In java: ( We are using this Book: Starting out with java by Tony Gaddys) a)...
In java: ( We are using this Book: Starting out with java by Tony Gaddys)
a) What does a no-arg constructor for a string do?
b) How do you subclass a given class?
Homework Answers
1) null
Default constructor or no-arg constructor is called when there are no user defined constructors in the class. And it assigns default values to the class members and for string it will assign null.
2) extends keyword
Class A extends B
Java has inheritance concept where we can inherit one class to another class, and here the class being inherited (i.e. we are sub classing the class) is called base class or super class and the one which is inheriting it is called subclass. In above example B is superclass (which we are sub classing) and A is subclass which is inheriting class B using keyword extends.
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In java: ( We are using this Book: Starting out with java by
Tony Gaddys)
a)...
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Programming language: Java
Design an application that has three classes. The first one, named Book describes book object and has title and number of pages instance variables, constructor to initialize their values, getter methods to get their values, method to String to provide String representation of book object, and method is Long that returns true if book has over 300 pages, and returns false othewise. Provide also method char firstChard) that returns first cahracter of the book's title. The second...
I need the following written in Java please, thank you
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We want you to implement a java class that will show details on users and throw exceptions where needed. The following requirements specify what fields you are expected to implement in your User class: - A private String firstName that specifies the first name of the user - A private String lastName that specifies the last name of the user - A private int age that specifies user's age...
I need help for part B and C
1) Create a new project in NetBeans called Lab6Inheritance. Add a new Java class to the project called Person. 2) The UML class diagram for Person is as follows: Person - name: String - id: int + Person( String name, int id) + getName(): String + getido: int + display(): void 3) Add fields to Person class. 4) Add the constructor and the getters to person class. 5) Add the display() method,...
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