What is JDK?
JDK (Java Development Kit) is a software development environment used for developing Java applications. It includes tools and libraries needed to write, compile, and run Java programs.
🔍 What’s inside the JDK?
- JRE (Java Runtime Environment): Allows you to run Java applications.
-
Javac (Java Compiler): Converts
.javafiles into.classbytecode files. - Java (Launcher): Runs the compiled Java bytecode.
-
Development Tools: Debuggers, documentation generators (
javadoc), and other utilities.
🧩 Key Components:
| Tool | Purpose |
|---|---|
javac |
Compiles Java source code |
java |
Launches Java applications |
javadoc |
Generates documentation from code |
jdb |
Java debugger |
jar |
Packages files into a JAR (Java Archive) |
🧑💻 Use Case:
If you’re writing Java code – whether it’s a small console app or a complex enterprise application – you need the JDK.
📌 Without the JDK, you can run Java programs (via the JRE) but can’t develop or compile them.
