COE 318 Quiz: COE 318 Fall 2017 Quiz 2

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turquoisegnu128

31 Jan 2019

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[5 marks] abstract public class parent { static int i; abstract void foo(); public class child extends parent { public static void main(string argv[]) { int[] array = new int[5]; for( i=0; i < array. length; i++ ) { System. out. println( array[i] ): a sequence of 5 0"s will be printed, compiler error: array is used before it is initialized, compiler error: child must be declared abstract. Solution: class data0 { private int m; public data0 d0; public data0(int num) { m = num; } dat0 public int get_val() { return m+d0. m; } //class data0 class data1 extends data0 { null private int n; public data1(int x, int y) { super(x); n = y; dat1 public int get_val() { return n+super. get_val(); } //class data1 public class review { public static void main(string[] args) { Data1 dat1 = new data1(1,2); dat0. d0 = new data0(3); dat1. d0 = new data1(4,5); dat1. d0. d0 = new data0(6); System. out. println(dat1. d0. get_val()); m:4 d0 m:6 d0 m:1 d0 d0 n:2 n:5.

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17. What does the following piece of code print? public class Test public static void main(String[] args) int[] a = {2,4,6,8); for(int i = 0; i < a.length; i++) int() b = foo (a); System.out.print( b[i] + " "); public static int[] foo (int[] array) for (int i = 0; i < array.length; i++) array[i]++; return array; (A) 3 579 (B) It would give compile-time error. (C) 3 6 9 12 (D) It would give run-time error. (E) 2468

COMP 2021Winter 2010 - Final Examination Pape 11 110 6 . The two classes low compile without me. What is displayed when the main() method of class Nightmareix is executed? Clearly indicate the program output in the appropriate space ca pe You may use the other lank space as a scratch pad to track the state of memesy as the program escoles, but the contents of this other space will not he graded The definition of the Pair claw public cla Pair private int left: private int right publie Pairintit T left- right - public void nix (Pair pl loft - P.left public string toitring) return "IL... lort R right "1" The definition of the NightmareMix class public class Nightmareix public static void mix Inta (int il, int 12) public static void mixArraywithint fint 11 a, int i, int v) 11 - V public static void mixArrayaor Int(int il al, intl a2) public static void mixMatrixWithint fint 11111121 - m int 11, int 12, int v public static void mixMatrix WithArray (int 11 11- , int i, intila) public static void mixlar Addresses Pair pl, Pair 2) pl - p2 public static void mixArrayWithPairState (Pair) a, int i, Pair pl public static void mixArrayWithPairAddress (Pairla, int i, Pair p) ali - P; public static void mixArrayaoraira (Pairil al, Pairil a2) public static void main(Stringil arga) int myV1 - 1; int myV2 - 2; int my = (3, 4) int my2 = 5, 6) into myM1 , 8 9, 10}} Pair myP1 = new Pair (11, 12) Pair myP2 = new Pair (13, 14) Pair myPA (neu Pair (15, 16), new pair(17, 18) Pair myPA2 = (neu Pair (19, 20), new pair (21, 22) mixInita (myvi, myV2); mixArrayWith Int (myal, 0, myv2); mixArraysOfIntinyal, myA2); MixMatrixWithint (myM, 0, 0, myV2); mixArrayaofTnt (HyMIO, myM[1); mixMatrixWithArray (wy, , WyA2); mixArraywithint nyA2, 0, myV2); mixPair Addresses (wypi, myP2); RixPairAddren (HyPALIO), WPAI[1]); mixArraywithPairstate (myPA2, 0, 1); mixArraywithPairAddresa (myPA2, 1, WP2); mixArray Paira (wyPal, myPAZ) System.out.println("1.. myvi) System.out.println("2: ( +WA110 A11] + " ") System.out.println("3: ( + myA2[0] + + m 2 (1) + " ); System.out.println("4: ( myM[0][0] + "," myM[0][1] + " myM[1][0] + " " + myM[1][1] + "} ") System.out.println('5: ( + myPA10) + myPA [1] + " "); System.out.println("6: ( myPA2[0 PA21] + " ); 1"

(c) Consider the following class: public class Student Grades private int ( grades; 1/loads values into grades from a file public void initializeFromFile(String filename) ....! //gets the total number of grades entered public int get NumRecords () (....) public class WebCT 1 public static void main(String[] args) Student Grades grades = new Student Grades(); grades.initializeFromFile("records. L.sv"); System.out.println("There are " + grades.length file.") " grades in that The goal of the program is to load the files and then print the total number of grades in the file. However, when you try to compile the above classes, you get the following error: WebCT.java:5: cannot find symbol symbol : variable length location: class Student Grades System.out.println("There are " + grades.length + " grades in that file." Explain why the crror occurs and write the code to fix it (while maintaining the intended functionality).

COE 318 Quiz: COE 318 Fall 2017 Quiz 2

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