Java Examples Made Easy

Ever struggled to find an example of how to use a class or API? You may read the javadoc, JDK Tutorial, check books, maybe even 'grep' your code base, but still can't find one. No more. JExamples makes it easy to find high-quality example uses of Java APIs. JExamples understands the semantics of Java and performs a search that is not only faster, but also more thorough than that performed by a text search tool, such as "grep".

JExamples Store:

Your query searches a large and growing database of Production, Open Source Java code. Each search result shows a 5 line code preview, one preview for each source file that contains code that invokes the Class.method you specified. The previews are sorted by user rating. The previews help you quickly review the search results, without having to view each source file. Click a result link to view the full source file.

Several types of queries are supported -- see Search Help for details. The most common query is to enter a Java Class-name and then press Search.

JExamples Compared to Competing Tools

There is an important difference between JExamples and most of the 'other guys' and that is that JExamples understands the Java language and uses that knowledge to perform your search. This is similar to the difference between refactoring technology and search and replace. Thus, our searches are much more than just an intelligent 'grep'. JExamples knowledge of Java allows us to support features like:

• Accurate results. The examples provided are accurate and will not include common issues with string matches in comments or for classes with the same name in different packages.
• You can Rate examples. We order your search results based on those community ratings, so the best ones come first.
• We recognize and tell you if you search for a class name that is ambiguous (class with same name lives in multiple packages).
• If you search for just a Class-name, we will show you a list of all methods on that class that we have examples for.
• We support 'Did you mean' query corrections, which help you catch spelling errors in a class or method name.

Source Files

If you click the link to view the source file, you will see the complete source file, as distributed by the open source project, without modification except for the color-coding of keywords to aid readability. There can be other examples of the API you queried for within that same source file -- a table at the top of the page shows them all and has links that will jump you to them.

Open Source Products

"Production-Quality Java Examples"

All open source products in our database are shown on our Database Content page. This list is still growing and we keep an eye on queries that return 0 rows to get ideas about what to add next. But if you find a hole in our API coverage and also happen to know an open source product you like that uses that API, then please let us know.

Contribute

If you know of an open source project which would be a good addition to our product set, please consider helping add this project by sending an e-mail with the following information:

• Name of the project
• URL for the project
• Link to the license information

In addition to the above information, a source and class archive will be requested later in a specific format.

Example Rating

Shows how users rate this particular example. In the source files, you are allowed to Rate individual examples (must have browser cookies enabled). The search results are ordered by this Rating, and the highest rated examples come first. The first number in the Rating tells what percentage of users said the example is useful and the second tells how many users have rated it. Thus, a rating of "60% of 100" would mean that 100 users have rated the example, with 60% of those users voting that it was helpful and 40% voting that it was not helpful.

Search Result Order

Search Results are ordered by the example Rating percentage and the highest rated examples come first. For example, since 80% is greater than 70%, an example with the rating "80% of 10" would come before one with rating "70% of 20". Also note that an example with a 50% rating will sort the same as an unrated example (one with rating "0% of 0").

Complexity

Represents the level of complexity of the method in which the example lives. We make a cyclomatic complexity measurement of every method when we analyze the code and map our complexity measurements to one of 3 values: low, medium, and high, represented by the numbers 1, 2 and 3. You can also specify a complexity clause in your queries if you want to see only examples in methods of a particular complexity.

C1 - Complexity 1 (low).
C2 - Complexity 2 (medium).
C3 - Complexity 3 (high).

News

Log of past java examples news.