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Test Status
COREJAVARANDOMTEST
Ques 1 :
What are the things we have to follow while creating annotations?
(A) methods must not have any throws clauses
(B) methods must not have any parameters
(C) method should return any one of primitive data types
(D) All the above
Ques 2 :
What is the result of compiling and running the following class. Select the one correct answer.
class Test
{
public void methodA(int i)
{
System.out.println(i);
}
public int methodA(int i)
{
System.out.println(i+1);
return i+1;
}
public static void main(String args[])
{
Test X = new Test();
X.methodA(5);
}
}
Select the one correct answer.
(A) The program compiles and runs printing 5.
(B) The program compiles and runs printing 6.
(C) The program gives runtime exception because it does not find the method Test.methodA(int)
(D) The program give compilation error because methodA is defined twice in class Test.
Ques 3 :
Which of the following statements are true. Select the one correct answer.
(A) Arrays in Java are essentially objects.
(B) It is not possible to assign one array to another. Individual elements of array can however be assigned
(C) Array elements are indexed from 1 to size of array.
(D) If a method tries to access an array element beyond its range, a compile warning is generated.
Ques 4 :
Given the following code snippet;
int salaries[];
int index = 0;
salaries = new int salaries[4];
while (index < 4)
{
salaries[index] = 10000;
index++;
}
What is the value of salaries [3]?
(A) 40000
(B) 50000
(C) 15000
(D) 10000
Ques 5 :
The code snippet
if( "Welcome".trim() == "Welcome".trim() )
System.out.println("Equal");
else
System.out.println("Not Equal");
What will be Answer
(A) compile and display â??Equalâ??
(B) compile and display â??Not Equalâ??
(C) cause a compiler error
(D) compile and display NULL
Ques 6 :
public Class Test implements Runnable
{
public void run(Thread t)
{
System.out.println("Running...");
}
public static void main(String [] args)
{
new thread(new Test()).start();
}
}
What is the result?
(A) Exception is thrown.
(B) Running... will be printed
(C) Compile error.
(D) Program exists without printing anything.
Ques 7 :
5.
Which of these are interfaces in the collection framework. Select the two correct answers.
a.
Set
b.
List
c.
Array
d.
Vector
e.
LinkedList
(A) a,b,c
(B) a,b
(C) b,c,d,e
(D) c,d
Ques 8 :
What is the name of collection interface used to maintain non-unique elements in order.
(A) Set
(B) List
(C) Map
(D) SortedSet
Ques 9 :
A top level class may have only the following access modifier. Select the one correct answer.
(A) package
(B) protected
(C) private
(D) public
Ques 10 :
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 11 :
What gets printed when the following program is compiled and run. Select the one correct answer.
public class test {
public static void main(String args[]) {
byte x = 3;
x = (byte)~x;
System.out.println(x);
}
}
(A) 0
(B) 3
(C) -4
(D) none of these
Ques 12 :
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 13 :
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 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 :
What is the name of collection interface used to maintain unique elements.
(A) List
(B) Set
(C) Map
(D) All of above
Ques 16 :
Which code determines the int value data closer to, but not greater than, a double value b?
(A) Int data = (int) Math.floor(b);
(B) Int data = (int) Math.abs(b);
(C) Int data = (int) Math.ceil(b);
(D) Int data = (int) Math.min(b);
Ques 17 :
What all gets printed when the following gets compiled and run. Select the two correct answers.
public class test {
public static void main(String args[]) {
String s1 = "abc";
String s2 = "abc";
if(s1 == s2)
System.out.println(1);
else
System.out.println(2);
if(s1.equals(s2))
System.out.println(3);
else
System.out.println(4);
}
}
(A) 1 2
(B) 1 3
(C) 1 4
(D) 2 4
Ques 18 :
Which methods can access to private attributes of a class?
(A) Only Static methods of the same class
(B) Only instances of the same class
(C) Only methods those defined in the same class
(D) Only classes available in the same package.
Ques 19 :
What all gets printed when the following program is compiled and run. Select the two correct answers.
public class test {
public static void main(String args[]) {
int i, j=1;
i = (j>1)?2:1;
switch(i) {
case 0: System.out.println(0); break;
case 1: System.out.println(1);
case 2: System.out.println(2); break;
case 3: System.out.println(3); break;
}
}
}
a.
0
b.
1
c.
2
d.
3
(A) a, b
(B) b, c
(C) c, b
(D) c, d
Ques 20 :
What kind of thread is the Garbage collector thread is?
(A) Non daemon thread
(B) Daemon thread
(C) Thread with dead state
(D) None of the above
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