Q21. Given:
What will be the output?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: D
Q22. Given:
What is the result?
A. hEllOjAvA!
B. Hello java!
C. Out of limits hEllOjAvA!
D. Out of limits
Answer: C
Q23. Which of the following exception will be thrown due to the statement given here?
int array[] = new int[-2];
A. NullPointerException
B. NegativeArraySizeException
C. ArrayIndexOutOfBoundsException
D. IndexOutOfBoundsException
E. This statement does not cause any exception.
Answer: B
Explanation:
In given statement we can see that, we have passed negative value for creating int array,
which results a NegativeArraySize Except ion. Hence option B is correct.
Option A is incorrect as it is thrown when an application attempts to use null in a case
where an object is required.
Option D is incorrect as IndexOutOfBoundsException thrown to indicate that an index of
some sort (such as to an array, to a string, or to a vector) is out of range.
REFERENCE
rhttpy/docs.oracle.com/iavase/S/docs/api/java/lang/NegativeArraySizeException.html
Q24. Given:
Which of the following is equivalent to the above code fragment?
A. System.out.printLn(x>10?">,': "<":,'=");
B. System.out.println(x>10? ">"?"<":"=");
C. System.out.println(x>10?">":x<10?"<":"=");
D. System.out.printLn(x>10?">"?,'<"?"=");
E. None of the above
Answer: B
Explanation:
Option A is incorrect as we can't use abstract with non abstract method, (here method has method body.) Option C is incorrect as when overriding method we can't use more restrictive access modifier, so trying to use private to override default access Level method causes a compile time error. Option D is incorrect as default methods (not methods with default access level) are allowed only in interfaces. Option E is incorrect as method all ready has void as return type, so we can't add int there. Option B is correct as we can use final there, since the method is non abstract
https://docs.oracle.com/javase/tutorial/java/landl/polymorphism.html
Q25. Given:
Which code fragment should you use at line n1 to instantiate the dvd object successfully?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: C
Q26. Given:
How many objects have been created when the line / / do complex stuff is reached?
A. Two
B. Three
C. Four
D. Six
Answer: C
Q27. Given the code fragment:
What is the result?
A. May 04, 2014T00:00:00.000
B. 2014-05-04T00:00: 00. 000
C. 5/4/14T00:00:00.000
D. An exception is thrown at runtime.
Answer: D
Explanation:
java.time.temporal.UnsupportedTemporalTypeException: Unsupported field: HourOfDay
Q28. Given the code format:
Which code fragment must be inserted at line 6 to enable the code to compile?
A. DBConfiguration f; return f;
B. Return DBConfiguration;
C. Return new DBConfiguration;
D. Retutn 0;
Answer: B
Q29. public class StringReplace {
public static void main(String[] args) {
String message = "Hi everyone!";
System.out.println("message = " + message.replace("e", "X")); }
}
What is the result?
A. message = Hi everyone!
B. message = Hi XvXryonX!
C. A compile time error is produced.
D. A runtime error is produced.
E. message =
F. message = Hi Xveryone!
Answer: B
Q30. Given:
Class A { }
Class B { }
Interface X { }
Interface Y { }
Which two definitions of class C are valid?
A. Class C extends A implements X { }
B. Class C implements Y extends B { }
C. Class C extends A, B { }
D. Class C implements X, Y extends B { }
E. Class C extends B implements X, Y { }
Answer: A,E
Explanation: extends is for extending a class.
implements is for implementing an interface. Java allows for a class to implement many interfaces.