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 Q241. How can we make sure that a code segment gets executed even in case of uncatched exceptions ?
Ans. By putting it within finally.

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   Like         Discuss         Correct / Improve     java   oops   exceptions   finally   uncatched exceptions      basic        frequent

 Q242. What is "super" used for ?
Ans. Used to access members of the base class.

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 Q243. Difference between boolean and Boolean ?Core Java
Ans. boolean is a primitive type whereas Boolean is a class.

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   Like         Discuss         Correct / Improve     java   oops   wrapper classes   boolean vs Boolean      basic        rare

 Q244. Difference between Serialization and Deserialization ?Core Java
Ans. Serialization is the process of writing the state of an object to a byte stream. Deserialization is the process of restoring these objects.

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 Q245. What are Wrapper Classes ? What are Primitive Wrapper Classes ?
Core Java
Ans. A wrapper class is any class which "wraps" or "encapsulates" the functionality of another class or component. A Wrapper Class that wraps or encapsulates the primitive data type is called Primitive Wrapper Class.

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 Q246. What Design pattern Wrapper Classes implement ?Design
Ans. Adapter.

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 Q247. Different types of memory used by JVM ?Core Java
Ans. Class , Heap , Stack , Register , Native Method Stack.

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   Like         Discuss         Correct / Improve     java   jvm   memory management   memory   advanced   architecture   technical architect     Asked in 1 Companies      intermediate        frequent
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 Q248. What is a class loader ? What are the different class loaders used by JVM ?Core Java
Ans. Part of JVM which is used to load classes and interfaces.

Bootstrap , Extension and System are the class loaders used by JVM.

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 Q249. What is a Static import ?Core Java
Ans. By static import , we can access the static members of a class directly without prefixing it with the class name.

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 Q250. Difference between Map and HashMap ?Core Java
Ans. Map is an interface where HashMap is the concrete class.

  Sample Code for map

  Sample Code for hashmap

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 Q251. What is a Property class ?Core Java
Ans. The properties class is a subclass of Hashtable that can be read from or written to a stream.

  Sample Code for Load Properties using Property Class

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 Q252. Can we have multiple servlets in a web application and How can we do that ?Java EE
Ans. Yes by making entries in web.xml

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   Like         Discuss         Correct / Improve     j2ee   servlets   servelets   web application   java   web.xml   yes-no   architecture

 Q253. How can we manage Error Messages in the web application ?Solution
Ans. Within message.properties file.

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Frequently asked to fresh graduates.
 Q254. Is JVM, a compiler or interpretor ?
Ans. Its an interpretor.

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 Q255. Example of Chain of Responsibility Design Pattern ?
Ans. Exception Handling Throw mechanism.

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 Q256. Example of Observer Design Pattern ?
Ans. Listeners.

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 Q257. Why do member variables have default values whereas local variables don't have any default value ?
Core Java
Ans. member variable are loaded into heap, so they are initialized with default values when an instance of a class is created. In case of local variables, they are stored in stack until they are being used.

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 Q258. Is it necessary that each try block to be followed by catch block ? Core Java
Ans. It should be followed by either catch or finally block.

  Sample Code for Retry in case of exception

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 Q259. What is exception propogation ?Core Java
Ans. Passing the exception object to the calling method.

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 Q260. Difference between nested and inner classes ?
Ans. Inner class is a type of nested class.

Inner classes are non static nested classes i.e the one that are associated with the instance of outer class.

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 Q261. What is a nested interface ?
Ans. Any interface declared inside a class or an interface. It is static by default.

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 Q262. What is an Externalizable interface ?
Ans. Externalizable interface is used to write the state of an object into a byte stream in compressed format.

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 Q263. Difference between serializable and externalizable interface ?
Ans. Serializable is a marker interface whereas externalizable is not.

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 Q264. What are the design considerations while making a choice between using interface and abstract class ?Core Java
Ans. Keep it as a Abstract Class if its a "Is a" Relationsship and should do subset/all of the functionality. Keep it as Interface if its a "Should Do" relationship.

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  Q265. what is the difference between collections class vs collections interface ?Core Java
Ans. Collections class is a utility class having static methods for doing operations on objects of classes which implement the Collection interface. For example, Collections has methods for finding the max element in a Collection.

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 Q266. How are classes loaded by JVM ?Core Java
Ans. Class loaders are hierarchical. The very first class is specially loaded with the help of static main() method declared in your class. All the subsequently loaded classes are loaded by the classes, which are already loaded and running.

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 Q267. Difference between static vs. dynamic class loading?Core Java
Ans. static loading - Classes are statically loaded with Java new operator.

dynamic class loading - Dynamic loading is a technique for programmatically invoking the functions of a class loader at run time.

Class.forName (Test className);

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 Q268. What is XML ?Xml
Ans. XML or eXtensible Markup Language is a markup languages for describing data and its metadata.

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 Q269. What is DTD ?Xml
Ans. DTD or Document Type Definition is a standard agreed upon way of communication between two parties. Your application can use a standard DTD to verify that data that you receive
from the outside world is valid and can be parsed by your parser.

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 Q270. What is XSD ?Xml
Ans. XSD or Xml Schema Definition is an extension of DTD. XSD is more powerful and extensible than DTD

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