Collections A container for storing multiple objects. Arrays: Fixed length after initialization 1. Collection Categories Single-Column Collections: Store individual elements Examples: 1 2 3; Alice Bob Dual-Column Collections: Store key-value pairs Examples: name:Alice; age:11 2. Collection Hierarchy...
Core Java Syntax & Language Features Which 8 primitive data types does Java support? How do reference equality (==) and logical object equality (equals()) differ? Explain the distinct roles of final, finally, and finalize(). What happened to finalize() in modern Java versions? What behaviors do...
The Java Collections Framework provides implementations of fundamental data structures and algorithms. These components facilitate data storage and manipulation through various collection types including lists, sets, queues, and maps. First-In-First-Out (FIFO) represents a queue data structure where...
Iterating over Map implementations requires selecting appropriate strategies based on whether you need keys, values, or both, alongside considerations for concurrent modification and Java version compatibility. Entry-Based Traversal Accessing both keys and values simultaneously through entrySet() of...
Kotlin Collections Overview Kotlin's kotlin.collections package provides three primary collection types: List (ordered), Set (unordered, unique elements), and Map (key-value pairs). A collection defined with val is immutable in its reference, not necessarily its content. You can modify a mutable col...
Update objects inside a list while still performing downstream stream operations, and clarifies how Stream.forEach, Collection.forEach, and Stream.peek differ. Model used in examples package com.example.model; public class Person { private Integer id; private String fullName; private int age; public...