1. Introduction If you’re learning Java, you’ll quickly run into the term “Java API”.For example, classes like String, ArrayList, and LocalDate are used in many Java programs—and they are all part of […]
1. What You Will Learn in This Article (Quick Conclusion) There are several ways to handle standard input in Java, but the key idea is simple: Choose the input method based on your purpose. You do not […]
1. What Are “Variables” in Java? When you start learning Java, one of the first important concepts you encounter is the “variable.”In short, a variable is a container used to temporarily store values […]
1. What Is Java’s double Type? Java’s double type is a fundamental data type for working with decimal values. Unlike int or long, which represent integers, double is used to represent numbers with a d […]
1. What Java “Hello World” Is (What You Confirm First) 1.1 Why Hello World Is the Perfect “First Step” “Hello World,” which often appears first when learning programming, is not just an example that p […]
1. What Are Constants in Java? In Java, a constant refers to “data that is expected not to change while the program is running.”The main purpose is to treat numbers, strings, and other values as fixed […]
1. Basic Knowledge for Converting Between Numbers and Strings in Java When developing in Java, you will inevitably encounter situations like “data that looks like a number but is handled as a string” […]
1. Introduction Purpose of This Chapter Java command-line arguments are a fundamental feature that allows programs to receive external values at runtime and change their behavior accordingly. This art […]
When you start learning Java, the first major hurdle you encounter is usually “compilation.” Simply writing source code (.java) is not enough to run a program. You must compile it using the javac comm […]
1. Introduction “What’s the difference between a do-while statement and while or for?” This is one of the first questions many beginners encounter when learning Java. The do-while loop is a post-test […]