Java Fundamentals Supplements (iii)

1. Class loading

Bootstrap ClassLoader-Boot (also known as primitive) class loader, which is responsible for loading Java's core classes. Extension ClassLoader-the extension classloader, which is responsible for loading the class pack of the jar in the JRE's extended directory (Java_home/jre/lib/ext or specified by the Java.ext.dirs system properties). System ClassLoader-Systems (also known as applications) ClassLoader, which is responsible for loading-classpath or Java.class.path System Properties from command Java when the JVM is started

Or classpath* the Jar class package and classpath as specified by the System properties.

2. Sequence of constructs involving inheritance

1. Execute the static code block of the parent class

2, execute the subclass of static code block

3. Executing the construction code block of the parent class

4. Execute the constructor of the parent class

5. Construct code block for sub-class execution

6. Execute the Subclass constructor

Java Fundamentals Supplements (iii)