2.1 Apple JVM Basics
First, make sure you have a
Java Virtual Machine (JVM).
Open up the Terminal application, type java
-version, and you'll see the
following message (or something similar):
java version "1.3.1"
Java(TM) 2 Runtime Environment,
Standard Edition (build 1.3.1-root-020219-20:07)
Java HotSpot(TM) Client VM (build 1.3.1, mixed mode)
This message indicates that your JVM is set up and working, and that
may seem like all you need to know. However, there is much more to a
JVM than the ability to fire up a Java process. For starters, Apple
preinstalls the JVM in a specific location, automatically including a
number of additional classes. These classes number in the hundreds
and add Apple-specific functionality to the core Java distributions.
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In this section we'll look at
Apple's JDK 1.3.1
installation, which is included with all Mac OS X 10.1 systems and
beyond. The
JDK 1.4.1 release is available for
download via Apple's Software Update feature or
http://www.apple.com/macosx/downloads. It
will install only on Mac OS X Version 10.2.3 or later.
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The Swing settings are also unique to the Apple JVM: the default look
and feel corresponds to the Aqua user interface, which has quite an
effect on your graphical applications. Apple also added hardware
acceleration (for JDK 1.3) and implemented a shared memory model for
reducing the overhead of running multiple Java applications. Although
you've got the same basic JVM as on a Unix, Linux,
or Windows platform, you should pay attention to some additions and
differences.
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