Learn how to build reusable blocks of code using custom methods. Discover how to define your own methods, pass in parameters, and return results. Practice with real examples like calculators and string operations to sharpen your method-writing skills.

What are methods?

Domain checking

Security checking

Creating your own methods

Greetings

Squaring

Adding parameters

Greet the name

Multiply and prosper

Methods

Direct the flow of your code using conditional logic. Use if, else if, and else statements to handle different scenarios, and combine conditions with logical operators like && and ||. Build the kind of branching logic that real-world programs rely on.

If statements

Power 9000

Dice game

Else, else if

Grading

Grade some more

Logical operators

Email checking

Email checking, but better

Switch statements

Weather Reporter

Simulation

Control flow

Automate repetitive tasks with Java’s powerful loop structures. Write for and while loops, and explore how to iterate through Arrays and Strings. Understand when to use each type of loop and how to control their behavior.

For loops

Spelling bee

Characters

Foreach loops

Batch Checking

Batch Changing

While loops

Odd summing

Breaking Out

Loops

Bring everything together to create flexible, readable code workflows. Combine methods, loops, and conditionals to tackle practical coding challenges. Practice structuring your logic into reusable components that are easy to understand and maintain.

Building your own methods

Oddity

Reversing!

Looping and methods

New price

Maximum

Building a workflow

Collatz

Finding local files

Wrap-up

Bringing it all together

Strengthen your Java fundamentals by learning how to write reusable methods, control the flow of your programs, and automate repetitive tasks with loops. Through hands-on exercises, you’ll combine these core skills to build structured, flexible, and maintainable code. By the end of the course, you’ll be confident writing custom logic using real-world programming patterns that form the backbone of Java development.

<h2>Write Reusable, Structured Java Code</h2>
Take your Java skills to the next level by mastering methods, control flow, and loops—three essential building blocks of real-world programming. In this course, you'll learn how to define your own methods to keep your code organized and avoid repetition. You’ll also explore how to pass information into methods using parameters and return values to make your code more flexible and powerful.<br><br>

<h2>Build Smarter Logic with Control Flow and Loops</h2>
Once you’re comfortable writing methods, you’ll learn how to guide your program’s behavior using conditional logic. Practice writing <code>if</code>, <code>else if</code>, and <code>else</code> statements, and combine them with logical operators to handle multiple conditions. Then, discover how to use different types of loops—including <code>for</code> and <code>while</code>—to repeat tasks efficiently and iterate over Strings and arrays.<br><br>

<h2>Practice Real-World Coding Patterns</h2>
Throughout the course, you’ll apply what you learn in hands-on exercises that bring everything together. You’ll build your own methods, use them inside loops, and apply conditionals to create flexible workflows. By the end, you’ll not only understand how to write cleaner, more maintainable code—you’ll have a toolkit of foundational patterns used by professional Java developers every day.

Introduction to Java

Learn to write cleaner, smarter Java code with methods, control flow, and loops.

Intermediate Java

Kỹ sư dữ liệu trong Java

Java Developer

Cơ bản về Java

Breaking Out

Intermediate Java

Hướng dẫn bài tập

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