Pro Android 4

Pro Android 4 shows you how to build real-world and fun mobile apps using the new Android SDK 4 (Ice Cream Sandwich), which unifies Gingerbread for smartphones, Honeycomb for tablets and augments further with Google TV and more. 

Android Tablets For Dummies April 2013

Whether you are one of the millions who already have an Android tablet, or you are interested in joining the masses with a first-time purchase, this friendly guide is perfect for you! Written by the ultimate For Dummies author Dan Gookin, this funny-but-informative book introduces you to the features of all Android tablets and details the nuances of what makes a tablet more than a smartphone yet different than a computer. You'll discover how to browse the web on your tablet, get organized with a digital calendar, enjoy music and books, use the camera, access social networks, watch video, and more.

Java Interview Questions and Answers Part 16

Q141. How to make an array copy from System?

There is a method called arraycopy in the System class. You can do it: System.arraycopy(sourceArray, srcOffset, destinationArray, destOffset,

numOfElements2Copy);

When you use this method, the destinationArray will be filled with the elements of sourceArray at the length specified.

Java Interview Questions and Answers Part 15

Q131. What is the relationship between synchronized and volatile keyword?

The JVM is guaranteed to treat reads and writes of data of 32 bits or less as atomic.(Some JVM might treat reads and writes of data of 64 bits or less as atomic in future) For long or double variable, programmers should take care in multi-threading environment. Either put these variables in a synchronized method or block, or declare them volatile.

Java Interview Questions and Answers Part 14

Q121. Can you make an instance of an abstract class? For example - java.util.Calender is an abstract class with a method getInstance() which returns an instance of the Calender class.

No! You cannot make an instance of an abstract class. An abstract class has to be subclassed. If you have an abstract class and you want to use a method which has been implemented, you may need to subclass that abstract class, instantiate your subclass and then call that method.

Java Interview Questions and Answers Part 13

Q111. What is a Container in a GUI?

A Container contains and arranges other components (including other containers) through the use of layout managers, which use specific layout policies to determine where components should go as a function of the size of the container.

Java Interview Questions and Answers Part 12

Q101. What interface must an object implement before it can be written to a stream as an object?

An object must implement the Serializable or Externalizable interface before it can be written to a stream as an object.

Java Interview Questions and Answers Part 11

Q91. What is casting?

There are two types of casting, casting between primitive numeric types and casting between object references. Casting between numeric types is used to convert larger values, such as double values, to smaller values, such as byte values. Casting between object references is used to refer to an object by a compatible class, interface, or array type reference.

Java Interview Questions and Answers Part 10

Q81. Which class should you use to obtain design information about an object?

The Class class is used to obtain information about an object's design.

Java Interview Questions and Answers Part 9

Q71. Which package has light weight components?

javax.Swing package. All components in Swing, except JApplet, JDialog, JFrame and JWindow are lightweight components.

Java Interview Questions and Answers Part 8

Q61. What is the purpose of the finally clause of a try-catch-finally statement?

The finally clause is used to provide the capability to execute code no matter whether or not an exception is thrown or caught.

Java Interview Questions and Answers Part 7

Q51. How does Java handle integer overflows and underflows?

It uses low order bytes of the result that can fit into the size of the type allowed by the operation.

Java Interview Questions and Answers Part 6

Q41.  What are wrapped classes?

Wrapped classes are classes that allow primitive types to be accessed as objects.

Java Interview Questions and Answers Part 5

Q31. What happens when a thread cannot acquire a lock on an object?

If a thread attempts to execute a synchronized method or synchronized statement and is unable to acquire an object's lock, it enters the waiting state until the lock becomes available.

Java Interview Questions and Answers Part 4

Q21. What is multi-threading?

Multi-threading means various threads that run in a system.

Java Interview Questions and Answers Part 3

Q11. Name the container which uses Border Layout as their default layout?

A container which uses Border Layout as their default are: window, Frame and Dialog classes.

Java Interview Questions and Answers Part 2

Q1. How are Observer and Observable used?

Objects that subclass the Observable class maintain a list of observers. When an Observable object is updated, it invokes the update() method of each of its observers to notify the observers that it has changed state. The Observer interface is implemented by objects that observe Observable objects.

Java Interview Questions and Answers Part 1

Q1. What is Collection API ?

The Collection API is a set of classes and interfaces that support operation on collections of objects. These classes and interfaces are more flexible, more powerful, and more regular than the vectors, arrays, and hashtables if effectively replaces. Example of classes: HashSet, HashMap, ArrayList, LinkedList, TreeSet and TreeMap. Example of interfaces: Collection, Set, List and Map.