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 Q301. What is "this" keyword used for ?
Ans. Used to represent an instance of the class in which it appears.

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 Q302. Difference between boolean and Boolean ?Core Java
Ans. boolean is a primitive type whereas Boolean is a class.

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 Q303. 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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 Q304. What is an Enum type ?Core Java
Ans. An enum type is a special data type that enables for a variable to be a set of predefined constants

  Sample Code for enum

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 Q305. 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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 Q306. What Design pattern Wrapper Classes implement ?Design
Ans. Adapter.

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 Q307. What is "Import" used for ?Core Java
Ans. Enables the programmer to abbreviate the names of classes defined in a package.

  Sample Code for import

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 Q308. Different types of memory used by JVM ?Core Java
Ans. Class , Heap , Stack , Register , Native Method Stack.

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 Q309. 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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 Q310. 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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 Q311. 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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 Q312. 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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 Q313. 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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 Q314. 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.
 Q315. Is JVM, a compiler or interpretor ?
Ans. Its an interpretor.

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 Q316. Difference between Proxy and Adapter ?Design
Ans. Adapter object has a different input than the real subject whereas Proxy object has the same input as the real subject. Proxy object is such that it should be placed as it is in place of the real subject.

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 Q317. Difference between Adapter and Facade ?Design
Ans. The Difference between these patterns in only the intent. Adapter is used because the objects in current form cannot communicate where as in Facade , though the objects can communicate , A Facade object is placed between the client and subject to simplify the interface.

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 Q318. Example of Chain of Responsibility Design Pattern ?
Ans. Exception Handling Throw mechanism.

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 Q319. Example of Observer Design Pattern ?
Ans. Listeners.

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 Q320. Which kind of memory is used for storing object member variables and function local variables ?
Ans. Local variables are stored in stack whereas object variables are stored in heap.

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 Q321. 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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 Q322. 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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 Q323. What is exception propogation ?Core Java
Ans. Passing the exception object to the calling method.

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 Q324. 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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 Q325. What is a nested interface ?
Ans. Any interface declared inside a class or an interface. It is static by default.

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 Q326. 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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 Q327. Difference between serializable and externalizable interface ?
Ans. Serializable is a marker interface whereas externalizable is not.

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 Q328. Can we instantiate the object of derived class if parent constructor is protected ?Core Java
Ans. Yes, as protected constructor is accessible in sub class.

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 Q329. Can we declare an abstract method private ?
Ans. No Abstract methods can only be declared protected or public.

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 Q330. 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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