Chapter 3: Problem 3
What is the difference between a local variable and an instance variable?
Short Answer
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Chapter 3: Problem 3
What is the difference between a local variable and an instance variable?
These are the key concepts you need to understand to accurately answer the question.
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Get started for freeCreate a class called Date that includes three instance variables - a month (type int), a day (type int) and a year (type int). Provide a constructor that initializes the three instance variables and assumes that the values provided are correct. Provide a set and a get method for each instance variable. Provide a method displayDate that displays the month, day and year separated by forward slashes \((/) .\) Write a test app named DateTest that demonstrates class Date's capabilities.
Most classes need to be imported before they can be used in an app. Why is every app allowed to use classes System and String without first importing them?
Explain the purpose of an instance variable.
Fill in the blanks in cach of the following: a) Each class declaration that begins with keyword ______ must be stored in a file that has exactly the same name as the class and ends with the .java filename extension. b) Keyword ______ in a class declaration is followed immediately by the class's name. c) Keyword ______ requests memory from the system to store an object, then calls the corresponding class's constructor to initialize the object. d) Each parameter must specify both a(n) ______ and \(a(n)\) ______ e) By default, classes that are compiled in the same directory are considered to be in the same package, known as the ______ f) Java provides two primitive types for storing floating-point numbers in memory: ______ and ______ g) Variables of type double represent ______ floating-point numbers. h) Scanner method ______ returns a double value. i) Keyword public is an access ______ j) Return type ______ indicates that a method will not return a value. k) Scanner method ______ reads characters until it encounters a newline character, then returns those characters as a String. I) Class String is in package______ \(\mathrm{m}) \mathrm{A}(\mathrm{n})\) is not required if you always refer to a class with its fully qualified class name. n) \(A(n)\) ______ is a number with a decimal point, such as 7.33,0.0975 or 1000.12345 o) Variables of type float represent ______ -precision floating-point numbers. p) The format specifier ______ is used to output values of type \(f\) loat or double. q) Types in Java are divided into two categories ______ types and ______
Create a class called Employee that includes three instance variables- \(a\) first name (type String), a last name (type String) and a monthly salary (double). Provide a constructor that initializes the three instance variables. Provide a set and a get method for each instance variable. If the monthly salary is not positive, do not set its value. Write a test app named EmployeeTest that demonstrates class Employee's capabilities. Create two Employee objects and display each object's yearly salary. Then give each Employee a \(10 \%\) raise and display each Employee's yearly salary again.
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