Float.NEGATIVE_INFINITY;
    short j = (short)Float.POSITIVE_INFINITY;
    short k = (short)Float.NaN;
    System.out.println((i == Short.MIN_VALUE) +
      ", " + (j == Short.MAX_VALUE) +
      ", " + (k == 0));
  }
}

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

Question 10

class B {
  static boolean m(boolean b) {
    System.out.print(b + " ");
    return b;
  }
  public static void main(String[] args) {
    boolean a = false;
    boolean b = false;
    boolean c = true;
    boolean d = false;

    m(m(a | b == c & d) == m((a | b) == (c & d)));
  }
}

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

Question 11

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");}
  static void m(A x, C y) {System.out.print("AC");}
  public static void main(String[] args) {
    C c = new C();
    m(c, c);
  }
}

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

Question 12

class A {
  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 above program?

Question 13

1.  class Primitives {
2.    static void printFloat(float f) {System.out.println(f);}
3.    static void printDouble(double d) {System.out.println(d);}
4.    public static void main(String[] args) {
5.      byte b = 1;
6.      short s = b;
7.      char c = s;
8.      int i = c;
9.      long l = i;
10.     float f = l;
11.     printFloat(i);
12.     printFloat(l);
13.     printDouble(l);
14.   }
15. }

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

Question 14

class P{
  public static void main (String[] s) {
    byte b = 5;
    System.out.println(b<<33);
  }
}

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

Question 15

class L {
  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 above program?

Question 16

class K {
  public static void main (String[] s) {
    byte b = 127;
    b <<= 2;
    System.out.println(b);
  }
}

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

Question 17

class M {
  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 above program?