Key FE PRO192 Study Guide Exam with Actual Detailed Solutions Updated.

Key FE PRO192 Study Guide Exam
with Actual Detailed Solutions 2025-
2026 Updated.
which these is correct way of inheriting class A by class B?

A. class B extends class A{}

B. class B + class A{}

C. class B inherits class A{}

D. Class B extends A - Answer D. Class B extends A



What is the output of this program?

1. class Area{

public static void main( string args []){

double r,pi,a;

r = 9,8;

pi = 3.14;

a= pi*r*r;

System.out.println(a);

}

}

A.301

B.301.5656

C.301.56560000

D.301.56 - Answer B. 301.5656



Which of the following is not a valid String Constant?

Select one:

a. "Hello"

b. "2002"

c. 'x'

d. "Hello Guys".

e. "X" - Answer c. 'x'



Which of these can be returned by the operator & ?

,Select one:

a. Integer

b. Integer or Boolean

c. Character

d. Boolean - Answer B. Interger or Boolean



Which operator is used by Java run time implementations to free the memory of an object
when it is no longer needed?

Select one:

a. None of the mentioned

b. delete

c. new

d. free - Answer A. none of the mentioned



What is the output of this program?1. class Output {2. public static void main(String args[]) {3.
char a[] = {'a', '5', 'A', ' '}; 4. System.out.print(Character.isDigit(a[0])+ " ");5.
System.out.print(Character.isWhitespace(a[3])+ " ");6.
System.out.print(Character.isUpperCase(a[2]));7. }8. }

Select one:

a. true false true

b. false true true

c. true true false

d. false false false - Answer false true true



Consider the two methods (within the same class)

public static int foo(int a, String s)

{

s = "Yellow";

a=a+2;

return a;

}

public static void bar()

{

int a=3;

String s = "Blue";

a = foo(a,s);

,System.out.println("a="+a+" s="+s);

}

public static void main(String args[])

{

bar();

}

What is printed on execution of these methods?

Select one:

a. a = 5 s = Blue

b. a = 5 s = Yellow

c. none of the above.

d. a = 3 s = Blue

e. a = 3 s = Yellow - Answer A. a= 5s = Blue



What is process of defining two or more methods within same class that have same name but
different parameters declaration?

Select one:

a. None of the mentioned

b. method overriding

c. method hiding

d. method overloading - Answer d method overloading



Which of these class is used to read from a file?

Select one:

a. BufferedInputStream

b. FileInputStream

c. InputStream

d. BufferedFileInputStream - Answer B. FileInputStream



Which of these class is used to read from byte array?

Select one:

a. ArrayInputStream.

b. ByteArrayInputStream

c. BufferedInputStream.

d. InputStream. - Answer b ByteArrayInputStream

, Which of these method return a largest whole number less than or equal to variable X?

Select one:

a. double min(double X)

b. double floor(double X)

c. double ciel(double X)

d. double max(double X) - Answer b. double floor(double X)



Which statement is not true in java language?

Select one:

a. A protected member of a class can be accessed from its derived class.

b. None of the above.

c. A private member of a class cannot be accessed from its derived class.

d. A public member of a class can be accessed in all the packages.

e. A private member of a class cannot be accessed by the methods of the same class. - Answer
e. A private member of a class cannot be accessed by the medthod of the same class.



Which of the folowing stements are incorrect?

Select one:

a. finalize() method must be declared protected.

b. Constructor can be parameterized.

c. Default constructor is called at the time of declaration of the object if a constructor has not
been defined.

d. finalize() method is called when a object goes out of scope and is no longer needed. - Answer
d.finalize() method is called when a object goes out of scope and is no longer needed



Which of these class can be used to implement input stream that uses a character array as the
source?

Select one:

a. FileArrayReader

b. BufferedReader

c. CharArrayReader

d. FileReader - Answer C. CharArrayReader



What is the output of this program?1. class box {2. int width, height, length, volume;3. void
finalize() {4. volume = width*height*length;5. System.out.println(volume);6. }7 protected void
volume() {8. volume = width*height*length;9. System.out.println(volume);10. }11. } 12. class