For example, while this book’s third edition was being written, Java 8 was not yet released, but JDK 8 builds could be obtained from the OpenJDK project. You can sometimes find prerelease builds of the next major Java version on. Standard downloads for the current release of Java are available at Oracle’s website. Which you’ll want if you’re going to be developing Java software. The JDK or Java SDK download is the full development environment, The JRE (Java Runtime Environment) is a smaller downloadįor end users. Be aware that thereĪre several different downloads. If you don’t already have Java installed, you’ll need to download it. The chapter ends with some general information about conditional compilation, unit testing, assertions, and debugging. Deprecation warnings follow after that, because you’re likely to encounter them in maintaining “old” Java code. Another issue people run into is setting CLASSPATH correctly, so that’s dealt with next. Before you can try out anything in this book, you need to be able to compile and run your Java code, so I start there, showing several ways: the JDK way, the Integrated Development Environment (IDE) way, and the build tools (Ant, Maven, etc.) way. This chapter covers some entry-level tasks that you need to know how to do before you can go on-it is said you must crawl before you can walk, and walk before you can ride a bicycle.
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