Introduction to Java Programming and Data Structures: Brief Version (11th Global Edition)
11th Edition
ISBN: 9780134671710
Author: Y. Daniel Liang
Publisher: PEARSON
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Textbook Question
Chapter 9, Problem 9.6PE
(Stopwatch) Design a class named StopWatch. The class contains:
- Private data fields startTime and endTime with getter methods.
- A no-arg constructor that initializes startTime with the current time.
- A method named start () that resets the startTime to the current time.
- A method named stop () that sets the endTime to the current time.
- A method named getElapsedTime () that returns the elapsed time for the stopwatch in milliseconds.
Draw the UML diagram for the class then implement the class. Write a test
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Problem 1
Write a function named initialLetterCount that takes one parameter,
wordList - a list of words. Create and return a dictionary in which each
initial letter of a word in wordList is a key and the corresponding value is
the number of words in wordList that begin with that letter. The keys in the
dictionary should be case-sensitive, which means 'a' and 'A' are two
different keys.
For example, the following is correct output:
horton = ['I', 'say', 'what', 'I', 'mean', 'and', 'I', 'mean', 'what', 'I', 'say']
print(initialLetterCount(horton))
{'I': 4, 's': 2, 'w': 2, 'm': 2, 'a': 1}
Problem 2
Write a function named initialLetters that takes one parameter, wordList – a
list of words. Create and return a dictionary in which each initial letter of a
word in wordList is a key and the corresponding value is a list of the words
in wordList that begin with that letter. There should be no duplicate words
in any value in the dictionary.
For example, the following is correct output:…
Answer this in hand written note
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Chapter 9 Solutions
Introduction to Java Programming and Data Structures: Brief Version (11th Global Edition)
Ch. 9.3 - Prob. 9.3.1CPCh. 9.3 - How do you define a class?Ch. 9.3 - How do you declare an objects reference variable?Ch. 9.3 - How do you create an object?Ch. 9.4 - Prob. 9.4.5CPCh. 9.4 - When will a class have a default constructor?Ch. 9.5 - Which operator is used to access a data field or...Ch. 9.5 - What is an anonymous object?Ch. 9.5 - Prob. 9.5.3CPCh. 9.5 - Is an array an object or a primitive-type value?...
Ch. 9.5 - Prob. 9.5.5CPCh. 9.5 - What is wrong in the following code? 1. class Test...Ch. 9.5 - Prob. 9.5.7CPCh. 9.6 - Prob. 9.6.1CPCh. 9.6 - Prob. 9.6.2CPCh. 9.6 - Which packages contain the classes Date, Random,...Ch. 9.7 - Suppose the class F is defined in (a). Let f be an...Ch. 9.7 - Prob. 9.7.2CPCh. 9.7 - Can you invoke an instance method or reference an...Ch. 9.9 - Prob. 9.9.1CPCh. 9.9 - Prob. 9.9.2CPCh. 9.9 - In the following code, radius is private in the...Ch. 9.10 - Prob. 9.10.1CPCh. 9.10 - Show the output of the following program: public...Ch. 9.10 - Show the output of the following code:Ch. 9.10 - Prob. 9.10.4CPCh. 9.11 - What is wrong in the following code? 1public class...Ch. 9.12 - If a class contains only private data fields and...Ch. 9.12 - If all the data fields in a class are private and...Ch. 9.12 - Is the following class immutable? public class A {...Ch. 9.13 - What is the output of the following program?...Ch. 9.14 - Prob. 9.14.2CPCh. 9.14 - Prob. 9.14.3CPCh. 9 - (The Rectangle class) Following the example of the...Ch. 9 - (The Stock class) Following the example of the...Ch. 9 - (Use the Date class) Write a program that creates...Ch. 9 - Prob. 9.4PECh. 9 - (Use the GregorianCa1endar class) Java API has the...Ch. 9 - (Stopwatch) Design a class named StopWatch. The...Ch. 9 - (The Account class) Design a class named Account...Ch. 9 - (The Fan class) Design a class named Fan to...Ch. 9 - (Geometry: n-sided regular polygon) In an n-sided...Ch. 9 - Prob. 9.10PECh. 9 - (Algebra: 2 2linear equations) Design a class...Ch. 9 - (Geometry: intersecting point) Suppose two line...Ch. 9 - (The Location class) Design a class named Location...
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