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CS 113 PRACTICE FINAL There are 13 questions on this test The value of each question is 1 10 multiple choice 4 pt 11 13 coding problems 20 pt You may get partial credit for questions 11 13 If you finish early use the extra time to double check your work You may use the summary of Java language elements that is provided You may not use notes books or electronic devices of any sort All cell phones and other mobile devices must be turned off during the exam Good luck Name Section Student ID Answers for Questions 1 to 10 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 EXAM SCORES Q1 Q10 Q11 Q12 Q13 TOTAL MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers the question 1 What is the output of the following code public class Test public static void main String args String s1 new String Java String s2 new String Java System out print s1 s2 s1 equals s2 A false false B true true C false true D true false E None of the above 2 Given the following program public class Test public static void main String args for int i 0 i args length i System out print args i What is the output if you run the program using java Test 1 2 3 A 3 B 1 2 3 C 1 2 D 1 E None of the above array named values A values 0 length B values length C values length D values 0 length E values getColumnLength 3 Which of the following statements represents the number of columns in a regular two dimensional E 4 Analyze the following code public class Test public static void main String args A a new A 3 System out println a s public class A private String s public A String s this s s public void print System out println s 5 What is the output of the following code int myList 1 5 5 5 5 1 int max myList 0 int indexOfMax 0 for int i 1 i myList length i if myList i max max myList i indexOfMax i System out println indexOfMax A 0 B 1 C 2 D 3 E 4 A The program has a compile error because System out println method cannot be invoked from a B The program will display 3 C The program has a compile error because s has not been initialized D The program has a compile error because you cannot create an object from the class that method defines the object E The program has a compile error because s cannot be accessed directly outside class A Answer 6 Given the classes below show the output of the following program execution public class SmallNumberException extends Exception public class test Sets up exception object with a particular message SmallNumberException String message super message static public void main String args final int MIN 0 String values 7 3 this 5 SmallNumberException problem new SmallNumberException Too small for int i 0 i values length i try if Integer parseInt values i MIN throw problem System out print Integer parseInt values i 2 catch SmallNumberException e System out println e getMessage catch NumberFormatException e System out println not a number 1 1 not a number 7 Analyze the following code public class Test public static void main String args int x new int 5 int i for i 0 i x length i x i i System out println x i A The program displays 0 1 2 3 4 B The program displays 4 C The program has a runtime error because the last statement in the main method causes ArrayIndexOutOfBoundsException D The program has a compile error because i is not defined in the last statement in the main method E None of the above 8 What is the output of the following code class Test try public static void main String args System out println Welcome to Java int i 0 int y 2 i System out println Welcome to Java catch ArithmeticException e System out println Exception handled System out println End of the block Welcome to Java Exception handled End of the block E A The program displays Welcome to Java three times followed by End of the block B The program displays Welcome to Java two times followed by Exception handled C The program displays Welcome to Java two times followed by End of the block D The program displays Welcome to Java and End of the block E None of the above 9 Show the output of the following code public class Test public static void main String args int x 1 2 3 4 5 increase x int y 1 2 3 4 5 increase y 0 System out println x 0 y 0 public static void increase int x for int i 0 i x length i x i public static void increase int y y A 0 0 B 1 1 C 2 2 D 2 1 E 1 2 10 Consider the following class definitions public class Employee public class SalariedEmployee extends Employee Which of the following is incorrect E A SalariedEmployee is a subclass of Employee B Employee is a superclass of SalariedEmployee C SalariedEmployee inherits all properties and methods of Employee D Employee is a subclass of java lang Object E Employee does not inherit from Object example equals Write your answer in the space provided 11 Write the definition for a child class of Circle named Cylinder The cylinder should have a double attribute named height The constructor of the child class should take parameters to initialize the attributes The class Cylinder should also include getter and setter method as well as an equals method that returns true if two cylinder objects have same dimensions and false otherwise Remember to override method where needed public class Circle protected double radius public Circle double r radius r public class Cylinder extends Circle public Cylinder double r double h public void setRadius double r radius r public double getRadius return radius public double area return Math PI radius radius public String toString return Circle Radius radius getter setter for height public double getHeight return this height public void setHeight double h public boolean equals Cylinder other return other getRadius this radius other height this height override the area method public double area override the toString method return Cylinder with radius radius and height height 12 Implement a method called eStatistics that takes an array of strings called names The method returns an array that contains the frequencies of letter e in every string in the original array For example if names Monday Tuesday Wednesday Thursday Friday Saturday Sunday the method returns the array 0 1 2 0 0 0 0 public int eStatistics String names int freqs new int names length for int i 0 i names length i for int c 0 c names i length c freqs i count return freqs int count names i length names i replace e length 13 Implement a recursive method named power that takes 2 integer parameters …


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NJIT CS 113 - PRACTICE FINAL

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