Questions and Answers of Introduction To Programming With Java A Problem Solving Approach

You must use a for-each loop, and not a traditional for loop, whenever you need to iterate through a collection of elements. (T / F)
The index number of the last element in an array of length 60 is _______.
Declare an array named zipCodes that holds int values.
Provide a single initialization statement that initializes all the elements in a 4-element array called ids to −1, where ids is an array of long elements.
Pond Program:As part of your internship at Parkville’s Parks and Recreation Department, you’ve been asked to write a program that keeps track of pond life. Your program doesn’t have to do
Assume that this code fragment compiles and runs. What is its output? Be precise when showing your output. int[] x = new int [4]; int[] y; for (int i=0; i
Given the following allPrices initializer, provide a declaration statement for an suvPrices array such that the new array is half the size of the allPrices array. You can assume that there are an
The following program is supposed to reverse the elements in the scientists array. It compiles and runs, but it doesn’t work properly.The reversal does not occur. Fix the problem by rewriting the
Write a program that performs a one-position left rotation of the elements in an array. Demonstrate the effect by having the program rotate the elements in this particular array:String[] scientists
Given the following list array, use the selection sort algorithm to sort the array. Show each step of the selection sort process. Do not provide code; just show pictures of the list array after each
The insertion-sort algorithm provides an alternative to the selection-sort algorithm for sorting something like a hand of cards, where there is a small number of items (about 20 or less). It’s more
Write a program that uses the sort method in the Java Arrays class to sort the elements in an array of String elements in alphabetical order. Use this array: String[] friends {"Sheldon", "Amy",
Write a single statement that initializes a two-dimensional array named rectangles with double elements. Provide one row for each of three rectangles and give each row two columns, one for width and
As you learned earlier, a two-dimensional array is actually a one-dimensional array of references to other (subordinate) one-dimensional arrays, which may be of different lengths. The following
The programming term mask refers to an array or 0’s and 1’s that is built from another array, such that if any element in the other array satisfies some criterion, the corresponding mask element
Modify the SalesClerks program so the SalesClerk array length always equals the current number of sales clerks. That means the initial length of the SalesClerks array should be zero. Because the
Given the following program skeleton that stores information about the characters in the Big Bang Theory television show. Replace the line with code that implements a displayActor method. The method
In this chapter’s FlightTimes class, modify the displayFlightTimesTable method by converting the two for loops that iterate over the columns, so that they use for-each loops instead.There’s no
How is an ArrayList more versatile than an array?
To avoid runtime errors, you must always specify the size of an ArrayList when you declare it. (T / F)
What is the return type of the ArrayList class’s get method?
If you call the ArrayList method, add(i, x), what happens to the element originally at position i?
Specifically, under what circumstances does autoboxing take place?
Write one statement that appends the double value, 56.85, to the end of an existing ArrayList called prices.
Write one statement that displays all of the values in an ArrayList of Doubles called prices. Put the complete list in square brackets and use a comma and a space to separate different values in the
What is an anonymous object?
Given:• You have a WeatherDay class that stores weather information for a single day.• You like to store WeatherDay objects for a whole year.• The primary task of your program is to create
Where does the JVM start the process of trying to access an element in the interior of a linked list?
Based on what you have learned so far, what is a Java interface?
For a given set of inputs, the execution time of a given program is always the same. (T / F)
When we remove an element from the center of an ArrayList, higher-index elements must shift downward. That shifting is not needed when we remove an element from a linked list. Why then does it
Because an ArrayDeque is based on an array, when you remove an element from the front of an ArrayDeque, the computer must shift all higher elements down by 1. (T / F)
What is the difference between a queue and a stack?
What are the interfaces at the tops of the two interface hierarchies in the Java collections framework?
What is a set?
Why don’t we use a constructor parameter to establish the ID of a Citizen?
What do the following abbreviations mean? (a) I/O (b) CPU (c) RAM (d) GHz (e) MB.
Assertions: (a) Main memory is faster than auxiliary memory. (T / F) (b) Auxiliary memory is volatile. (T / F) (c) The first position in main memory is at address 1. (T / F) (d) The CPU is
(This exercise assumes your computer contains a Hello.java file like that in Figure 1.6. If not, use a plain text editor to create such a file.) On a computer whose operating system is a recent
Write pseudocode for an algorithm that(1) asks the user to input the base and height of a triangle in meters,(2) computes the triangle’s area, and(3) prints the triangle’s area. Use the following
Some programming languages permit arbitrary flow of control from any place in a program to any other place in the program. Not Java. What is the rationale for Java not allowing that?
Given the following pseudocode, circle the statements that are considered to be within the body of the while loop: input time Remaining while time Remaining > 3 { print time Remaining time Remaining
In exercise 3, suppose the user’s input for time Remaining is 10. How many lines of output will the algorithm generate?Exercise 3Given the following pseudocode, circle the statements that are
Trace the following algorithm. The book presents two ways to do tracing—a short form and a long form. To give you a head start, the setup for the short form and also the long form are given below.
Trace the following algorithm. The book presents two ways to do tracing—a short form and a long form. To give you a head start, the setup for the short form and also the long form are given below.
What does this chapter’s Dream.java program do?
What are the filename extensions for Java source code and bytecode, respectively?
Why does source code have comments?
For a file with a public class, the program’s filename must match the program’s class name except that the filename has a .java extension added to it. (T / F)
Standard coding conventions dictate that class names start with a lowercase first letter. (T / F)
In Java, the case of a character does matter. (T / F)
A program’s start-up method, main, should be in a class that is public. (T / F)
The main method itself must be public. (T / F)
From your memory alone (don’t look for the answer in the book), write the main method heading.
Identify two types of groupings that must be enclosed in braces.
From your memory alone (don’t look for the answer in the book), write the statement that tells the computer to display this string of text:Here is an example
List all of the types of characters that may be used to form an identifier.
List all of the types of characters that may be used as the first character of an identifier.
You should abbreviate variable names by omitting vowels, in order to save space. (T / F)
Why is it good practice to use a separate line to declare each separate variable?
There must be a semicolon after every assignment statement. (T / F)
Initialization “kills two birds with one stone.” What are the “two birds”?
Illustrate the two ways to provide comments in a Java program by writing the following as comments. Use a different comment format for each of the two sentences. This is a relatively long sentence
Why does public static void main(string[] args) generate an error?
Identify two uses for braces.
What does each of the following programs do?a) The Java compiler?b) Java virtual machine (JVM)?
In Java, how do we write multiple-word identifiers?
For each of the below variable names, indicate (with y or n) whether it’s legal and whether it uses proper style. Note: You may skip the style question for illegal variable names because style is
Each variable must be declared in a separate statement. (T / F)
If an algebraic expression includes a number like 0.47, what type does the computer assume it is, a float or a double?
Use 1.7320508075688772 in the declaration of a named constant that represents the square root of 3.
Write the following mathematical expressions as legal Java expressions: b) 5 7.5x-(3.5+ y) 18x
Assume this:Evaluate each of the following expressions by hand. Show your work, using a separate line for each evaluation step. Check your work by writing and executing a program that evaluates these
Type Casting: Assume the following declarations:Rewrite those of the following statements which would generate a compile- time error using an appropriate cast that makes the error go away. Do not
Assuming that tab stops are 4 columns apart, what output does the following statement generate? System.out.println("\"files: \" \tE:\\code\\Hello.java");
What’s wrong with this statement? string programming Pioneer = "Admiral Grace Hopper";
Assume that you have a string variable named lastName. Provide a code fragment that prints lastName's first character.
What does this code fragment print? Strings"bean"; s+- "bag"; System.out.println(s. equals("beanbag")); System.out.println((s.length()-5)+""+s.charAt(0) + "\'s in " + s);
Describe what this statement does: print “user name = ” + userName
Provide an appropriate variable name for a variable that holds the total number of students.
Write a line of pseudocode that tells the computer to assign distance divided by time into a speed variable.
Write a line of pseudocode that tells the computer to put a user entry into a variable called height.
What are the three types of control flow described in this chapter?
Looping is appropriate whenever the next thing done is something previously done. (T / F)
Consider the following pseudocode:If it is night, set speedLimit to 55;Otherwise, set speedLimit to 65. Suppose the value of the variable, night, is “false.” After this code Page 60 runs, what
The above pseudocode does not have the exact form suggested in the text. Is that OK?
Draw a flowchart that implements this logic:If the temperature is greater than 10° C and it’s not raining, print “walk.” Otherwise, print “drive.”
Provide a solution to the previous problem in the form of pseudocode.
Where is a while loop’s terminating decision made?
When a while loop terminates, what executes next?
Is it possible for a while loop to have an infinite number of iterations?
Is it possible for a while loop to have zero iterations?
What are the three loop termination techniques described in this chapter?
A sentinel value is used to do which of the following?a) Specify the first value printed.b) Print an error message.c) Signal the end of input.
How does the form of pseudocode we use in most of this chapter differentiate an inner loop from an outer loop?
Which of the following is true?a) Tracing shows sequence of execution.b) Tracing helps you debug a program.c) Tracing highlights errors in loop initialization and termination.d) All of the above.
Trace the following Bowling Score algorithm (taken from Section 2.9). Use the setup shown below the algorithm. 1 totalScore 0 2 count +0 3 print "Enter score (-1 to quit): " 4 input score 5 while
Identify two important computer input devices.
Identify two important computer output devices.
Which type of storage device is normally preferred for tablet computers— hard drive or SSD? Why?

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