Over a million developers have joined DZone.
{{announcement.body}}
{{announcement.title}}

FEST-Reflect 0.3: Java Reflection Simplified

DZone's Guide to

FEST-Reflect 0.3: Java Reflection Simplified

· Java Zone ·
Free Resource

Verify, standardize, and correct the Big 4 + more– name, email, phone and global addresses – try our Data Quality APIs now at Melissa Developer Portal!

FEST-Reflect is a Java library that provides a Fluent Interface-based API that simplifies the usage of Java Reflection, resulting in improved readability and type safety. It supports access to constructors, methods and fields.

We are proud to announce that FEST-Reflect 0.3 is out!

Although I heard/read many times that reflection is "evil" (whatever that means,) I still think reflection can be useful in certain cases. For example, in FEST-Swing, there are a couple of special cases where we don't have enough platform-related information to simulate user input on a Swing component. Our last resource is to access the UI delegate of such component (e.g. JTree) using reflection to achieve our goal.

As any tool, reflection has its uses. The "evil" part, IMHO, comes from abuse.

The following example compares FEST-Reflect with plain reflection. Let's start by defining the class Names:

class Names {
private final List<String> names = new ArrayList<String>();

String get(int index) {
return names.get(index);
}
}

The following code listing shows how to call the method "get" using reflection:

Method method = Names.class.getMethod("get", int.class);

AccessController.doPrivileged(new PrivilegedAction<Void>() {
public Void run() {
method.setAccessible(true);
return null;
}
});

String name = (String) method.invoke(names, 8);

The same example using FEST-Reflect:

String name = method("get").withReturnType(String.class)
.withParameterTypes(int.class)
.in(names)
.invoke(8);

You can download the latest release here (file fest-reflect-0.3.zip.) FEST-Assert requires Java SE 5.0 or later.

Here are some useful links:

Feedback is always appreciated :)

Developers! Quickly and easily gain access to the tools and information you need! Explore, test and combine our data quality APIs at Melissa Developer Portal – home to tools that save time and boost revenue. 

Topics:

Published at DZone with permission of

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}