Java Programming Basics Online Test

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Java Programming Basics

Description: java
Number of Questions: 15
Created by: Shankara Prabhu
Tags: java Java/Oracle /C/C++ Data Types Variables and Storage Classes Arrays and Pointers

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What is the current java version number and its name?

Standard Edition 7 and Tiger
Standard Edition 7 and Dolphin
Standard Edition 6 and Mustang
Standard Edition 6 and Dolphin
Standard Edition 7 and Mustang

Which of the following variable types is/are not serializable in Java?

Instance
Static
Transient
Both 1 and 2
Both 2 and 3

Which of the following is a thread safe class in Java?

StringBuffer
ArrayList
HashMap
StringBuilder
String

What is the 'out' in the System.out.println() statement in Java?

PrintWriter class object defined in System class
Bufferwriter class defined in System class
System class object
PrintStream class defined in System class
BufferReader class object

Which of the following is the drawback of java when compared with other programming languages?

Having multi threading feature
Not having low level programming support
Having robustness
Not having pointers
Not having struct data type

Which of the following is a false statement?

Catch statement can rethrow an exception in Java.
Empty catch block is accepted by Java.
Main is a daemon thread.
Garbage collector is a daemon thread.
Garbage collector can also run forcibly.

How to get the descriptive information about the exception occurred in a program?

multiple catch statements
single catch with exception type as Exception
printQueueTrace();
printStackTrace();
printLinkedlistTrace();

Which of the following is not an advantage of innerclass in Java?

Maintainability is easier.
Encapslation is easily achieved.
Better accesibility restrictions
Inner class members are hidden from outer class.
Inheritance is easily achieved.

Which of the following access modifers is assigned to a varible in java class, if explicitly, nothing is mentioned?

Public
Private
Protected
Default type
It causes compile time error.

Choose the correct statement about the abstract class.

An abstract class can be instantiated and must have a main method.
An abstract class cannot be instantiated but has a main method.
An abstract class cannot be instantiated and does not have a main method.
An abstract class must be instantiated and does not have a main method.
An abstract class also contains abstract methods.

Which of the following is not a marker interface?

java.io.Serializable
java.lang.Cloneable
java.util.EventListener
Java.util.stack
None of the above

Which of the following statements is not true?

Constructor cannot be declared as final.
Constructor returns the value.
Constructor is just like a method invoked at the time of object creation.
Constructor cannot be inherited.
Constructor cannot be overloaded.

Which of the following are the main features of Java?

Abstraction, inheritance, encapsulation, polymorphism
Atomicity, polymorphism, interface
Abstraction, inheritance, isolation
Inheritance, encapsulation, durabilty
Portability, consistency, durability

In which of the following siituations does finally block execute?

Return statement in catch block.
System.exit() present in catch block.
Exception occurred in finally block.
The death of thread occurs before completion of execution.
Break; statement in catch block.

Which of the following statements is/are true regarding a constructor?

Calling one constructor from other constructor is possible.
The default value of the Boolean type is false.
The garbage collector invokes an object's finalize() method, when it detects that the object has become unreachable.
The dot operator(.) is used to access the instance variables and methods of class objects. It is also used to access classes and sub-packages from a package.
All of the above

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