Everything You Always Wanted to Know About Java 8

24. Oktober 2014 2 Kommentare

Would you like to explore Java structures online? Then you should have a look at our Neo4j demo instance at https://jqassistant.org/demo/java8!

It gives you access to a Neo4j browser where you can execute your own queries and explore the structures of the Java 8 Runtime Environment as scanned by the jQAssistant Java plugin. Just enter one of the following queries in the top level area and hit Ctrl-Enter:

How many types are contained in the Java Runtime Environment?
```
MATCH
  (t:Type:File)
RETURN
  count(t)
```

Which class extends from another class?

MATCH
  (c1:Class)-[:EXTENDS]->(c2:Type)
RETURN
  c1.fqn, c2.fqn
LIMIT 20

Which classes contain the highest number of methods?

MATCH
  (class:Class)-[:DECLARES]->(method:Method)
RETURN
  class.fqn, count(method) as Methods
ORDER BY
  Methods DESC
LIMIT 20

Which class has the deepest inheritance hierarchy?

MATCH
  h=(class:Class)-[:EXTENDS*]->(super:Type)
RETURN
  class.fqn, length(h) as Depth
ORDER BY
  Depth desc
LIMIT 20

Which classes are affected by IOExceptions?

	 	 
MATCH	 	 
 (e:Type)-[:DECLARES]->(init:Constructor)	 	 
WHERE	 	 
 e.fqn='java.io.IOException'	 	 
WITH	 	 
 e,init	 	 
MATCH	 	 
 (type:Type)-[:DECLARES]->(method:Method),	 	 
 path=(method)‐[:INVOKES*]->(init)	 	 
RETURN	 	 
 e,type,path	 	 
LIMIT 10

Did you find something interesting? Which query did you use? You’re invited to leave a comment!

About the author:

Dirk Mahler

@dirkmahler

Tags: Demo Exploration Java

2 Comments

Prav - 30. April 2018 - 8:23

Antworten /

How to explore on lambdas and Consumer constructs?

Dirk Mahler - 4. Mai 2018 - 15:45

Antworten /

The question has been discussed & answered on Stackoverflow, hope it works for you!