EJavaCourse

This repository contains my homework from Java Winter Courses.

Lesson 1

Task 1 - console application that defines a positive integer number in the decimal number system, and then converts the number into binary/ternary/octal/hexadecimal number systems and prints the result.

Task 2 - console application that finds all perfect numbers in the range of 1 to some given positive number and prints them (the perfect number is number that is equal to the sum of its positive divisors, excluding the number itself. For instance, 6 = 1 + 2 + 3).

Task 3 - console application that calls method for building the piramide with a height ranging from 1 to 9.

Task 4 - console application which rotates a square matrix of dimension N 90 ° counterclockwise. The values of matrix elements are set using a random numbers generator. The matrix should contain both positive and negative values. To check the result, you need to display a given matrix and after processing.

Lesson 2

Task 1 - console application that:

• Identify the Drawable interface with the draw () figure construction method;
• Describes an abstract Shape class that implements an interface Drawable and containing a shapeColor field of type String for the color of the shape and a constructor for initializing it, an abstract method for calculating the area of the shape calcArea () and an overridden method toString ();
• describes the Rectangle, Triangle, Circle classes that inherit from the Shape class and implement the calcArea () method, and also override the toString () method;
• creates a dataset of type Shape (an array with a dimension of at least 10 elements);
• processes the array:
  • displays a data set;
  • calculates the total area of all figures in the data set;
  • calculates the total area of figures of a given type;
  • organizes the data set to increase the area of the figures, using the Comparator interface object
  • Sorts the data set by the color of the shapes using the Comparator interface object.
• When building the application, use the architectural MVC pattern.

Task 2 - console application that:

• describes the data type according to the table;
• creates a data set of the described type (an array with a dimension of at least 10 elements);
• uses menu work to process the created data array according to the table;
• uses the Comparator interface to organize the elements of the data array according to the table.
• If as a result of processing the data array not found, then a message must be displayed.
• To check the result of work, you need to output the original array after creation.
• When building the application, use the architectural MVC pattern.

Class	Data processing
Book:	1. Get a list of books by a specified author;
Title, Author, Publisher, Year of publication, Number of pages, Price	2. Get a list of books that are published by a specified publisher;
	3. Get a list of books published later than the specified year.
	4. Sort books by publishers

Lesson 3

Task 1 - an application that:

• describes the hierarchy of classes according to the table;
• describes a generalized class according to the table;
• demonstrates the use of objects of a generalized class;
• data for filling classes and their processing are set by keyboard input

Class hierarchy	Generalized class
Kids toys	Playroom, for which to implement:
	1. Sorting toys by some parameter;
	2. calculate the total value of all toys;
	3. Identify toys that match the specified range of parameters.

Task 2 - an application that:

• describes a class with some inner class according to the table;
• demonstrates the interaction between objects of these classes. For example, the creation of a department, the liquidation of a department, the reallocation of departments (sorting as an option), the supply of goods and so on.;
• data for filling classes and their processing are set by keyboard input

Outer class	Inner class
Store:	Department:
contains title and information about departments	contains a description of the department (name, type of goods, services, location)

Task 3 - an application that:

• creates a class with functionality similar to the java.lang.Enum class;
• creates an enumeration class based on the above described class;
• demonstrates the use of the described enumeration.

Lesson 4

Task 1 - Maven project that:

• has Junit dependency in the pom.xml file;
• has the class used to convert the temperature value to different units of measurement (Celsius, Kelvin, Fahrenheit);
• has a class with junit tests to test all the methods of the described class, which you can run to check;
• has parametrized tests.

Task 2 - task 2.2 rebuild to Maven project and added unit tests.