Wiley Professional Java JDK 6 Edition 978-0-471-77710-6 ユーザーズマニュアル
製品コード
978-0-471-77710-6
Key Java Language
Features and Libraries
The past two major releases of the JDK have seen some significant changes. JDK 5 introduced new
features at the language level, something that has not happened since Java was first released.
Some of the most significant features added to the language are generics (parameterized types),
enumerations, and metadata. With JDK 6, one of the biggest changes is the inclusion of a
lightweight database known as Derby, which is from the Apache Database project.
features at the language level, something that has not happened since Java was first released.
Some of the most significant features added to the language are generics (parameterized types),
enumerations, and metadata. With JDK 6, one of the biggest changes is the inclusion of a
lightweight database known as Derby, which is from the Apache Database project.
The first half of this chapter introduces Derby and reviews the new language features from JDK 5.
The second half of this chapter details certain key utility packages in the
The second half of this chapter details certain key utility packages in the
java.util
branch of the
class library that are useful for professional programming in Java.
Introducing Derby
New to Java 6 is a lightweight database called Derby, a product of the Apache Database project.
Derby is a transactional, relational database and provides a small footprint on disk. As of the July
13, 2006 release of the Java 6 JDK, Derby is installed (by default) in
Derby is a transactional, relational database and provides a small footprint on disk. As of the July
13, 2006 release of the Java 6 JDK, Derby is installed (by default) in
C:\Program Files\Java\
jdk1.6.0\db
and includes the core libraries, demonstration programs, and an example database.
Derby started its life as CloudScape, a product IBM acquired with Informix. In 2004, IBM decided
to open source CloudScape and it became an incubator project under the Apache Software
Foundation with the name Derby. The real benefits to using Derby are that it has minimal adminis-
tration needs and a small footprint. The databases are small on disk, roughly 2MB for a basic
database. The fact that administration is minimal allows you, as a developer, to easily create and
use databases in code. This speeds up development. Deployment is made that much easier
because Derby supports storage of a database archived in a JAR file, allowing you to simply dis-
tribute the JAR file.
to open source CloudScape and it became an incubator project under the Apache Software
Foundation with the name Derby. The real benefits to using Derby are that it has minimal adminis-
tration needs and a small footprint. The databases are small on disk, roughly 2MB for a basic
database. The fact that administration is minimal allows you, as a developer, to easily create and
use databases in code. This speeds up development. Deployment is made that much easier
because Derby supports storage of a database archived in a JAR file, allowing you to simply dis-
tribute the JAR file.
Because Derby is an involved topic, this section serves only to introduce Derby and its features,
using the included command-line tool and a brief exploration of using the JDBC driver. Derby is
revisited later in this book.
using the included command-line tool and a brief exploration of using the JDBC driver. Derby is
revisited later in this book.
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