0% 0 votes, 0 avg 23 1234567891011121314151617181920 This quiz randomly generates 20 questions as asked in AP Computer Science A (AP CSA) - Programming in Java. Congratulations! AP Computer Science A (AP CSA) - Programming in Java This quiz randomly generates 20 questions (in 30 mins) as asked in AP Computer Science A (AP CSA) - Programming in Java. 1 / 20 Question Only when x < y Only when x ≤ y Only when x > y For all values of x and y The method will never cause a stack overflow. 2 / 20 Question An ArithmeticException will be thrown. A syntax error will occur. statement1, but not statement2, will be executed. statement2, but not statement1, will be executed. Neither statementl nor statement2 will be executed; control will pass to the first statement following the if statement. 3 / 20 Refer to the Point, Quadrilateral, and Rectangle classes below: Which statement about the Quadrilateral class is false? The perimeter and area methods are abstract because there's no suitable default code for them. The getLabels method is not abstract because any subclasses of Quadrilateral will have the same code for this method. If the Quadrilateral class is used in a program, it must be used as a super- class for at least one other class. No instances of a Quadrilateral object can be created in a program. Any subclasses of the Quadrilateral class must provide implementation code for the perimeter and area methods. 4 / 20 A middle school is expanding to open a high school next year, doubling the total number of students. The school keeps a database in which each student's unique ID number is stored as an 8 bit number called studentID. Before the arrival of the new students almost every 8 bit number has already been assigned to a student. Of the options provided below, which is the smallest change to the way studentID is represented necessary to ensure each incoming student receives a unique ID? Add a bit to studentID to double the number of IDs that the database can represent. Double the number of bits in studentID to double the number of IDs that the database can represent Keep using an 8-bit number for studentID but reserve the first bit to indicate middle school or high school. Remove a bit from studentID to make room for incoming students Four words become HiHowAreYou, since its length is more than 4, nothing will be removed and HiHowAreYou removed will be printed. 5 / 20 What is the output? Compilation fails. The program compiles, but it prints nothing. HiHowAreYou removed An UnsupportedOperationException is thrown at runtime. 6 / 20 What is the output? Compilation fails at line n2. Compilation fails at line n1 20:20 10:20 7 / 20 8 bits is enough to represent 256 different numbers. How many total bits do you need to represent 512 (twice as many) numbers? 9 bits 10 bits 16 bits 17 bits 8 / 20 What will be the output? True False Compile Error Runtime Error It is Palindrome function. A palindrome program checks if a given input (number or string) reads the same forwards and backward. The core logic involves reversing the input and comparing it to the original. If they match, it's a palindrome; otherwise, it's not. 9 / 20 Question If the array is initially sorted in descending order, then insertion sort will be more efficient than selection sort. The number of comparisons for selection sort is independent of the initial arrangement of elements. The number of comparisons for insertion sort is independent of the initial arrangement of elements. The number of data movements in selection sort depends on the initial arrangement of elements. The number of data movements in insertion sort is independent of the initial arrangement of elements. 10 / 20 Question I and II are exactly equivalent for all input values n. I and II are exactly equivalent for all input values n ≥ 1, but differ when n≤ 0. I and Il are exactly equivalent only when n = 0. I and I are exactly equivalent only when n is even. I and Il are not equivalent for any input values of n. 11 / 20 What is the output? A B C A B C D E A B D E Compilation fails. 12 / 20 What is the output ? -3 4 5 6 3 4 3 6 5 4 5 6 3 6 4 6 13 / 20 What is the output? 1 2 3 0 01 2 3 0 0 An Exception is thrown at run time. 1 2 3 0 01 2 3 1 2 31 2 3 14 / 20 Question 32 225 255 256 272 15 / 20 Which statement is true about the switch statement? It must contain the default section. The break statement, at the end of each case block, is optional. Its case label literals can be changed at runtime. Its expression must evaluate to a collection of values. The switch statement in Java provides a way to control program flow by executing different blocks of code based on the value of a single expression. It offers an alternative to using multiple if-else if-else statements, often leading to more readable and concise code for handling multiple conditional branches. 16 / 20 Question I only II only III only I and II only I, II , and III 17 / 20 Question Which of the following correctly constructs a Date object? Date d = new(2, 13, 1947); Date d = new Date(2, 13, 1947); Date d; d = new(2, 13, 1947); Date d; d = Date(2, 13, 1947); Date d = Date(2, 13, 1947); 18 / 20 Consider the following loop, where n is some positive integer. n / 2 (n + 1) / 2 n n - 1 (n -1) / 2 19 / 20 Question It is not possible to separate n into digits without the help of a temporary variable. nRemaining prevents the parameter num from being altered. nRemaining enhances the readability of the algorithm. On exiting the method, the value of nRemaining may be reused. nRemaining is needed as the left-hand side operand for integer division. 20 / 20 Which code fragment, when inserted at line 6, enables the code to print true? String str2 = str1; String str2 = new String(str1); String str2 = sb1.toString(); String str2 = "Duke"; Your score is 0% Restart quiz
