AP计算机科学A 2021年真题 附答案和评分标准 AP Computer Science A 2021 Real Exam with Answers and Scoring Guidelines.pdfVIP

2021 ® AP Computer Science A Free-Response Questions © 2021 College Board. College Board, Advanced Placement, AP, AP Central, and the acorn logo are registered trademarks of College Board. Visit College Board on the web: collegeboard.org. AP Central is the official online home for the AP Program: apcentral.collegeboard.org. AP® Computer Science A 2021 Free-Response Questions COMPUTERSCIENCEA SECTIONII Time—1 hourand 30 minutes 4 Questions Directions: SHOW ALL YOUR WORK. REMEMBER THATPROGRAMSEGMENTS ARE TOBE WRITTENINJAVA. Youmayplanyouranswersinthisorangebooklet,butnocreditwillbegivenforanything writteninthisbooklet. YouwillonlyearncreditforwhatyouwriteintheseparateFreeResponsebooklet. Notes: • AssumethattheclasseslistedintheJavaQuickReferencehavebeenimportedwhereappropriate. • Unless otherwise noted in the question, assume that parameters in method calls are not null and that methods arecalledonlywhentheirpreconditionsaresatisfied. • Inwritingsolutionsforeachquestion,youmayuseanyoftheaccessiblemethodsthatarelistedinclassesdefined inthatquestion. Writingsignificantamountsofcodethatcanbereplacedbyacalltooneofthesemethodswillnot receivefullcredit. GO ON TO THE NEXT PAGE. © 2021 College Board. Visit College Board on the web: collegeboard.org. 2 AP® Computer Science A 2021 Free-Response Questions 1. This question involves the WordMatch class, which stores a secret string and provides methods that compare other strings to the secret string. You will write two methods in the WordMatch class