Interview Questions and Answers - Order By Newest Ans. IndexOutofBoundException , Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve basic frequent Q302. How can we make sure that a code segment gets executed even in case of uncatched exceptions ?
Ans. By putting it within finally. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve basic frequent Q303. What is "super" used for ?
Ans. Used to access members of the base class. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 2 Companies basic frequent Q304. What is "this" keyword used for ?
Ans. Used to represent an instance of the class in which it appears. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve basic frequent Q305. Difference between boolean and Boolean ? Core Java
Ans. boolean is a primitive type whereas Boolean is a class. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve basic rare Q306. 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. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 2 Companies basic frequent 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 Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve basic frequent Q308. 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. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q309. What Design pattern Wrapper Classes implement ? Design
Ans. Adapter. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Ans. Enables the programmer to abbreviate the names of classes defined in a package. Sample Code for import Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q311. Different types of memory used by JVM ? Core Java
Ans. Class , Heap , Stack , Register , Native Method Stack. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies intermediate frequent Q312. 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. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 3 Companies Ans. By static import , we can access the static members of a class directly without prefixing it with the class name. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 4 Companies basic frequent Q314. 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 Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve basic frequent 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 Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q316. 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 Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q317. How can we manage Error Messages in the web application ? Solution
Ans. Within message.properties file. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies Frequently asked to fresh graduates. Q318. Is JVM, a compiler or interpretor ?
Ans. Its an interpretor. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve basic frequent Q319. 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. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve expert Q320. 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. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve expert Q321. Example of Chain of Responsibility Design Pattern ?
Ans. Exception Handling Throw mechanism. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve expert Q322. Example of Observer Design Pattern ?
Ans. Listeners. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve expert Q323. 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. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve expert Q324. 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. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve expert Q325. 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 Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 3 Companies basic frequent Q326. What is exception propogation ? Core Java
Ans. Passing the exception object to the calling method. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q327. Difference between nested and inner classes ?
Ans. Inner class is a type of nested class. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve basic frequent Q328. What is a nested interface ?
Ans. Any interface declared inside a class or an interface. It is static by default. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q329. What is an Externalizable interface ?
Ans. Externalizable interface is used to write the state of an object into a byte stream in compressed format. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 3 Companies Q330. Difference between serializable and externalizable interface ?
Ans. Serializable is a marker interface whereas externalizable is not. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve
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