Technical Field Of Java Development and Programming

1. Synchronized is a keyword to tell a Thread to grab an Object lock before continuing execution.

True

False

2. Methods that are marked protected can be called in any subclass of that class.

True

False

3. An abstract class can have non-abstract methods.

True

False

4. Primitive datatypes are allocated on a stack.

True

False

5. Can you compare a boolean to an integer?

Yes

No

6. Inner classes can be defined within methods.

True

False

7. If class A implements an interface does it need to implement all methods of that interface?

Yes, always

No, not when A is abstract

8. Java keywords are written in lowercase as well as uppercase

True

False

9. Following code will result in: int a1 = 5; double a2 = (float)a1;

Compilation error

Runtime error

No errors

10. A class cannot be declared

Static

Private

Default

11. A class can be transient

True

False

12. What is an instanceof

A methods in object

An operator and keyword

13. Following code will result in: int a = 3.5;

Compilation error

Runtime error

A being 3.5

A being 3

14. Following code will result in: class A { int b = 1; public static void main(String [] args) { System.out.println("b is " + b); }}

Compilation error

Runtime Error

Runtime Exception

Output of b is 1

15. Following code will result in: class A { public static void main(String [] args) {B b = new A(); }} class B extends A {}

Compile error

Runtime Exception

No error

16. What is the size of a Char?

4 bits

7 bits

8 bits

16 bits

17. Following code will result in: class A { public static void main(String [] args) {A a = new B(); }} class B extends A {}

Compiler error

Runtime Exception

No errors

18. The default statement of a switch is always executed

By marking it private

By marking it volatile

By marking it transient

You can not.

19. What is default layout manager for panels and applets?

Flowlayout

Gridlayout

BorderLayout

20. The methods wait(), notify() and notifyAll() in Object need to be called from synchronized pieces of code

True

False

21. Integer a = new Integer(2); Integer b = new Integer(2); What happens when you do if (a==b)?

Compiler error

Runtime Exception

True

False

22. Following code will result in: int a = 9/0;

Compilation error: Divisions must be in a try block

Compilation error: DivideByZeroException

Runtime Exception

No Error: a is NaN

23. You execute the code below in an empty directory. What is the result? File f1 = new File("dirname"); File f2 = new File(f1, "filename");

A new directory called dirname is created in the current working directory

A new directory called dirname and a new file called filename are created, both in the current working directory

A new file called filename is created in the current working directory

No directory is created, and no file is created

24. Following code will result in: float a = 9/0;

Compilation error: Divisions must be in a try block

Compilation error: DivideByZeroException

Runtime Exception

No Error: a is NaN

25. Which one does not extend java.lang.Number

Integer

Boolean

Character

Long

Short

Submit

26. Which of the following statements are true?

When an instance of File is garbage collected, the corresponding file on the local file system is deleted.

None of the above

Submit

Technical Field Of Java Development and Programming

1. Synchronized is a keyword to tell a Thread to grab an Object lock before continuing execution.

2.

What first name or nickname would you like us to use?

2. Methods that are marked protected can be called in any subclass of that class.

3. An abstract class can have non-abstract methods.

4. Primitive datatypes are allocated on a stack.

5. Can you compare a boolean to an integer?

6. Inner classes can be defined within methods.

7. If class A implements an interface does it need to implement all methods of that interface?

8. Java keywords are written in lowercase as well as uppercase

9. Following code will result in: int a1 = 5; double a2 = (float)a1;

10. A class cannot be declared

11. A class can be transient

12. What is an instanceof

13. Following code will result in: int a = 3.5;

14. Following code will result in: class A { int b = 1; public static void main(String [] args) { System.out.println("b is " + b); }}

15. Following code will result in: class A { public static void main(String [] args) {B b = new A(); }} class B extends A {}

16. What is the size of a Char?

17. Following code will result in: class A { public static void main(String [] args) {A a = new B(); }} class B extends A {}

18. The default statement of a switch is always executed

19. What is default layout manager for panels and applets?

20. The methods wait(), notify() and notifyAll() in Object need to be called from synchronized pieces of code

21. Integer a = new Integer(2); Integer b = new Integer(2); What happens when you do if (a==b)?

22. Following code will result in: int a = 9/0;

23. You execute the code below in an empty directory. What is the result? File f1 = new File("dirname"); File f2 = new File(f1, "filename");

24. Following code will result in: float a = 9/0;

25. Which one does not extend java.lang.Number

26. Which of the following statements are true?