Certified Java Programmer Mock Exam

Question 1

class A {
  public static void main(String[] args) {
    char a = 'a'; // 'a' = 97
    char b = 'b'; // 'b' = 98
    System.out.print(a + b + "" + a + b);
  }
}

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

Question 2

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

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

Question 3

class A {
  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
  }
}

What is the result of attempting to compile the program?

Question 4

class N {
  public static void main (String[] s) {
    byte b = 5;
    System.out.println(b<<32);
  }
}

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

Question 5

class J {
  public static void main (String[] s) {
    byte b = 0;
    b += ~b >>> 1;
    System.out.println(b);
  }
}

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

Question 6

class L {
  static String m(float i) {return "float";}
  static String m(double i) {return "double";}
  public static void main (String[] args) {
    char a = 1;
    long b = 2;
    System.out.print(m(a)+","+ m(b));
  }
}

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

Question 7

class Blue {
  public static void main (String[] args) {
    int i1 = (Integer.MAX_VALUE + 2);
    int i2 = (Integer.MIN_VALUE + 1);
    int i3 = (Integer.MIN_VALUE + 2);
    int i4 = (Integer.MIN_VALUE + 3);
    System.out.println((i1==i2)+","+(i1 ==i3)+","+(i1 ==i4));
  }
}

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

Question 8

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

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

Question 9

1. class Green {
2.   public static void main (String args[]) {
3.     int[] i = null;
4.     Cloneable c = i;
5.     i = (int [])c;
6.   }
7. }

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

Question 10

class Fuchsia {
  public static void main (String[] args) {
    System.out.println((short)Integer.MIN_VALUE +
      ", " + (short)Integer.MAX_VALUE +
      ", " + (int)(char)Integer.MIN_VALUE  +
      ", " + (int)(char)Integer.MAX_VALUE);
  }
}

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

Question 11

class A {
  static int m(int i) {
    System.out.print(i + ",");
    return 0;
  }
  public static void main (String[] args) {
    int i = 0;
    i = i++ + m(i);
    System.out.print(i);
  }
}

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

Question 12

class M {
  static int m(int i) {
    System.out.print(i + ", ");
    return i;
  }

  public static void main(String s[]) {
    int i = 1;
    int j = m(i++) + m(i++) * m(i++) + m(i++);
    System.out.print(j % 5);
  }
}

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

Question 13

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 the program?

Question 14

class A {}
class B extends A {}
class C {
  void m(A x) {System.out.print("A");}
  void m(B x) {System.out.print("B");}
  public static void main(String[] args) {
    C c = new C();
    c.m(null);
  }
}

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

Question 15

class L {
  static String m(int i) {return "int";}
  static String m(float i) {return "float";}
  public static void main (String[] args) {
    long a = 1;
    double b = 2;
    System.out.print(m(a)+","+ m(b));
  }
}

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

Question 16

1.  class Teal {
2.    public static void main (String[] args) {
3.      byte b=1;
4.      long l=1000;
5.      b += l;
6.    }
7.  }

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

Question 17

class R {
  static int m(int i) {
    System.out.print(i + ", ");
    return i;
  }
  public static void main(String s[]) {
    m(m(~1) + m(1|2) + m(1&2) + m(1^3) + m(1<<1));
  }
}

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