Software features
Syntax checking: Detect syntax errors (such as type mismatch, missing semicolon) at compile time.
Annotation processing: Supports enhancing code readability through @Override, @Deprecated and other annotations.
Generic erasure: The compilation phase processes generic types and generates original type bytecode (compatible with JVM).
Cross-platform execution: Achieve "write once, run anywhere" by interpreting bytecode or just-in-time compilation (JIT) into machine code.
Memory management: Automatically allocate/recycle heap memory and support garbage collection (GC) algorithms (such as G1, ZGC).
Security mechanism: bytecode verification, Security Manager (SecurityManager) to prevent malicious code.
Software function
Debugging tools:
jdb: command line debugger, supports breakpoints, single-step execution, and variable viewing.
jconsole/VisualVM: Graphically monitor JVM memory, threads, and class loading status.
Documentation tools:
javadoc: Generate API documentation in HTML format from code comments (supports @param and @return tags).
Packaging tools:
jar: Package .class files into JAR (Java Archive), support executable JAR (specify the main class through MANIFEST.MF).
moditect (Java 9+): Generates modular JAR, supports JPMS (Java Platform Module System).
Bytecode compatibility: The same bytecode can run on Windows, Linux, macOS and other systems (requires corresponding JVM).
Local Interface (JNI): Allows Java to call C/C++ code (such as OpenGL used in game development).
FAQ
Class not found exception
Possible reasons: the class path does not contain the required class files, the JAR package is not correctly added to the class path, the IDE configuration is incorrect, etc.
Solution: Ensure that all necessary class files and JAR packages are included in the classpath; check the project's build path settings in the IDE to ensure that all dependencies are configured correctly.
JDK update log:
1. The pace of optimization never stops!
2. More little surprises are waiting for you to discover~
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