100+ MCQ & Answer Java programming | page-04 |Computer Engineering MCQ And Answer

31.

Which of the following is a valid syntax to synchronize the HashMap?

A. Map m = hashMap.synchronizeMap();

B. HashMap map =hashMap.synchronizeMap();

C. Map m1 = Collections.synchronizedMap(hashMap);

D. Map m2 = Collection.synchronizeMap(hashMap);

Answer

32.
Which of the following is a mutable class in java?

A. java.lang.String

B. java.lang.Byte

C. java.lang.Short

D. java.lang.StringBuilder

Answer

33.

What will be the output of the following program?
abstract class MyFirstClass
{
abstract num (int a, int b) { }

}

A. No error

B. Method is not defined properly

C. Constructor is not defined properly

D. Extra parentheses

Answer

34.

What is meant by the classes and objects that dependents on each other?

A. Tight Coupling

B. Cohesion

C. Loose Coupling

D. None of the above

Answer

35.
Which of the following code segment would execute the stored procedure “getPassword()” located in a database server?

A. CallableStatement cs = connection.prepareCall(“{call.getPassword()}”); cs.executeQuery();

B. CallabledStatement callable = conn.prepareCall(“{call getPassword()}”); callable.executeUpdate();

C. CallableStatement cab = con.prepareCall(“{call getPassword()}”); cab.executeQuery();

D. Callablestatement cstate = connect.prepareCall(“{call getpassword()}”); cstate.executeQuery();

Answer

36.

How many threads can be executed at a time?

A. Only one thread

B. Multiple threads

C. Only main (main() method) thread

D. Two threads

Answer

37.

If three threads trying to share a single object at the same time, which condition will arise in this scenario?

A. Time-Lapse

B. Critical situation

C. Race condition

D. Recursion

Answer

38.

If a thread goes to sleep

A. It releases all the locks it has

B. It does not release any locks.

C. It releases half of its locks.

D. It releases all of its lock except one.

Answer

39.

Which of the following modifiers can be used for a variable so that it can be accessed by any thread or a part of a program?

A. global

B. transient

C. volatile

D. default

Answer

40.

In character stream I/O, a single read/write operation performs _____

A. Two bytes read/write at a time.

B. Eight bytes read/write at a time.

C. One byte read/write at a time.

D. Five bytes read/ write at a time.

Answer

100+ MCQ & Answer Java programming | page-04 |Computer Engineering MCQ And Answer

31.

Which of the following is a valid syntax to synchronize the HashMap?

Option : C

32.
Which of the following is a mutable class in java?

Option : D

33.

What will be the output of the following program?
abstract class MyFirstClass
{
abstract num (int a, int b) { }

}

Option : B

34.

What is meant by the classes and objects that dependents on each other?

Option : A

35.
Which of the following code segment would execute the stored procedure “getPassword()” located in a database server?

Option : C

36.

How many threads can be executed at a time?

Option : B

37.

If three threads trying to share a single object at the same time, which condition will arise in this scenario?

Option : C

38.

If a thread goes to sleep

Option : B

39.

Which of the following modifiers can be used for a variable so that it can be accessed by any thread or a part of a program?

Option : C

40.

In character stream I/O, a single read/write operation performs _____

Option : A

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31. Which of the following is a valid syntax to synchronize the HashMap?

Option : C

32. Which of the following is a mutable class in java?

Option : D

33. What will be the output of the following program? abstract class MyFirstClass { abstract num (int a, int b) { } }

Option : B

34. What is meant by the classes and objects that dependents on each other?

Option : A

35. Which of the following code segment would execute the stored procedure “getPassword()” located in a database server?

Option : C

36. How many threads can be executed at a time?

Option : B

37. If three threads trying to share a single object at the same time, which condition will arise in this scenario?

Option : C

38. If a thread goes to sleep

Option : B

39. Which of the following modifiers can be used for a variable so that it can be accessed by any thread or a part of a program?

Option : C

40. In character stream I/O, a single read/write operation performs _____

Option : A

Leave a Reply Cancel reply

31.

Which of the following is a valid syntax to synchronize the HashMap?

32.
Which of the following is a mutable class in java?

33.

What will be the output of the following program?
abstract class MyFirstClass
{
abstract num (int a, int b) { }

}

34.

What is meant by the classes and objects that dependents on each other?

35.
Which of the following code segment would execute the stored procedure “getPassword()” located in a database server?

36.

How many threads can be executed at a time?

37.

If three threads trying to share a single object at the same time, which condition will arise in this scenario?

38.

If a thread goes to sleep

39.

Which of the following modifiers can be used for a variable so that it can be accessed by any thread or a part of a program?

40.

In character stream I/O, a single read/write operation performs _____