When we execute a Java program, the JVM (Java Virtual Machine) will look for the main() method to start a Java process for our program and then the JVM calls the underlying system in which is running to allocate memory and CPU time, an so on, until the program terminates.
Java's API offers a variety of prewritten tools, such as classes, interfaces, and packages, providing essential functionality for developers.
It includes Core, SE, EE, and ME APIs, as well as the Collection, Stream, I/O, Concurrency, JDBC, and JPA APIs.
Java has some benefits we need to know when we decide to learn and use it.