Java Әзірлеушісі

We will discuss how Java has been one of the most popular programming languages for many years, how easy it is to write in it, what the advantages and disadvantages of the language are, and how to become a Java developer. We will get acquainted with the features that Java has in comparison with other programming languages.

Consider the principles and approaches of object-oriented programming with examples: abstraction, one of the principles for defining important information when solving a problem; encapsulation, as a property of a programming language that allows to hide program complexity and the internal implementation of a solution from the user; inheritance, as one of the four factors of OOP, which allows existing classes to describe new classes; polymorphism, an approach to perform automatic selection of desired behavior depending on the context.

In this topic we will talk about primitive and referential data types, learn how to store information in variables and use them for output to the console. In practice, we will solve cases where the selected data type is not long enough to be used in a program, and learn about extending and narrowing data type conversions.

We will become familiar with the various operations in Java. Most of them can be classified into one of the following four groups: arithmetic, assignment, relation, and logical. We will take a closer look at each type.

A computer program can evaluate multiple conditions using selection operators and then execute appropriate instructions depending on which of the evaluated circumstances is true. In turn, a loop in programming is used to repeatedly repeat a particular piece of code. There are three loop operators in Java: while, do-while, and for. Java supports transition operators (break, continue) that pass control to another part of your program. In this session, we will look at each operator in detail.

We will look at data structures such as arrays, which provide a convenient way to group related information together. We will learn how to work with sets of similar data, and how to create, declare, and populate arrays with data.

In this lesson, we will explore how to save time writing a program, and how methods help us reuse code without retyping it. We will learn how to create methods and call them in code, use the principle of polymorphism by overloading methods, and use recursion to solve problems.

We know that Java is an object-oriented language, so concepts like "class" and "object" play a key role in it. Any program in Java can be thought of as a set of interacting objects. In this session, we will take a closer look at the fundamental concepts of Java, the principles of OOP and learn about classes and objects, and learn how to set properties and behavior using attributes and methods.

In this lesson, we will learn how to hide implementation details from the user, and how to protect our variables from external influence using getters and setters. We will break down examples of inheriting attributes and methods from one class to another, and create subclasses based on parent classes. With inheritance, you can extend the functionality of existing classes by adding new functionality or changing old functionality. We will learn how to use polymorphism in conjunction with inheritance. We will talk about overriding methods as an opportunity to implement a method so that it has an identical signature to the method of the ancestor class, but provides a different behavior without causing collisions when using it. Then we are gonna look at what interfaces are in Java, and how they are used to implement the principle of abstraction. Interfaces and internal classes provide more sophisticated ways to organize and control objects in your system.

In addition to the individual primitive data types and classes in Java, there is such a type as enum or enumeration. In this session, we will learn about a data type like enums. We will also talk about different data structures for storing information, such as ArrayList, LinkedList, HashMap, and HashSet.

A variety of errors can occur when executing Java code: coding errors made by the programmer, errors due to incorrect user input, or other unforeseen situations. In this lesson, we will focus on how to handle exceptions and how the program should react if an error occurs. When an error occurs, a Java program usually stops and displays an error message, however, we will learn how to change the behavior of the program and perform certain instructions using try, catch, finally operators.