ap computer science a exam 2020 cheat sheet

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Java Quick Reference

AP Computer Science A Java Quick Reference Author: College Board Subject: AP Computer Science A Java Quick Reference Keywords: AP Computer Science A Java Quick Reference; 2020 Updates; teacher resources; exam resources; course resources; student resources; exam information; course information; Created Date: 4/17/2019 8:31:51 PM

PDF	Quick Reference AP Computer Science A Appendix A Java Quick Reference Appendix B Testable API Appendix C Testable

What is AP Computer Science a?
AP Computer Science A is an introductory college-level computer science course. Students cultivate their understanding of coding through analyzing, writing, and testing code as they explore concepts like modularity, variables, and control structures. This is the core document for this course.
What percentage of AP Computer Science a questions cover 2D arrays?
About 7.5–10% of the questions on your exam will cover 2D Arrays. two-dimensional (2D) array is an array of arrays, often thought of as a rectangular array of values, with rows and columns. For the purposes of AP Computer Science A, all 2D arrays are rectangular, so that each row has the same length.
What percentage of AP exam questions cover Java objects?
On your AP exam, 5–7.5% of questions will cover the topic Using Objects. As mentioned, all values in Java belong to either a primitive type or a reference type.

Content of Appendixes

Appendix A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Java Quick Reference Appendix B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Testable API Appendix C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Testable

class java.lang.Integer

Integer(int value) int intValue() Integer.MIN_VALUE Integer.MAX_VALUE secure-media.collegeboard.org

class java.lang.Math

static int abs(int x) static double abs(double x) static double pow(double base, double exponent) static double sqrt(double x) static double random() secure-media.collegeboard.org

class (implements Comparable)

public Location(int r, int c) constructs a location with given row and column coordinates public int getRow() returns the row of this location public int getCol() returns the column of this location public Location getAdjacentLocation(int direction) returns the adjacent location in the direction that is closest to direction public int getDire

info.gridworld.grid.Grid interface

int getNumRows() returns the number of rows, or -1 if this grid is unbounded int getNumCols() returns the number of columns, or -1 if this grid is unbounded boolean isValid(Location loc) returns true if loc is valid in this grid, false otherwise Precondition: loc is not null put(Location loc, E obj) puts obj at location loc in this grid and ret

class (extends Actor)

public Rock() constructs a black rock public Rock(Color rockColor) constructs a rock with color rockColor public void act() overrides the act method in the Actor class to do nothing info.gridworld.actor.Flower class (extends Actor) public Flower() constructs a pink flower public Flower(Color initialColor) constructs a flower with color initia

Bug.java

package info.gridworld.actor; import info.gridworld.grid.Grid; import info.gridworld.grid.Location; import java.awt.Color; /** * A Bug is an actor that can move and turn. It drops flowers as it moves. The implementation of this class is testable on the AP CS A and AB Exams. */ public class Bug extends Actor { /** * Constructs a red bug. */ publ

BoxBug.java

import info.gridworld.actor.Bug; /** * A BoxBug traces out a square “box” of a given size. The implementation of this class is testable on the AP CS A and AB Exams. */ public class BoxBug extends Bug { private int steps; private int sideLength; /** * Constructs a box bug that traces a square of a given side length. * @param length the side lengt

Critter.java

package info.gridworld.actor; import info.gridworld.grid.Location; import java.util.ArrayList; /** * A Critter is an actor that moves through its world, processing other actors in some way and then moving to a new location. Define your own critters by extending this class and overriding any methods of this class except for * When you override the

ChameleonCritter.java

import info.gridworld.actor.Actor; import info.gridworld.actor.Critter; import info.gridworld.grid.Location; import java.util.ArrayList; /** * A ChameleonCritter takes on the color of neighboring actors as it moves through the grid. The implementation of this class is testable on the AP CS A and AB Exams. */ public class ChameleonCritter extends Cr

Location Class (implements Comparable)

public Location(int r, int c) public int getRow() public int getCol() public Location getAdjacentLocation(int direction) public int getDirectionToward(Location target) public boolean equals(Object other) public int hashCode() public int compareTo(Object other) public String toString() NORTH, EAST, SOUTH, WEST, NORTHEAST, SOUTHEAST, NORTHWEST, SOUTH

Grid Interface

int getNumRows() int getNumCols() boolean isValid(Location loc) put(Location loc, E obj) remove(Location loc) get(Location loc) ArrayList getOccupiedLocations() ArrayList getValidAdjacentLocations(Location loc) ArrayList getEmptyAdjacentLocations(Location loc) ArrayList getOccupiedAdjacentLocations(Location l

Actor Class

public Actor() public Color getColor() public void setColor(Color newColor) public int getDirection() public void setDirection(int newDirection) public Grid getGrid() public Location getLocation() public void putSelfInGrid(Grid gr, Location loc) public void removeSelfFromGrid() public void moveTo(Location newLocation) public void act(

Rock Class (extends Actor)

public Rock() public Rock(Color rockColor) public void act() secure-media.collegeboard.org

Flower Class (extends Actor)

public Flower() public Flower(Color initialColor) public void act() secure-media.collegeboard.org

Bug Class (extends Actor)

public Bug() public Bug(Color bugColor) public void act() public void turn() public void move() public boolean canMove() secure-media.collegeboard.org

Critter Class (extends Actor)

public void act() public ArrayList getActors() public void processActors(ArrayList actors) public ArrayList getMoveLocations() public Location selectMoveLocation(ArrayList locs) public void makeMove(Location loc) secure-media.collegeboard.org

ChameleonCritter Class (extends Critter)

public void processActors(ArrayList actors) public void makeMove(Location loc) secure-media.collegeboard.org

Appendix G — Index for Source Code

This appendix provides an index for the Java source code found in Appendix C. secure-media.collegeboard.org

C5 C5 C5

getActors() processActors(ArrayList actors) getMoveLocations() selectMoveLocation(ArrayList locs) makeMove(Location loc) secure-media.collegeboard.org

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PDF	AP Computer Science A Study Guide On your AP exam 5–7.5% of questions will cover the topic Using Objects. As mentioned

PDF	AP Computer Science A 2021 Free-Response Questions Assume that the classes listed in the Java Quick Reference have been imported where appropriate. Unless otherwise noted in the question assume that parameters

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PDF	Resource AP Computer Science A Java Quick Reference—2020 Java Quick Reference Accessible methods from the Java library that may be included in the exam Class Constructors and Methods Explanation String Class

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