Output: null The output is null because the bootstrap class loader has no parent class loader. In Java 9 and later versions, the extension class loader was removed from the JVM. It was used in ...

The first half of this introduction to Java inheritance teaches you how to use the extends keyword to derive a child class from a parent class, invoke parent class constructors and methods ...

If another developer attempts to extend your parent class and introduce a new object type, a once exhaustive evaluation becomes incomplete and ineffective. Java does enable the option to mark a class ...

The release of Java SE 15 in Sept 2020 will introduce "sealed classes" (JEP 360) as a preview feature. A sealed class is a class or interface which restricts which other classes or interfaces may ...

Instance main methods and unnamed classes, coming in Java 21, will forever change how developers learn Java and bootstrap applications. Why? They provide a simple, clean and concise syntax to launch ...