December 2018
Beginner to intermediate
458 pages
12h 18m
English
Content preview from Java in a Nutshell, 7th Edition
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 13. Platform Tools
This chapter discusses the tools that ship with the OpenJDK version of the Java platform. The tools covered are all command-line tools. If you are using a different version of Java, you may find similar but different tools as part of your distribution instead.
Later in the chapter, we devote a dedicated section to the jshell tool, which has introduced interactive development to the Java platform as of version 9.
Command-Line Tools
The command-line tools we cover are the most commonly used tools, and those of greatest utility—they are not a complete description of every tool that is available. In particular, tools concerned with CORBA and the server portion of RMI are not covered, as these modules have been removed from the platform with the release of Java 11.
Note
In some cases, we need to discuss switches that take filesystem paths. As elsewhere in the book, we use Unix conventions for such cases.
The tools we are discussing are:
-
javac -
java -
jar -
javadoc -
jdeps -
jps -
jstat -
jstatd -
jinfo -
jstack -
jmap -
javap -
jaotc -
jlink -
jmod
javac
Basic usage
javac some/package/MyClass.java
Description
javac is the Java source code compiler—it produces bytecode (in the form of .class files) from .java source files.
For modern Java projects, javac is not often used directly, as it is rather low-level and unwieldy, especially for larger codebases. Instead, modern integrated development environments (IDEs) either drive javac automatically ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.