BiteSizedChunks.comLearn one small thing at a time.

Course contentsShow

1What is the JDK and Why Do You Need It?
2JDK vs JRE vs JVM: The Three-Layer Architecture
3Choosing a JDK Distribution: Oracle, OpenJDK, and Others
4Installing the JDK on Your Operating System
5Setting the JAVA_HOME Environment Variable
6Adding Java to Your System PATH
7Verifying Your Installation with java -version
8Overview of JDK Tools: javac, java, jar, and javadoc
9Anatomy of a Java Source File
10The main Method: Entry Point of Execution
11Writing Your First Hello World Program
12Compiling with javac
13Running with java
14Understanding Compilation Errors
15Understanding Runtime Errors
16The System.out.println Method
17Comments in Java: Single-Line and Multi-Line
18Source File and Class Name Matching
19What is Bytecode? The Bridge Between Source and Machine Code
20The Java Virtual Machine (JVM): An Abstract Computer
21Write Once, Run Anywhere: How Bytecode Enables Portability
22javac vs java: The Compiler and Runtime Tools
23Inside a .class File: Structure and Contents
24The JVM Execution Process: Loading, Verifying, and Running
25JIT Compilation: From Bytecode to Native Code at Runtime

1What is the JDK and Why Do You Need It?
2JDK vs JRE vs JVM: The Three-Layer Architecture
3Choosing a JDK Distribution: Oracle, OpenJDK, and Others
4Installing the JDK on Your Operating System
5Setting the JAVA_HOME Environment Variable
6Adding Java to Your System PATH
7Verifying Your Installation with java -version
8Overview of JDK Tools: javac, java, jar, and javadoc
9Anatomy of a Java Source File
10The main Method: Entry Point of Execution
11Writing Your First Hello World Program
12Compiling with javac
13Running with java
14Understanding Compilation Errors
15Understanding Runtime Errors
16The System.out.println Method
17Comments in Java: Single-Line and Multi-Line
18Source File and Class Name Matching
19What is Bytecode? The Bridge Between Source and Machine Code
20The Java Virtual Machine (JVM): An Abstract Computer
21Write Once, Run Anywhere: How Bytecode Enables Portability
22javac vs java: The Compiler and Runtime Tools
23Inside a .class File: Structure and Contents
24The JVM Execution Process: Loading, Verifying, and Running
25JIT Compilation: From Bytecode to Native Code at Runtime

Lesson 2491 of 2,870·47. Java Platform Module System (JPMS)Pro lesson

opens vs exports: Key Differences

Compare opens (reflection-only access) with exports (compile-time and runtime access) to understand when to use each.

This lesson is for subscribers

You've completed the free preview. Subscribe to unlock every lesson in every course.

See pricing Back to course