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Android interview questions and answers for Experienced (1 to 2 years) Part-1
1. Explain Java Final Keyword ?
Final variable can be assigned only once.
Final method can not be overriden in subclass.
Final classes can not be extended.
2.Can a final class in java be extended ?
NO. Java classes declared as final cannot be extended.
3.Explain Java Static Keyword ?
Static variables are initialized only once , at the start of the execution . These variables will be initialized first, before the initialization of any instance variables
A single copy to be shared by all instances of the class
A static variable can be accessed directly by the class name and doesn’t need any object
Java instance variables are given separate memory for storage. If there is a need for a variable to be common to all the objects of a single java class,
Similar to static variables, java static methods are also common to classes and not tied to a java instance.
4.How are the exceptions handled in java?
When an exception occurs the execution of the program is transferred to an appropriate exception handler.The try-catch-finally block is used to handle the exception.
5.What is unchecked exception(Runtime Exception )?
Runtime exceptions represent problems that are the result of a programming problem such as dividing by zero, trying to access an object through a null reference.
Runtime exceptions need not be explicitly caught in try catch block as it can occur anywhere in a program.
The solution to rectify is to correct the programming logic where the exception has occurred or provide a check.
6.What is checked exception?
Checked exception are the exceptions which forces the programmer to catch them explicitly in try-catch block. It is a subClass of Exception. Example: IOException.
7.Use of java private constructor?
Private constructors prevent a class from being explicitly instantiated by its callers.
There are some common cases where a private constructor can be useful:
classes containing only static utility methods
classes containing only constants
type safe enumerations
singletons
8.What is Intents and Intent Filters ?
The core components of an application — activities, services, and broadcast receivers — are activated through messages, called intents.
Intent filter describes a capability of the core components(activities, services, and broadcast receivers).
9.What is AndroidManifest File?
AndroidManifest file is a root directory of Android applications which contains all the details needed by the android system about the application.
10.Explain Service LifeCycle of Android?
11.What is a content provider?
A SQLite database is private to the application which creates it. If you want to share data with other applications you can use a content provider.
Its is typically used to share data with other application.
I will update more Android interview questions and answers. Stay tuned.
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Final variable can be assigned only once.
Final method can not be overriden in subclass.
Final classes can not be extended.
2.Can a final class in java be extended ?
NO. Java classes declared as final cannot be extended.
3.Explain Java Static Keyword ?
Static variables are initialized only once , at the start of the execution . These variables will be initialized first, before the initialization of any instance variables
A single copy to be shared by all instances of the class
A static variable can be accessed directly by the class name and doesn’t need any object
Java instance variables are given separate memory for storage. If there is a need for a variable to be common to all the objects of a single java class,
Similar to static variables, java static methods are also common to classes and not tied to a java instance.
4.How are the exceptions handled in java?
When an exception occurs the execution of the program is transferred to an appropriate exception handler.The try-catch-finally block is used to handle the exception.
5.What is unchecked exception(Runtime Exception )?
Runtime exceptions represent problems that are the result of a programming problem such as dividing by zero, trying to access an object through a null reference.
Runtime exceptions need not be explicitly caught in try catch block as it can occur anywhere in a program.
The solution to rectify is to correct the programming logic where the exception has occurred or provide a check.
6.What is checked exception?
Checked exception are the exceptions which forces the programmer to catch them explicitly in try-catch block. It is a subClass of Exception. Example: IOException.
7.Use of java private constructor?
Private constructors prevent a class from being explicitly instantiated by its callers.
There are some common cases where a private constructor can be useful:
classes containing only static utility methods
classes containing only constants
type safe enumerations
singletons
8.What is Intents and Intent Filters ?
The core components of an application — activities, services, and broadcast receivers — are activated through messages, called intents.
Intent filter describes a capability of the core components(activities, services, and broadcast receivers).
9.What is AndroidManifest File?
AndroidManifest file is a root directory of Android applications which contains all the details needed by the android system about the application.
10.Explain Service LifeCycle of Android?
11.What is a content provider?
A SQLite database is private to the application which creates it. If you want to share data with other applications you can use a content provider.
Its is typically used to share data with other application.
I will update more Android interview questions and answers. Stay tuned.
For More Updates Like us on Facebook
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