🔰 Java Abstraction : Data abstraction is the process of hiding certain details and showing only essential information to the user.
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🔰Java Interface : Interface को interface keyword के साथ define किया जाता है , और Inherit करने के लिए implements keyword का use किया जाता है।

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🔰Interface Program in Java: An interface is a set of rules or blueprints that a class must follow by implementing abstract methods and constants.

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🔰Java multiple inheritance : Multiple inheritance in Java refers to a scenario where a class can inherit properties and methods from more than one superclass.
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🔰Hybrid Inheritance : Hybrid Inheritance in Java is a combination of all inheritances. Single and hierarchical inheritances or multiple inheritance.

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🔰Anonymous class : जावा में Anonymous classes विशेष रूप से तब उपयोगी होती हैं जब आपको एक अलग क्लास को स्पष्ट रूप से परिभाषित किए बिना एक बार उपयोग वाली क्लास बनाने की आवश्यकता होती है।
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🔰Has-A Relationship : Aggregation is a fundamental concept in object-oriented programming. It focuses on the development of a Has-A relationship between two classes.

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🔰Difference between Abstract Class and Interface in Java : An abstract class can have a mixture of fully implemented methods and abstract methods (which are declared but not implemented) and can maintain state through fields. An interface can only declare…

🔰How to remove an element from ArrayList in Java?
Using the remove() method of the ArrayList class is the fastest way of deleting or removing the element from the ArrayList.
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🔰Java ArrayList removeIf() Method : Java ArrayList removeIf() Method :
The Java ArrayList removeIf() method removes all elements from the arraylist that satisfy the specified condition.

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🔰Custom ArrayList in Java : In this tutorial, we will learn how to store user-defined (custom) class objects in Java ArrayList in an easy way and step by step.
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🔰Java ArrayList sort() Method : This sort() method takes the collection to be sorted as the parameter and returns a Collection sorted in the Ascending Order by default.
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🔰What is the difference between add and addAll methods in ArrayList?
The difference is that you use a loop and "add" together to add one item at a time. But when you use "addAll" you add an entire collection at once and you don't need a loop.

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🔰What is retainAll in ArrayList?
The Java ArrayList retainAll() method retains only those elements in the arraylist that are also present in the specified collection.

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🔰 Java ArrayList isEmpty() Method : The Java ArrayList isEmpty() method returns true if this list contains no elements. This method always returns the result as per the current state of the list.
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🔰 Serialize and Deserialize an ArrayList : In Java, ArrayList class is serializable by default. It essentially means that we do not need to implement Serializable interface explicitly to serialize an ArrayList. We can directly use ObjectOutputStream to serialize…

🔰 What is LinkedList class in Java?
A linked list in Java is a dynamic data structure whose size increases as you add the elements and decreases as you remove the elements from the list.
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🔰 Java LinkedList listIterator() Method : The Java LinkedList listIterator(index) method returns an list iterator over the elements in this list, starting at specified point.

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🔰 Java LinkedList listIterator() Method : The Java LinkedList listIterator(index) method returns an list iterator over the elements in this list, starting at specified point.

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🔰LinkedList for loop : Using enhanced for loop we can sequentially iterate a LinkedList. The execution of the enhanced for loop ends after we visit all the elements.
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