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Data Handling & Collections (Java Standard Library)
  • 2025年12月29日

Java Null Checks Explained: Best Practices, Common Pitfalls, and Modern Solutions

1. Introduction When programming in Java, everyone encounters the value called null at some point. Null represents a state where nothing is being referenced, and it commonly appears with uninitialized […]

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Practical Java & API Usage
  • 2025年12月29日

Fix “java.lang.OutOfMemoryError: Java heap space” in Java: Causes, Heap Basics, and Practical Solutions

1. Introduction When you develop in Java, have you ever had your application suddenly crash and the console shows: This error means “Java has run out of usable memory (the heap).”However, from the err […]

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Java Fundamentals
  • 2025年12月29日

Java Command-Line Arguments Explained: From Basics to Practical Design Patterns

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 […]

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Java Fundamentals
  • 2025年12月29日

Java Compilation Explained: How javac Works, Compile Steps, and Common Errors

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 […]

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Java Fundamentals
  • 2025年12月29日

Java do-while Loop Explained: Syntax, Differences from while, Examples, and Common Pitfalls

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 […]

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Data Handling & Collections (Java Standard Library)
  • 2025年12月29日

Java LocalDateTime Explained: Basics, Formatting, Parsing, and Practical Usage

1. Target Audience and What You Will Learn Have you ever struggled with how to use the LocalDateTime class when working with dates and times in Java? This article is designed for everyone from Java be […]

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Data Handling & Collections (Java Standard Library)
  • 2025年12月29日

Java Date and Time API Explained: From Legacy Date to Modern java.time Best Practices

1. Introduction In Java-based system development and enterprise applications, accurate handling of dates and times is essential. Attendance management, scheduling, log records, file timestamp manageme […]

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Data Handling & Collections (Java Standard Library)
  • 2025年12月29日

Java String Concatenation Explained: Best Methods, Performance, and Best Practices

1. Introduction Want to concatenate strings in Java? This is a topic that everyone encounters at least once, from programming beginners to professional developers. Common scenarios include combining m […]

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Java Fundamentals
  • 2025年12月29日

How to Handle Line Breaks in Java: Newlines, OS Differences, and Text Blocks Explained

1. Introduction Among programming languages, Java is widely used in everything from enterprise systems to Android applications. Correctly handling line breaks is not only important for improving the r […]

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Data Handling & Collections (Java Standard Library)
  • 2025年12月29日

Java Set Explained: A Complete Guide to Unique Collections, HashSet, LinkedHashSet, and TreeSet

1. What Is a Set? In Java programming, a Set is one of the most important collection types. The word “Set” comes from mathematics, and just like a mathematical set, it has the key characteristic that […]

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