Introduction to Java
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Write and run your first Java programs, choose data types, work with Strings and arrays, and use operators to calculate and compare values.
Java is strict about structure: a program needs a class, a main method and properly ended statements before it will run. The lessons have you write and run short programs, store numbers, characters, true-or-false values and text in suitable data types, keep several values in an array, and calculate and compare values with operators, the groundwork for programs that make decisions.
What You Will Achieve
- Write and run a basic Java program with a class declaration, a main method and correctly ended statements.
- Choose a suitable primitive or String type for numbers, characters, boolean values and text.
- Declare an array, read its values by index and change its elements.
- Predict what short Java code segments print, including calculations and checks such as greater than or equality.
Program Overview
Java Syntax and Your First Program
Writing and running a first program, reading how Java code is laid out, and storing values in variables.
- Printing output and using print as a calculator
- The main method as the entry point
- Classes and statement syntax
- Creating and assigning variables
Data Types, Strings, and Arrays
The primitive types for whole and decimal numbers, characters and booleans, plus String handling and arrays that hold several values.
- int, double, boolean and char
- Declaring a variable now and assigning it later
- String concatenation, length and upper or lower case
- Arrays built around a list of Nobel winners
Arithmetic and Comparison Operators
Calculating with numeric values and testing conditions, the basis for decisions in Java programs.
- Addition, subtraction, multiplication and division
- Increment and decrement by one
- Greater than, less than, equal and not equal
Certificate Awarded (Paid)
Job Outlook
These Java basics lead into further study of a language used in mobile apps, enterprise software and web development.
Good for: Newcomers to programming, or programmers who know another language, who want to see how Java code is laid out and how it handles data.
Keep in mind: Its three chapters stop at operators, so comparisons are taught as groundwork for decision-making rather than used inside larger programs.
Bottom line: A tight, exercise-driven start on Java syntax, data types and operators, with arrays practiced on a list of Nobel winners.
Frequently Asked Questions
What is the difference between Java and JavaScript?
They are separate languages despite the similar names. Java is an object-oriented language for building full applications, while JavaScript mainly adds interactive elements to websites. This course teaches Java only.
What kind of exercises are in the course?
Each chapter mixes short lessons with coding tasks, such as filling in a class, printing results, assigning numbers to variables and building an array of Nobel winners, so you check your understanding by writing code.
Does the course teach object-oriented programming?
Only at the level of syntax. You fill in a class and meet the main method every Java program needs, but the chapters center on data types, Strings, arrays and operators rather than designing your own classes.
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