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Test Status
COREJAVARANDOMTEST
Ques 1 :
What gets printed when the following program is compiled and run. Select the one correct answer.
class test {
public static void main(String args[]) {
int i,j,k,l=0;
k = l++;
j = ++k;
i = j++;
System.out.println(i);
}
}
(A) 0
(B) 1
(C) 2
(D) 3
Ques 2 :
What happens when the following program is compiled and run. Select the one correct answer.
public class example
{
int i = 0;
public static void main(String args[])
{
int i = 1;
change_i(i);
System.out.println(i);
}
public static void change_i(int i)
{
i = 2;
i *= 2;
}
}
(A) The program prints 0.
(B) The program prints 2.
(C) The program prints 1.
(D) The program prints 4.
Ques 3 :
What gets written on the screen when the following program is compiled and run. Select the one right answer.
public class test {
public static void main(String args[]) {
int i;
float f = 2.3f;
double d = 2.7;
i = ((int)Math.ceil(f)) * ((int)Math.round(d));
System.out.println(i);
}
}
(A) 4
(B) 5
(C) 6
(D) 9
Ques 4 :
What is the name of collection interface used to maintain non-unique elements in order.
(A) Set
(B) List
(C) Map
(D) SortedSet
Ques 5 :
What gets displayed on the screen when the following program is compiled and run. Select the one correct answer.
public class test {
public static void main(String args[]) {
boolean x = false;
int a;
if(x) a = x ? 1: 2;
else a = x ? 3: 4;
System.out.println(a);
}
}
(A) 1
(B) 2
(C) 3
(D) 4
Ques 6 :
Select the one correct answer. The smallest number that can be represented using short primitive type in Java is -
(A) -127
(B) -128
(C) 0
(D) -32768
Ques 7 :
Which of the following are legal declaration and definition of a method. Select all correct answers.
a.
void method() {};
b.
void method(void) {};
c.
method() {};
d.
method(void) {};
e.
void method {};
(A) a,b
(B) a
(C) a,b,c
(D) b,d,e
Ques 8 :
Assume that File is an abstract class and has toFile() method. ImageFile and BinaryFile are concrete classes of the abstract class File.
Also, assume that the method toFile() is implemented in both Binary File and Image File. A File references an ImageFile object in memory and the toFile method is called, which implementation method will be called?
(A) Binary File
(B) Image File
(C) Both File and Binary Files
(D) None of the above
Ques 9 :
What is the meaning of the return data type void?
(A) An empty memory space is returned so that the developers can utilize it.
(B) void is not supported in Java
(C) void returns no data type.
(D) null
Ques 10 :
What gets displayed on the screen when the following program is compiled and run. Select the one correct answer.
public class test {
public static void main(String args[]) {
int x, y;
x = 5 >> 2;
y = x >>> 2;
System.out.println(y);
}
}
(A) 5
(B) 2
(C) 80
(D) 0
Ques 11 :
Which are true in case of interface?
(A) we can create object implementation to an interface
(B) all type of modifiers are allowed to an interface
(C) we instantiate an interface directly
(D) we can mark interface as final
Ques 12 :
After the following code fragment, what is the value in fname?
String str;
int fname;
str = "Foolish boy.";
fname = str.indexOf("fool");
(A) 0
(B) 2
(C) -1
(D) 4
Ques 13 :
If result = 2 + 3 * 5, what is the value and type of â??resultâ?? variable?
(A) 17, byte
(B) 25, byte
(C) 17, int
(D) 25, int
Ques 14 :
What is the name of the Collection interface used to represent elements in a sequence (in a particular order). Select the one correct answer.
(A) Collection
(B) Set
(C) List
(D) Map
Ques 15 :
Which of the following statements is true?
(A) An exception can be thrown by throw keyword explicitly.
(B) An exception can be thrown by throws keyword explicitly.
Ques 16 :
What is the data type for the number 9.6352?
(A) float
(B) double
(C) Float
(D) Double
Ques 17 :
Select the one correct answer. Which method defined in Integer class can be used to convert an Integer object to primitive int type.
(A) valueOf
(B) intValue
(C) getInt
(D) getInteger
Ques 18 :
Name the access modifier which when used with a method, makes it available to all the classes in the same package and to all the subclasses of the class.
(A) public
(B) private
(C) protected
(D) default
Ques 19 :
Given the following declarations, which of the assignments given in the options below would compile. Select the two correct answers.
int i = 5;
boolean t = true;
float f = 2.3F;
double d = 2.3;
a.
t = (boolean) i;
b.
f = d;
c.
d = i;
d.
i = 5;
e.
f = 2.8;
(A) a,b
(B) b,c
(C) c,d
(D) a,d
Ques 20 :
What is an aggregate object?
(A) An object with only primitive attributes
(B) An instance of a class which has only static methods
(C) An instance which has other objects
(D) None of the above
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