Certified Java Programmer Mock Exam

Question 1

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?

a.	Prints: 0,255
b.	Prints: 0,256
c.	Prints: -127,128
d.	Prints: -128,127
e.	Compile-time error
f.	Run-time error
g.	None of the above

Question 2

class JJF2 {
  public static void main (String args[]) {
    System.out.print(Short.MIN_VALUE+",");
    System.out.print(Short.MAX_VALUE);
}}

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

a.	Prints: -32767,32768
b.	Prints: -32768,32767
c.	Prints: 0,65535
d.	Prints: 0,65536
e.	Compile-time error
f.	Run-time error
g.	None of the above

Question 3

class JJF3 {
  public static void main(String args[]) {
    System.out.print(Integer.toBinaryString(Byte.MAX_VALUE)+",");
    System.out.print(Integer.toOctalString(Byte.MAX_VALUE)+",");
    System.out.print(Integer.toString(Byte.MAX_VALUE)+",");
    System.out.print(Integer.toHexString(Byte.MAX_VALUE));
}}

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

a.	Prints: 1111111,177,127,7f
b.	Prints: 11111111,377,256,ff
c.	Compile-time error
d.	Run-time error
e.	None of the above

Question 4

class JJF4 {
  public static void main(String args[]) {
    System.out.print(Long.toHexString(Byte.MAX_VALUE)+",");
    System.out.print(Long.toHexString(Character.MAX_VALUE)+",");
    System.out.print(Long.toHexString(Short.MAX_VALUE));
}}

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

a.	Prints: f,ff,7f
b.	Prints: f,ff,ff
c.	Prints: 7f,ffff,7fff
d.	Prints: ff,ffff,ffff
e.	Prints: 7fff,ffffff,7fffff
f.	Prints: ffff,ffffff,ffffff
g.	Compile-time error
h.	Run-time error
i.	None of the above

Question 5

class JJF5 {
  public static void main(String args[]) {
    System.out.print(Integer.toHexString(Integer.MIN_VALUE)+",");
    System.out.print(Integer.toHexString(Integer.MAX_VALUE));
}}

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

a.	Prints: 0000,ffff
b.	Prints: 00000000,ffffffff
c.	Prints: 7fff,8000
d.	Prints: 8000,7fff
e.	Prints: 7fffffff,80000000
f.	Prints: 80000000,7fffffff
g.	Compile-time error
h.	Run-time error
i.	None of the above

Question 6

Which of the following represent the full range of type char?

a.	'\u0000' to '\u7fff'
b.	'\u0000' to '\uffff'
c.	0 to 32767
d.	0 to 65535
e.	-32768 to 32767
f.	-65536 to 65535

Question 7

Which of the following represent the full range of type char?

a.	-0x8000 to 0x7fff
b.	0x0000 to 0xffff
c.	-0100000 to 077777
d.	0 to 0177777
e.	0 to 32767
f.	0 to 65535
g.	-32768 to 32767

Question 8

class JJF6 {
  char c1 = 0xffff;  // 1
  char c2 = 0xfffff; // 2
  byte b1 = 0xffff;  // 3
  byte b2 = 0x7f;    // 4
  byte b3 = 0xff;    // 5
  byte b4 = -0x80;   // 6
}

Compile-time errors are generated at which lines?

a.	1
b.	2
c.	3
d.	4
e.	5
f.	6