--- title: Crack the Android Memory Interview: How Kotlin Objects... description: A step-by-step walkthrough of how Kotlin objects are stored in memory on Android, covering the ART runtime's three memory regions: Method Area (class... canonical: https://daily.dev/posts/crack-the-android-memory-interview-how-kotlin-objects-live-in-stack-heap-method-area-e4x9j3zex twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Crack the Android Memory Interview: How Kotlin Objects Live in Stack, Heap & Method Area | daily.dev og:description: A step-by-step walkthrough of how Kotlin objects are stored in memory on Android, covering the ART runtime's three memory regions: Method Area (class... og:url: https://daily.dev/posts/crack-the-android-memory-interview-how-kotlin-objects-live-in-stack-heap-method-area-e4x9j3zex og:image: https://api.daily.dev/og/posts/e4X9j3zeX.png og:image:alt: Crack the Android Memory Interview: How Kotlin Objects Live in Stack, Heap & Method Area og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Crack the Android Memory Interview: How Kotlin Objects Live in Stack, Heap & Method Area **[Medium](https://daily.dev/sources/medium_js)** · 11 min read · 0 upvotes · 0 comments ## Summary A step-by-step walkthrough of how Kotlin objects are stored in memory on Android, covering the ART runtime's three memory regions: Method Area (class blueprints, static metadata), Heap (object instances), and Stack (local variables and method frames). Uses a Dog class example to trace each execution step from app launch through garbage collection. Also covers primitives vs references, String pool behavior, static vs instance variables, abstract classes, interfaces, and common interview questions about memory layout. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#android](https://daily.dev/tags/android), [#kotlin](https://daily.dev/tags/kotlin), [#jvm](https://daily.dev/tags/jvm) [View this post on daily.dev](https://daily.dev/posts/crack-the-android-memory-interview-how-kotlin-objects-live-in-stack-heap-method-area-e4x9j3zex) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Crack the Android Memory Interview: How Kotlin Objects Live in Stack, Heap & Method Area","url":"https://daily.dev/posts/crack-the-android-memory-interview-how-kotlin-objects-live-in-stack-heap-method-area-e4x9j3zex","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/crack-the-android-memory-interview-how-kotlin-objects-live-in-stack-heap-method-area-e4x9j3zex"},"datePublished":"2026-07-18T19:32:53.788Z","dateModified":"2026-07-18T19:33:49.384Z","description":"A step-by-step walkthrough of how Kotlin objects are stored in memory on Android, covering the ART runtime's three memory regions: Method Area (class...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/493b07a0c67aec82d95960f37b19e3a8?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/493b07a0c67aec82d95960f37b19e3a8?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Medium","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Medium","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/medium","url":"https://daily.dev/sources/medium_js"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/crack-the-android-memory-interview-how-kotlin-objects-live-in-stack-heap-method-area-e4x9j3zex","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"android,kotlin,jvm","timeRequired":"PT11M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Medium","item":"https://daily.dev/sources/medium_js"},{"@type":"ListItem","position":3,"name":"Crack the Android Memory Interview: How Kotlin Objects Live in Stack, Heap & Method Area"}]} ```