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| Core java - Interview Questions and Answers for 'Itc' - 7 question(s) found - Order By Newest | ||||
 Frequently asked to fresh graduates and less experienced developers. Among the first few questions in many interviews. | ||||
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| Ans. Composition - has-a relationship between objects. Inheritance - is-a relationship between classes. Composition - Composing object holds a reference to composed objects and hence relationship is loosely bound. Inheritance - Derived object carries the base class definition in itself and hence its tightly bound. Composition - Used in Dependency Injection Inheritance - Used in Runtime Polymorphism Composition - Single class objects can be composed within multiple classes. Inheritance - Single class can only inherit 1 Class. Composition - Its the relationship between objects. Inheritance - Its the relationship between classes. | ||||
 Sample Code for inheritance Sample Code for composition | ||||
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 Discuss Correct / Improve  java java concepts inheritance object oriented programming (oops) oops concepts composition object oriented programming (oops) oops concepts inheritance object oriented programming (oops) inheritance vs composition object oriented programming (oops) oops concepts  Asked in 29 Companies  basic  frequent | ||||
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| Ans. Polymorphism means the condition of occurring in several different forms. Polymorphism in Java is achieved in two manners 1. Static polymorphism is the polymorphic resolution identified at compile time and is achieved through function overloading whereas 2. Dynamic polymorphism is the polymorphic resolution identified at runtime and is achieved through method overriding. | ||||
| Sample Code for overloading Sample Code for overriding | ||||
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| Discuss Correct / Improve polymorphism object oriented programming (oops) oops concepts oops concepts Asked in 108 Companies Basic frequent | ||||
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| Ans. Transient variables are variable that cannot be serialized. | ||||
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| Discuss Correct / Improve java serialization transient Asked in 15 Companies intermediate rare | ||||
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| Ans. Variables used in a switch statement can only be a byte, short, int, or char ( and String with Java 7 and above ) | ||||
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| Discuss Correct / Improve java switch variable data type basic rare | ||||
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| Ans. Java 7 | ||||
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| Discuss Correct / Improve java switch string in switch | ||||
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| Ans. if statement is used to do 2 direction branching whereas switch is used to do multi direction branching in Java. Yes we can replace all switch statements with nested if statements. | ||||
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| Ans. Context Switching is the process of storing and restoring of CPU state so that Thread execution can be resumed from the same point at a later point of time. | ||||
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| Discuss Correct / Improve Threads multithreading context switching | ||||
Which of the following Java feature promotes access protection or Hiding ?
