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Test Status
COREJAVARANDOMTEST
Ques 1 :
The width in bits of double primitive type in Java is --. Select the one correct answer.
(A) The width of double is platform dependent
(B) 64
(C) 128
(D) 8
Ques 2 :
What is the range of values that can be specified for an int. Select the one correct answer.
(A) The range of values is compiler dependent.
(B) -231 to 231 - 1
(C) 231-1 to 231
(D) -215 to 215 - 1
Ques 3 :
Which all lines are part of the output when the following code is compiled and run. Select the six correct answers.
public class test
{
public static void main(String args[])
{
for(int i = 0; i < 3; i++)
{
for(int j = 3; j >= 0; j--)
{
if(i == j) break;
System.out.println(i + " " + j);
}
}
}
}
a.
0 0
b.
0 1
c.
0 2
d.
0 3
e.
1 0
f.
1 1
g.
1 2
h.
1 3
i.
2 0
j.
2 1
k.
2 2
l.
2 3
m.
3 0
N.
3 1
O.
3 2
P.
3 3
(A) a, b, c, f, h, i
(B) c, d, g, h, i, k
(C) b, c, d, g, h, l
(D) d, e, f, g, j, k
Ques 4 :
What gets printed when the following program is compiled and run? Select the one correct answer.
class xyz {
static int i;
public static void main(String args[]) {
while (i < 0) {
i--;
}
System.out.println(i);
}
}
(A) The program does not compile as i is not initialized.
(B) The program compiles but does not run.
(C) The program compiles and runs but does not print anything.
(D) The program prints 0.
Ques 5 :
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 6 :
Which of the following statements are correct. Select the four correct answers.
a.
A Java program must have a package statement.
b.
A package statement if present must be the first statement of the program (barring any comments).
c.
If a Java program defines both a package and import statement, then the import statement must come before the package statement.
d.
An empty file is a valid source file.
e.
A Java file without any class or interface definitions can also be compiled.
f.
If an import statement is present, it must appear before any class or interface definitions.
(A) b, d, e, f
(B) a, b, d, f
(C) d, e, a, c
(D) c, d, b, a
Ques 7 :
By using which modifier we can prevent from overridden?
(A) final
(B) static
(C) we cant prevent
(D) by default it provides
Ques 8 :
What all gets printed when the following program is compiled and run. Select the one correct answer.
public class test {
public static void main(String args[]) {
int i=0, j=2;
do {
i=++i;
j--;
} while(j>0);
System.out.println(i);
}
}
(A) 0
(B) 1
(C) 2
(D) The program does not compile because of statement "i=++i;"
Ques 9 :
Given a one dimensional array arr, what is the correct way of getting the number of elements in arr. Select the one correct answer.
(A) arr.length
(B) arr.length - 1
(C) arr.size
(D) arr.length()
Ques 10 :
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 11 :
To make a variable defined in a class accessible only to methods defined in the classes in same package, which of the following keyword should be used. Select the one correct answer.
(A) By using the keyword public before the variable.
(B) By using the keyword protected before the variable.
(C) By using the keyword private before the variable.
(D) The variable should not be preceded by any of the above mentioned keywords.
Ques 12 :
Using up to four characters what is the Java representation of the number 23 in hex?
(A) 0x17
(B) 0x18
(C) 0x19
(D) 0x20
Ques 13 :
Which of these are Java keywords. Select the five correct answers
a.
TRUE
b.
volatile
c.
transient
d.
native
e.
interface
f.
then
g.
new
(A) b, d, f, g
(B) a, b, d, g
(C) b, c, d, e, g
(D) d, e, f, g
Ques 14 :
Which of the following statements is preferred to create a string "Welcome to Java Programming"?
(A) String str = â??Welcome to Java Programmingâ??
(B) String str = new String( â??Welcome to Java Programmingâ?? )
(C) String str; str = â??Welcome to Java Programmingâ??
(D) String str; str = new String (â??Welcome to Java Programmingâ?? )
Ques 15 :
The initial value of an instance variable of type String that is not explicitly initialized in the program is --. Select the one correct answer.
(A) null
(B) ""
(C) NULL
(D) The instance variable must be explicitly assigned.
Ques 16 :
Consider the following code snippet. What will be assigned to the variable fourthChar, if the code is executed?
String str = new String("Java");
char fourthChar = str.charAt(4);
(A) 'a'
(B) 'v'
(C) throws StringIndexOutofBoundsException
(D) null characater
Ques 17 :
Is this true or false. Map interface is derived from the Collection interface.
(A) True
(B) False
Ques 18 :
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 19 :
What all gets printed when the following gets compiled and run. Select the two correct answers.
public class example {
public static void main(String args[]) {
int x = 0;
if(x > 0) x = 1;
switch(x) {
case 1: System.out.println(1);
case 0: System.out.println(0);
case 2: System.out.println(2);
break;
case 3: System.out.println(3);
default: System.out.println(4);
break;
}
}
}
A.
0
B.
1
C.
2
D.
3
E.
4
(A) 1, 0, 2
(B) 3, 4
(C) 0, 2
(D) 1
Ques 20 :
How many bytes are used to represent the primitive data type int in Java. Select the one correct answer.
(A) 2
(B) 4
(C) 8
(D) 1
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