Abhishek Bagela Blog's

#Java Inheritance Interview Questions      #inheritance | #multilelelinheritance | #single inheritance | #javainheritance | #oppsinheritance |     #java  | #OOps | #corejava | #corejavainheritance | #java inheritance | #coreinheritance |   #oopjavainheritance   1: What is inheritance?   A: Inheritance is the most important feature in any object-oriented programming language, This is a                child-parent relationship that allows as to reuse the same logic or same code in a specific manner.   2: How many types of inheritance are supported by java? A:  4 types of inheritance are supported by java,           Single-Level, Multi-Level, Hierarchical, Multiple. Note: In java multiple inheritance, we can achive through Interface.                                                                Single Level inheritance Multi-Level inheritance Hierarchical   inheritance

                                            1: which classes of collection framework that takes only homogeneous (same type) objects only. Ans: Only there are two classes that takes homogeneous elements those are TreeSet and TreeMap.                                                   2: How ArrayList work's internally? Ans:             Example :       ArrayList :     | 1 | 5 | 6 | 9 | 4 | 5 | 2 | 11 |      Size : 8      index : 0 - 7 arraylist is same as an array but it's dynamic array so, it increases it's size when required.    when you create a arraylist object initially it's size will be 10, and as you inter any value that  will go in in index 0 , and it's the starting index.      in the above example we have an arraylist that contains 8 elements and new it's full so if we try to insert more element in this list then automatically JVM create a new ArrayList and Copy all the data from this list and past it into the newly created list. and the size of the new l