Category: Java

Java is a powerful, adaptable, and popular programming language. James Gosling and his colleagues at Sun Microsystems (a company that eventually joined Oracle Corporation) created it. Since its initial release in 1995, Java has grown to be one of the most well-liked and durable programming languages.

We will use IntelliJ IDEA for coding within this course.
1) Go to this website and download/install the IntelliJ IDEA (Community version) software onto your computer https://www.jetbrains.com/idea/download (follow the installation instructions on the left hand side menu).
2) After you have installed the IntelliJ IDEA, create a new project (JAVA) by following this YouTube – the project’s name is ‘HelloWorld’
a) See this video for example to get started with creating the ‘HelloWorld’ project
**you will change program’s System.out.println so that it will print Hello, World! My name is – your firstname, lastname
3) Locate the HelloWorld folder on your computer and zip the entire folder.
4) Submit the zipped file from step 3 to complete this assignment

Week 2’s assignment builds upon assignment #1
(so you will need to complete the installation of IntelliJ IDEA to move forward to week 2 and subsequent weeks).
In this week 2’s assignment, you will add to the helloworld project’s main method
1) declare a string variable called name
2) use System.out.print to request the user’s name
3) use the scanner class to accept user input and assign it to the variable called name
4) use System.out.print to print ‘Hello, your name is – x’. (where x is the variable name that stores the user input) Zip the helloworld folder (same as in assignment #1) and submit

Java is a high-level, versatile, and widely-used programming language that was first developed by Sun Microsystems in the mid-1990s. It was designed with the principle of “Write Once, Run Anywhere” (WORA), meaning that code written in Java can run on any platform that has a Java Virtual Machine (JVM) implementation, regardless of the underlying hardware and operating system.
Here’s a comprehensive explanation of Java:
Object-Oriented Programming (OOP): Java is a purely object-oriented programming language, which means that everything in Java is an object, including primitive data types like integers and characters. This promotes the concept of encapsulation, inheritance, and polymorphism, making code more modular and maintainable.
Platform Independence: Java source code is compiled into an intermediate form known as bytecode. This bytecode is not tied to a specific platform or machine, allowing it to be executed on any device with a compatible JVM. This enables Java’s “Write Once, Run Anywhere” philosophy.
Java Virtual Machine (JVM): The JVM is an integral component of the Java platform. It interprets the bytecode and translates it into native machine code for the host system, allowing Java applications to be executed. Different JVM implementations exist for various operating systems and architectures.
Syntax and Structure: Java’s syntax is largely influenced by the C++ programming language. It uses curly braces ({}) to define blocks of code, and statements are terminated with semicolons (;). Java has a strong and static type system, which means that variable types must be explicitly declared and their types are checked at compile-time.
Memory Management: Java manages memory allocation and deallocation automatically through a process known as garbage collection. This helps developers avoid common memory-related errors like memory leaks.
Standard Library: Java comes with a vast standard library (Java API) that provides classes and methods for various common tasks, such as input/output operations, data manipulation, networking, GUI development (with JavaFX or Swing), and more.
Multithreading: Java supports multithreading, allowing developers to create concurrent applications that can execute multiple tasks simultaneously. This is particularly useful for improving performance in applications that need to handle multiple processes concurrently.
Security: Java has built-in security features that help protect against malicious code and unauthorized access. The JVM enforces security checks to prevent unauthorized access to system resources.
Community and Ecosystem: Java has a large and active developer community, which has led to the creation of numerous libraries, frameworks, and tools that extend its capabilities. Popular frameworks include Spring (for enterprise applications) and Hibernate (for database interactions).
Portability: The portability of Java has made it a preferred choice for developing applications ranging from desktop software to web applications, mobile apps (Android is based on Java), server-side applications, and even embedded systems.
Versioning: Java has gone through several versions, with each introducing new features, improvements, and enhancements. Major versions are denoted by numbers (e.g., Java 8, Java 11, Java 16), while updates within versions are denoted by a version number and update number (e.g., Java 11.0.2).
In summary, Java is a powerful and versatile programming language known for its platform independence, strong community support, rich ecosystem, and widespread use in various domains of software development. Its combination of object-oriented principles, memory management, security features, and portability has contributed to its enduring popularity.

In this project, you will create a very simple drawing app. The focus is on ArrayLists, exception
handling, and the use of mouse listeners. Your solution will also make use of Encapsulation, Association,
Inheritance, and Polymorphism.
The app you create must be capable of drawing two kinds of shapes on a canvas. The two shapes should
inherit from a common superclass (you can use the Square, Circle, and GeometricObject classes given or
you can create your own). The user must be able to configure the parameters of the shape and must be
able to draw it by pressing a button or by clicking or dragging the mouse on the canvas.
Below is a UML class diagram for the code you are given for this assignment. You can adapt it as you
wish to suit your needs. At the very least, you will need to add lines to throw exceptions if the user tries
to create a shape with out of range or null parameters.
You don’t have to hand in a class diagram and you don’t have to implement what is shown below
exactly. In this example, PaintApp would store shapes in an ArrayList object.
The screen capture below shows a very bare-bones version of the app. Your app should not look exactly
like the one below. You should try to put some thought into what would make an attractive and usable
design.
The user must be able to configure the color, size and location of a shape and then draw it. The location
fields will only be used when the Draw button is pressed. Otherwise, it uses the mouse location.
If the user presses the Square or Circle button, drawing changes from squares to circles. When the user
presses the Undraw button, it removes the last shape drawn (it’s in the ArrayList) and then clears the
canvas and redraws everything to remove the shape. It should be possible to keep pressing Undraw and
removing shapes until the canvas is empty.
It should be impossible for the user to trigger an exception. When the user clicksDraw, clicks on the
canvas, or drags the mouse on the canvas, any possible exceptions (badly formatted fields, out of range
color values, etc.) should be caught and the user should get an error message in a label that specifies:
1. The name of the field that caused the error.
2. The nature of the error (out of range vs. non-numeric)
If more than one field causes an error, you only need to describe one of them in the label.
You will need to throw exceptions from constructors and setters in your shape classes for this work.
When the user successfully draws a shape, the error label should be reset to “No Errors” or something
similar. The color of the label should change to indicate errors vs. no errors.
Optional Extras
There is so much more that you could do with this! All the ideas below are optional.
• Add more shapes
• Set colors using a color chooser or some other method
• Set the location fields with a mouse click
• Clear all shapes
• Highlight error fields by changing their colors
• Add effects to the drawing (gradients, reflections, etc.)
• Allow the user to click and change objects
• Allow the user to ctrl-click and drag to draw and size at the same time
• Etc…
NOTE: Just follow all the instructions and please it should be written by you only and by any AI tool. In my last JAVA project which was done by you, the AI detector was showing me that you have copied some lines of code from “Github” and other sites. So, please make sure it is written by you only. And just follow all the instructions. Thank You!

Please refer to the instructions document for the details. To test the code, the treedata.txt file can be used.

Please refer to the instructions document for the details. To test the code, the treedata.txt file can be used.

The classes in the diagram represent products that are available at Tim’s Hardware Store. Some of them
are Rentable and some are not. Each one is a TimsProduct and a Commodity. You must add one
Rentable product and one that is not Rentable.
Also represented is TimsOrder. This class has an array that contains 1 or more TimsProducts,
representing a named customer’s order. The + on the association arrow means “1 or more”.
These methods are used for checking a rentable tool out, checking whether it is currently rented, and
returning it. In the RentableHardware abstract class, these methods all manipulate the boolean variable
rented.
Notice that many of the constructors are private. The classes with private constructors have static
create methods. Instead of calling a constructor, call the create method, like this:
BoxOfNails b = BoxOfNails.create();
This method will have a dialog with the user to collect information about the object (in this case then
name, cost, and price of the product as well as the size of the nails and the quantity of nails in the box),
and will then create and return an object by calling the private constructor. When you add your two new
products, you should follow this same design pattern.1
For rentable products, you should ask the user whether the customer will be renting or buying the
product. If they are renting, you should call the rent method.
The TimsOrder class also uses a create method. This method asks the user their name and how many
products they want, then creates a TimsOrder object by calling its private constructor. Then for each
item in the array, it asks what type the customer wants (BoxOfNails, NailGun or one of the other two
types you will add), then calls the appropriate create method and stores the result in the array.
Model vs. View
Note that because the create methods are talking to the user, this assignment does not maintain the
standard model/view separation. However, you can think of the static methods as implementing the
view, and the instance methods and variables as implementing the model.
The getAmountDue method adds up all the retail prices of the products in the order (or rental prices if
rented is true for a product) and returns the sum. The toString method returns a String with the name
of the customer and the toString values of all the products in the order, something like this:
Order for: Sam Scott
TimsProduct{name=”Finishing Nails”, cost=2.34, price=5.99}
Type… BoxOfNails{size=1.5, quantity=50}
TimsProduct{name=”Pneumatic Nail Gun”, cost=98.32, price=199.99}
Type… RentableHardware{rentalCost=19.99, rented=true}
Type… NailGun{features=”8 nails per second”}
Notice that the BoxOfNails and NailGun toString methods are incorporating the TimsProduct and
RentableHardware toString methods. You should do this as well, but feel free to make your output look
nicer than this!
Use the code below to test your classes. This short program should initiate an elaborate dialog with the
customer through calls to the create methods, then output the order and the total, rounded to two
decimal places. You should be able to use this code without changing it.
public class TestClass {
public static void main(String[] args) {
TimsOrder t = TimsOrder.create();
System.out.println(t);
System.out.printf(“Total Price: $%.2fn”, t.getAmountDue());
}
}
Advice:
1. Go top down. Start with the highest interfaces and classes and work downwards.
2. Make instance variables, and easy methods. For the more complicated methods, just write
“stubs” for now.
3. A method stub is an empty method. You make this first and fill in the details later. An example
of a method stub for TimsOrder.create is shown below.
4. Once you have the entire structure created like this, you can start filling in the details of each
method.
public static TimsOrder create() {
// TODO: Fill in this stub to have a dialog with the user
//and create a TimsOrder.
return null;
}
Hint:
In the TimsOrder.create method, create the TimsOrder object as soon as you know many products are
required, then you can access the private array of products directly. This is allowed because the create
method is inside the TimsOrder class.
NOTE: Please follow all the instructions as given above. Make sure it should be written by you and NOT by any AI tool. Moreover, I have attached a screen capture for the question as the answer should be made for the given UML diagram. Please find it attached. And I want a JAVA file.

Java is a widely used, high-level, object-oriented programming language developed by Sun Microsystems (now owned by Oracle Corporation) in the mid-1990s. It was designed to be platform-independent, allowing developers to write code once and run it on any device or operating system that supports Java, making it highly portable.
Key characteristics of Java include:
Platform Independence: Java programs are compiled into an intermediate bytecode that can be executed by the Java Virtual Machine (JVM). This enables Java applications to run on any system with a compatible JVM, regardless of the underlying hardware and operating system.
Object-Oriented: Java follows the object-oriented programming (OOP) paradigm, which promotes the use of objects, classes, and inheritance to create modular, reusable, and extensible code.
Write Once, Run Anywhere (WORA): Due to the platform independence provided by the JVM, Java is often referred to as a “write once, run anywhere” language. This allows developers to create applications that can be deployed across different platforms with minimal modifications.
Rich Standard Library: Java comes with a vast standard library that provides a wide range of pre-built classes and methods for common tasks like input/output, networking, collections, and more, simplifying development and saving time.
Memory Management: Java handles memory management automatically through its garbage collection mechanism, which identifies and clears unused objects, freeing up memory and reducing the risk of memory leaks.

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