Java Command line and IDE

 

Java Command Line

📌 What is it?

The command line (or terminal) is a text-based interface where users can type commands to compile and run Java programs using tools provided by the Java Development Kit (JDK).

⚙️ Common Java Commands:

CommandDescription
javacCompiles Java source code to bytecode .class files
javaRuns the compiled Java program using the JVM
javapDisassembles .class files (shows bytecode info)
java -versionShows the installed Java version

✅ Example (on terminal or command prompt):


javac HelloWorld.java   # Compiles the file
java HelloWorld         # Runs the program

🔍 Pros:

  • Lightweight, fast

  • Helps understand the compilation and execution process

  • Good for beginners and scripting

🚫 Cons:

  • No auto-completion, debugging, or GUI support

  • Can be slow for large projects

IDE (Integrated Development Environment)

📌 What is an IDE?

An IDE is a software application that provides tools to help programmers write, test, and debug their code efficiently. It offers a graphical interface and advanced features.

💡 Popular Java IDEs:

IDEFeatures
EclipseOpen-source, good for enterprise development
IntelliJ IDEASmart coding assistant, widely used in industry
NetBeansOfficial Oracle IDE for Java, supports GUI design
BlueJBeginner-friendly, ideal for educational use

✅ Key Features:

  • Syntax highlighting

  • Code completion (auto-suggest)

  • Real-time error checking

  • Graphical debugging tools

  • Project management and build tools

🔍 Pros:

  • Boosts productivity

  • Easier debugging

  • Integrated GUI builders for apps

🚫 Cons:

  • Heavier than command-line tools

  • May hide internal compilation steps from learners

🎯 Summary

FeatureCommand LineIDE
InterfaceText-based        Graphical (GUI)
Best For                Learning basics, scripting        Large projects, GUI apps, debugging
Examplesjavac, java        Eclipse, IntelliJ, NetBeans
FeaturesMinimal        Full-featured development tools

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