--- title: "AP Computer Science A ArrayList FRQ Practice" description: "26 Data Analysis with ArrayList questions written in the AP format, each scored part by part." canonical: "https://fiveable.me/ap-comp-sci-a/frqs/arraylist" type: "frq-type-practice" subject: "AP Computer Science A" --- # AP Computer Science A ArrayList FRQ Practice ## What the ArrayList FRQ asks Data Analysis with ArrayList is FRQ 3 on the AP Computer Science A exam. You write one method that loops through an ArrayList of objects, filters them by one or more conditions, and returns a result like a count, sum, average, or maximum. - **90 min**: for all four FRQs - **5 points**: the fewest of the four FRQs - **45%**: of your score, for all four FRQs | Part | What it asks | Points | | --- | --- | --- | | A: One method | Five one-point checks, such as traversing the list, conditions on its objects, tracking a result, and the return value | 5 | ## How ArrayList FRQ practice works 1. **Read the full question.** The provided classes, the ArrayList, and the method you write, laid out the way the exam shows them. 2. **Write on a 23-minute timer.** A pace that fits all four questions into the 90-minute section. Pause it or turn it off, and your response saves as you go. 3. **Submit for a score out of 5.** Your response is scored against the scoring guidelines written for that question. Your first score is included. ## All 26 questions ### Unit 4: Data Collections (26) - [Temperature averaging with conditional filtering criteria](/ap-comp-sci-a/frq-practice?id=696fff71186db24911b37789&type=frq-3-data-analysis-with-arraylist) - [Weather data filtering and average calculation](/ap-comp-sci-a/frq-practice?id=698a7802f06ff587401ec912&type=frq-3-data-analysis-with-arraylist) - [Average pages by genre in collection](/ap-comp-sci-a/frq-practice?id=698a7850f06ff587401ec915&type=frq-3-data-analysis-with-arraylist) - [Weather data filtering and averaging calculations](/ap-comp-sci-a/frq-practice?id=698a78abf06ff587401ec918&type=frq-3-data-analysis-with-arraylist) - [Weather data filtering by precipitation threshold](/ap-comp-sci-a/frq-practice?id=698a790af06ff587401ec91a&type=frq-3-data-analysis-with-arraylist) - [Object filtering and average price calculation](/ap-comp-sci-a/frq-practice?id=698a796df06ff587401ec91f&type=frq-3-data-analysis-with-arraylist) - [Average temperature filtering by precipitation threshold](/ap-comp-sci-a/frq-practice?id=698a79cef06ff587401ec922&type=frq-3-data-analysis-with-arraylist) - [Verified product reviews with minimum comment length](/ap-comp-sci-a/frq-practice?id=698a7a18f06ff587401ec926&type=frq-3-data-analysis-with-arraylist) - [Express order costs by target zip code](/ap-comp-sci-a/frq-practice?id=698a7a63f06ff587401ec929&type=frq-3-data-analysis-with-arraylist) - [Taxable items filtering and receipt calculation](/ap-comp-sci-a/frq-practice?id=698a7b40f06ff587401ec92f&type=frq-3-data-analysis-with-arraylist) - [Average movie ratings by genre filtering](/ap-comp-sci-a/frq-practice?id=698a7b99f06ff587401ec931&type=frq-3-data-analysis-with-arraylist) - [Student project finalist scores by subject](/ap-comp-sci-a/frq-practice?id=698a7bdcf06ff587401ec934&type=frq-3-data-analysis-with-arraylist) - [Average duration of open rides with minimum threshold](/ap-comp-sci-a/frq-practice?id=698a7c36f06ff587401ec938&type=frq-3-data-analysis-with-arraylist) - [Product filtering and discounted price generation](/ap-comp-sci-a/frq-practice?id=698a7ca6f06ff587401ec93a&type=frq-3-data-analysis-with-arraylist) - [Stock price fluctuation detection and alerts](/ap-comp-sci-a/frq-practice?id=698a7d09f06ff587401ec93e&type=frq-3-data-analysis-with-arraylist) - [Student honor roll average calculation with attendance criteria](/ap-comp-sci-a/frq-practice?id=698a7d49f06ff587401ec941&type=frq-3-data-analysis-with-arraylist) - [Average duration of non-explicit songs above rating threshold](/ap-comp-sci-a/frq-practice?id=698a7da0f06ff587401ec944&type=frq-3-data-analysis-with-arraylist) - [Flight cost calculation with duration constraints](/ap-comp-sci-a/frq-practice?id=698a7de1f06ff587401ec947&type=frq-3-data-analysis-with-arraylist) - [Average pages calculation for genre-matched books](/ap-comp-sci-a/frq-practice?id=698a7e27f06ff587401ec94b&type=frq-3-data-analysis-with-arraylist) - [Recurring donation amount filtering and averaging](/ap-comp-sci-a/frq-practice?id=698a7e79f06ff587401ec94d&type=frq-3-data-analysis-with-arraylist) - [Filtering workouts by type and distance criteria](/ap-comp-sci-a/frq-practice?id=6a8fa1631d29f427d08615ac&type=frq-3-data-analysis-with-arraylist) - [Sensor data threshold detection and alert generation](/ap-comp-sci-a/frq-practice?id=6a95bdacbe7dace4a055e1d5&type=frq-3-data-analysis-with-arraylist) - [Grouping consecutive sensor readings by identifier](/ap-comp-sci-a/frq-practice?id=6a95ca1fac65e35e5ad67fca&type=frq-3-data-analysis-with-arraylist) - [Sequential data validation and non-decreasing sequence enforcement](/ap-comp-sci-a/frq-practice?id=6a95cc28475322569b209bb7&type=frq-3-data-analysis-with-arraylist) - [Data smoothing through interpolation of outlier gaps](/ap-comp-sci-a/frq-practice?id=6a95ccb4475322569b209bbf&type=frq-3-data-analysis-with-arraylist) - [Sequential spam detection and paired message removal](/ap-comp-sci-a/frq-practice?id=6a95cdb9475322569b209bca&type=frq-3-data-analysis-with-arraylist) ## Sample question **Temperature averaging with conditional filtering criteria** Opening Text: 3. The DailyReading class represents weather data collected on a single day. A partial declaration of the DailyReading class is shown below. Helper Class Code: Language: java public class DailyReading { /** * Returns the temperature in degrees Fahrenheit */ public double getTemperature() { /* implementation not shown */ } /** * Returns the wind speed in miles per hour */ public double getWindSpeed() { /* implementation not shown */ } /** * Returns true if rain was recorded, false otherwise */ public boolean isRaining() { /* implementation not shown */ } /* There may be instance variables, constructors, and methods that are not shown. */ } Main Class Code: Language: java public class WeatherStation { /** The list of daily weather readings */ private ArrayList readings; /** * Returns the average temperature of readings that meet the specified criteria. * Precondition: minWind >= 0.0 * Postcondition: Returns the average temperature of readings where: * - The wind speed is greater than or equal to minWind * - AND (requireRain is false OR isRaining() is true) * Returns 0.0 if no readings meet the criteria. */ public double averageTempWithCondition(boolean requireRain, double minWind) { /* to be implemented */ } /* There may be instance variables, constructors, and methods that are not shown. */ } Task Description: Write the WeatherStation method averageTempWithCondition. This method calculates and returns the average temperature of the valid readings in the readings list. A reading is considered valid if it meets the wind speed requirement (at least minWind) and the rain requirement (if requireRain is true, the reading must be raining; if requireRain is false, the rain status does not matter). Data Table Intro: Suppose readings contains the following five DailyReading objects. Data Table: Headers: Index | 0 | 1 | 2 | 3 | 4 Temperature | 70.0 | 80.0 | 60.0 | 90.0 | 65.0 Wind Speed | 10.0 | 5.0 | 15.0 | 20.0 | 12.0 Is Raining | true | false | true | false | true Example Call: - Call: averageTempWithCondition(true, 11.0) - Return Value: 62.5 - Explanation: The method considers only readings where isRaining() is true AND wind speed is >= 11.0. Index 0 fails the wind condition (10.0 < 11.0). Index 1 and 3 fail the rain condition. Index 2 (Wind 15.0, Rain true) and Index 4 (Wind 12.0, Rain true) are valid. The average of their temperatures (60.0 and 65.0) is 62.5. Completion Instruction: Complete method averageTempWithCondition. Method Signature Block: Language: java /** * Returns the average temperature of readings that meet the specified criteria. * Precondition: minWind >= 0.0 * Postcondition: Returns the average temperature of readings where: * - The wind speed is greater than or equal to minWind * - AND (requireRain is false OR isRaining() is true) * Returns 0.0 if no readings meet the criteria. */ public double averageTempWithCondition(boolean requireRain, double minWind) ## Questions **How many responses can I get scored?** You can read every question without a plan. Your first scored response is included. A plan unlocks unlimited scoring. **Can I use brackets to get elements from the list?** No. This question uses an ArrayList, so access elements with get() and size(), or an enhanced for loop. Bracket syntax only works on arrays. **Do I build the ArrayList myself?** No. The question gives you the list, as an instance variable or a parameter. You loop through it, call methods on its objects, and return the result. **How is FRQ 3 different from FRQ 4?** FRQ 3 works with an ArrayList and is worth 5 points. FRQ 4 works with a 2D array, usually with nested loops, and is worth 6. **Can I type Java in the editor?** Yes. Type your code the way you would on the digital exam. The Java Quick Reference is available while you write. ## Related - [ArrayList FRQ exam guide](/ap-comp-sci-a/ap-computer-science-a-exam/ap-comp-sci-a-frq-3-data-analysis-with-arraylist/study-guide/ap-comp-sci-a-frq-3-data-analysis-with-arraylist) - [AP Computer Science A Methods FRQ practice](/ap-comp-sci-a/frqs/methods-and-control-structures) - [AP Computer Science A Class Design FRQ practice](/ap-comp-sci-a/frqs/class-design) - [AP Computer Science A 2D Array FRQ practice](/ap-comp-sci-a/frqs/2d-array) - [AP Computer Science A FRQs](/ap-comp-sci-a/frqs) - Any question by id: the `get_frq` tool on the [Fiveable MCP server](/mcp/docs) ## About This Document Canonical Fiveable pages are available as Markdown at the same path plus `.md`. - [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns - [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing - [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`) - [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`)