Читать книгу OCP Oracle Certified Professional Java SE 17 Developer Study Guide - Jeanne Boyarsky - Страница 60

In Java 8 and earlier, you could download a Java Runtime Environment (JRE) instead of the full JDK. The JRE was a subset of the JDK that was used for running a program but could not compile one. Now, people can use the full JDK when running a Java program. Alternatively, developers can supply an executable that contains the required pieces that would have been in the JRE.

When writing a program, there are common pieces of functionality and algorithms that developers need. Luckily, we do not have to write each of these ourselves. Java comes with a large suite of application programming interfaces (APIs) that you can use. For example, there is a StringBuilder class to create a large String and a method in Collections to sort a list. When writing a program, it is helpful to determine what pieces of your assignment can be accomplished by existing APIs.

You might have noticed that we said the JDK contains the minimum software you need. Many developers use an integrated development environment (IDE) to make writing and running code easier. While we do not recommend using one while studying for the exam, it is still good to know that they exist. Common Java IDEs include Eclipse, IntelliJ IDEA, and Visual Studio Code.