Technical Field Of Java Development And Programming

26 Questions | By Vijayaprakash | Last updated: Mar 15, 2022 | Total Attempts: 67

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This test will measure the applicants knowledge and competency in the technical field of Java development and programming

Questions and Answers

1.

What is the size of a Char?
- A.
  
  4 bits
- B.
  
  7 bits
- C.
  
  8 bits
- D.
  
  16 bits
2.

A class cannot be declared
- A.
  
  Static
- B.
  
  Private
- C.
  
  Default
3.

Following code will result in: int a = 3.5;
- A.
  
  Compilation error
- B.
  
  Runtime error
- C.
  
  A being 3.5
- D.
  
  A being 3
4.

Following code will result in: int a1 = 5; double a2 = (float)a1;
- A.
  
  Compilation error
- B.
  
  Runtime error
- C.
  
  No errors
5.

Following code will result in: int a = 9/0;
- A.
  
  Compilation error: Divisions must be in a try block
- B.
  
  Compilation error: DivideByZeroException
- C.
  
  Runtime Exception
- D.
  
  No Error: a is NaN
6.

Following code will result in: float a = 9/0;
- A.
  
  Compilation error: Divisions must be in a try block
- B.
  
  Compilation error: DivideByZeroException
- C.
  
  Runtime Exception
- D.
  
  No Error: a is NaN
7.

A class can be transient
- A.
  
  True
- B.
  
  False
8.

Following code will result in: class A { int b = 1; public static void main(String [] args) { System.out.println("b is " + b); }}
- A.
  
  Compilation error
- B.
  
  Runtime Error
- C.
  
  Runtime Exception
- D.
  
  Output of b is 1
9.

Following code will result in: class A { public static void main(String [] args) {B b = new A(); }} class B extends A {}
- A.
  
  Compile error
- B.
  
  Runtime Exception
- C.
  
  No error
10.

Following code will result in: class A { public static void main(String [] args) {A a = new B(); }} class B extends A {}
- A.
  
  Compiler error
- B.
  
  Runtime Exception
- C.
  
  No errors
11.

Methods that are marked protected can be called in any subclass of that class.
- A.
  
  True
- B.
  
  False
12.

An abstract class can have non-abstract methods.
- A.
  
  True
- B.
  
  False
13.

Java keywords are written in lowercase as well as uppercase
- A.
  
  True
- B.
  
  False
14.

What is an instanceof
- A.
  
  A methods in object
- B.
  
  An operator and keyword
15.

Primitive datatypes are allocated on a stack.
- A.
  
  True
- B.
  
  False
16.

Can you compare a boolean to an integer?
- A.
  
  Yes
- B.
  
  No
17.

If class A implements an interface does it need to implement all methods of that interface?
- A.
  
  Yes, always
- B.
  
  No, not when A is abstract
18.

Integer a = new Integer(2); Integer b = new Integer(2); What happens when you do if (a==b)?
- A.
  
  Compiler error
- B.
  
  Runtime Exception
- C.
  
  True
- D.
  
  False
19.

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

Inner classes can be defined within methods.
- A.
  
  True
- B.
  
  False
21.

Synchronized is a keyword to tell a Thread to grab an Object lock before continuing execution.
- A.
  
  True
- B.
  
  False
22.

The default statement of a switch is always executed
- A.
  
  By marking it private
- B.
  
  By marking it volatile
- C.
  
  By marking it transient
- D.
  
  You can not.
23.

Which one does not extend java.lang.Number
- A.
  
  Integer
- B.
  
  Boolean
- C.
  
  Character
- D.
  
  Long
- E.
  
  Short
24.

What is default layout manager for panels and applets?
- A.
  
  Flowlayout
- B.
  
  Gridlayout
- C.
  
  BorderLayout
25.

Which of the following statements are true?
- A.
  
  When you construct an instance of File, if you do not use the filenaming semantics of the local machine, the constructor will throw an IOException.
- B.
  
  When you construct an instance of File, if the corresponding file does not exist on the local file system, one will be created.
- C.
  
  When an instance of File is garbage collected, the corresponding file on the local file system is deleted.
- D.
  
  None of the above