We’ll stick with Java SE for this introduction so that we can focus on the core JDK classes and technologies. To download the Java SE development kit, visit Oracle’s official download page.

Sealed classes in Java let developers limit the creation and use of subclasses and preserve the class hierarchy. Here is how sealed classes in Java work.

The JRE specifically contains a Java class loader, which is responsible for loading classes and connecting them to the core Java class libraries, and the JVM, that ensures proper environment ...