Javaクラス名ランキング

クラス名を考える

プログラミングにおいて命名は重要な要素ですが、絶対的な正解があるとは限らない分野でもあります。
命名に関する情報は書籍やネットでも多くありますが、特に設計やレビューなどで人と話し合うとき、個人感覚だけだと、その経験や考え方に左右され、他の人には納得しづらい命名になることもありえます。
そこで今回は参考の一つとして採用実績を一つの指標と出来るよう、標準APIやフレームワーク、ライブラリなどで使用されているクラスの命名をランキングにしてみました。

ランキング

Java SE 8

順位	Prefix	出現回数	Suffix	出現回数
1	Basic	77	Exception	434
2	J	67	UI	172
3	Metal	54	Helper	129
4	Abstract	52	Event	83
5	Default	51	Listener	79
6	Invalid	51	Factory	75
7	Key	48	Type	66
8	Synth	48	Holder	64
9	File	46	Stream	63
10	Xml	44	Handler	50
11	Dyn	40	Context	49
12	Object	37	Info	48
13	Multi	35	Operations	48
14	XML	34	Model	46
15	Accessible	28	Spec	44
16	M	26	View	39
17	SOAP	26	Manager	36
18	Image	26	Provider	36
19	Job	25	Error	36
20	Data	25	Set	35
21	Print	24	Permission	33
22	Attribute	23	Border	33
23	Service	23	Spi	30
24	SQL	22	Action	29
25	Row	22	Bean	29
26	No	22	Key	28
27	Type	22	Map	26
28	Name	22	Resource	26
29	Bean	22	Support	25
30	String	21	Channel	25
31	SSL	21	Value	25
32	Not	21	Impl	25
33	Long	20	Policy	25
34	Simple	20	Filter	24
35	Cert	20	Element	24
36	Illegal	20	Object	23
37	Servant	19	List	23
38	Input	19	Name	23
39	DOM	18	Attribute	22
40	Text	18	Adapter	21
41	IIO	18	Result	21
42	Double	18	Writer	20
43	Naming	18	Source	20
44	Unknown	18	Stub	19
45	Policy	18	Reader	19
46	Printer	18	Function	18
47	Document	17	Constants	18
48	Binding	17	Service	16
49	Web	17	Queue	15
50	RMI	17	Reference	15
51	Menu	16	Layout	14
52	Date	16	Format	14
53	Event	16	Editor	14
54	Certificate	16	Data	13
55	Element	16	Iterator	13
56	Thread	16	Pane	13
57	Tree	16	Entry	12
58	Server	15	Delegate	12
59	X	15	Mode	12
60	JMX	15	Callback	12
61	Open	14	Control	12
62	Table	14	Buffer	12
63	Socket	13	Icon	11
64	List	13	Formatter	11
65	Midi	13	Parameters	11
66	Atomic	13	Field	11
67	Int	13	Descriptor	11
68	Component	12	Style	10
69	Mouse	12	Consumer	10
70	Property	12	Connection	10
71	Class	12	Binding	10
72	Media	12	Operator	10
73	Relation	12	Time	10
74	Doc	12	Resolver	10
75	Activation	12	Notification	9
76	Value	12	Component	9
77	HTML	12	Op	9
78	EC	11	Document	9
79	Standard	11	Supported	9
80	Drag	11	Attributes	9
81	IOR	11	Method	9
82	Unsupported	11	Painter	9
83	Adapter	11	Proxy	9
84	RSA	11	Table	9
85	Border	11	Builder	9
86	Stream	11	Ref	8
87	Memory	10	Lock	8
88	Audio	10	Option	8
89	Styled	10	Array	8
90	URL	10	Node	8
91	Style	10	Renderer	8
92	LS	10	Date	8
93	Current	10	Button	8
94	Line	10	Syntax	8
95	Color	10	Param	8
96	Number	10	Selector	8
97	Acl	9	Location	8
98	URI	9	Visitor8	8
99	DSA	9	Visitor6	8
100	Array	9	Visitor7	8

Java EE 7

順位	Prefix	出現回数	Suffix	出現回数
1	Html	62	Exception	215
2	Message	44	Context	70
3	Xml	42	Listener	62
4	UI	29	Type	60
5	SOAP	28	Event	53
6	Web	27	Factory	53
7	Servlet	27	Handler	43
8	Client	27	Holder	32
9	Http	26	Keys	31
10	Json	25	Wrapper	30
11	Connection	22	Stats	24
12	Transaction	21	Term	23
13	Tag	21	Resolver	23
14	JMS	20	Converter	20
15	Resource	20	Builder	20
16	Constraint	18	Info	18
17	EJB	16	Manager	18
18	Faces	16	Tag	18
19	Pre	16	Config	18
20	Abstract	16	Provider	17
21	Entity	15	Node	16
22	Persistence	15	Message	16
23	Validation	14	Descriptor	15
24	Post	14	Validator	15
25	Server	13	Target	14
26	Jsp	13	Connection	14
27	Method	13	Element	14
28	Managed	13	Bean	14
29	View	13	Adapter	13
30	Session	13	Scoped	13
31	Process	12	Callback	12
32	Not	12	Attribute	12
33	XA	12	Param	11
34	Work	12	Expression	11
35	Named	12	Result	11
36	Job	12	Mode	11
37	Map	11	Object	11
38	Flow	11	Binding	10
39	Service	11	Stream	10
40	EL	10	Service	10
41	Application	10	Data	10
42	Invalid	10	Session	10
43	No	10	Query	9
44	Validator	10	Request	9
45	Bean	10	Model	9
46	Mime	9	Column	9
47	JAXB	9	Part	8
48	Action	9	Permission	8
49	Criteria	9	Impl	8
50	Queue	8	Support	8
51	Parameter	8	Definition	8
52	Deployment	8	Response	8
53	Value	8	Link	7
54	Annotated	8	Definitions	7
55	Behavior	8	Parameter	7
56	Response	8	Endpoint	7
57	Facelet	7	Writer	7
58	Async	7	Status	6
59	Topic	7	Method	6
60	Attribute	7	Delegate	6
61	Context	7	Join	6
62	Partition	7	Value	6
63	Provider	7	Configuration	6
64	Converter	7	Feature	6
65	Handler	7	Statistic	6
66	Exception	7	Filter	6
67	Query	6	Home	5
68	Path	6	Address	5
69	State	6	Property	5
70	Private	6	Transaction	5
71	Folder	6	Mapper	5
72	Property	6	Container	5
73	Result	6	Base	5
74	Visit	6	Scope	5
75	Auth	6	Servlet	5
76	Item	6	Table	5
77	Local	6	Source	5
78	Illegal	6	Path	4
79	Type	6	Execution	4
80	Generic	6	Form	4
81	Data	6	Root	4
82	External	5	Id	4
83	Byte	5	Reader	4
84	Join	5	Registration	4
85	Expression	5	Timeout	4
86	Remote	5	Consumer	4
87	Body	5	Header	4
88	Endpoint	5	Constraint	4
89	Header	5	Renderer	4
90	After	5	Interceptor	4
91	Fetch	5	Registry	4
92	Container	5	Reference	4
93	Partial	5	Attributes	4
94	Element	5	Behavior	4
95	Request	5	Resource	4
96	Registry	5	Producer	4
97	Filter	5	Entity	3
98	Policy	5	Util	3
99	Navigation	5	String	3
100	Store	4	Instance	3

Spring Framework 4.2.4

順位	Prefix	出現回数	Suffix	出現回数
1	Abstract	238	Exception	258
2	Simple	88	Resolver	161
3	Default	81	Factory	125
4	Bean	75	Utils	114
5	Web	73	Bean	111
6	Mock	68	Handler	110
7	Spring	50	Source	88
8	Request	45	Interceptor	73
9	Resource	43	Context	72
10	Message	43	Adapter	61
11	Http	42	Converter	52
12	Transaction	41	Support	51
13	Servlet	41	Processor	47
14	Method	40	Manager	43
15	Annotation	39	View	43
16	Hibernate	38	Tag	38
17	Jms	35	Parser	37
18	Sql	33	Editor	37
19	Generic	33	Listener	36
20	Property	31	Request	36
21	Handler	30	Loader	36
22	Aspect	27	Filter	35
23	Portlet	27	Accessor	35
24	Standard	26	Registry	34
25	Delegating	25	Strategy	34
26	Async	25	Configurer	33
27	Local	24	Configuration	32
28	Session	24	Provider	32
29	Cache	23	Builder	30
30	Context	20	Mapping	29
31	Managed	20	Callback	26
32	Stomp	19	Definition	24
33	J	18	Executor	24
34	Configurable	18	Advisor	23
35	Type	18	Creator	23
36	Remote	17	Holder	23
37	Model	17	Exporter	22
38	Jndi	16	Operations	22
39	Sock	16	Resource	22
40	Xml	16	Aware	22
41	M	15	Type	20
42	Smart	15	Template	20
43	Op	15	Registration	20
44	Open	15	Message	20
45	Class	15	Session	20
46	Simp	15	Extractor	19
47	Response	15	Advice	19
48	Mapping	14	Event	18
49	Invalid	14	Proxy	18
50	Connection	14	Incrementer	17
51	Script	14	Matchers	17
52	Enable	13	Controller	17
53	Concurrent	13	Value	16
54	Data	13	Matcher	15
55	Date	13	Comparator	15
56	Test	12	Condition	15
57	Application	12	Helper	15
58	Aop	12	Operation	15
59	Composite	12	Generator	14
60	Proxy	12	Info	14
61	Custom	12	Reference	14
62	Task	11	Config	14
63	Destination	11	Response	14
64	View	11	Registrar	13
65	Content	11	Pointcut	13
66	User	11	Result	13
67	Spel	11	Formatter	13
68	Velocity	11	Translator	12
69	Commons	10	Initializer	12
70	Reflective	10	Attribute	12
71	Caching	10	Map	12
72	No	10	Status	11
73	Jdbc	10	Metadata	11
74	Groovy	10	Reader	11
75	Persistence	9	Attributes	11
76	Path	9	Service	11
77	Mime	9	Scope	10
78	Url	9	Weaver	10
79	Static	9	Assembler	10
80	Object	9	Synchronization	9
81	Named	9	Mapper	9
82	String	8	Decorator	9
83	Embedded	8	Mode	9
84	Uri	8	Wrapper	8
85	Scheduled	8	Method	8
86	Expression	8	Entry	8
87	Jasper	8	Parameter	8
88	Free	8	Container	8
89	Properties	8	Literal	8
90	Yaml	8	Cache	8
91	Cannot	8	Locator	8
92	Cors	8	Selector	8
93	Jta	7	Marshaller	8
94	Advisor	7	Expression	8
95	Parameter	7	Lookup	8
96	Reflection	7	Client	8
97	Listenable	7	Environment	8
98	Map	7	Transport	7
99	Rmi	7	Chain	7
100	Locale	7	Visitor	7

Apache Tomcat 8

順位	Prefix	出現回数	Suffix	出現回数
1	Abstract	65	Factory	56
2	Ast	43	Constants	45
3	Constants	42	Handler	34
4	Jsp	30	Listener	33
5	File	27	Base	33
6	Ws	25	Exception	33
7	Standard	23	Element	32
8	Context	20	Filter	32
9	SSI	19	Task	31
10	EL	18	Impl	30
11	Nio	18	Set	27
12	Jar	15	Stream	26
13	JMX	14	SF	23
14	Store	13	Bean	23
15	Ajp	13	Manager	21
16	Extended	13	Valve	20
17	Cluster	13	Config	19
18	Pojo	13	Context	18
19	Channel	13	Buffer	18
20	Async	12	Processor	17
21	Class	12	Util	15
22	Request	11	Pool	15
23	Base	11	Info	15
24	Apr	10	Wrapper	15
25	Naming	10	Rule	15
26	Message	10	Sender	14
27	Session	10	Interceptor	14
28	Pool	9	Utils	12
29	Application	9	Servlet	12
30	Default	9	Resource	12
31	SSL	9	Entry	11
32	Lifecycle	9	Parser	11
33	Security	9	Message	11
34	Web	9	Source	11
35	Resource	9	Data	11
36	User	9	Ref	10
37	Memory	8	State	10
38	Set	8	Cache	10
39	Tld	8	Callback	10
40	Rewrite	8	Realm	10
41	Constant	8	Type	10
42	Remote	8	Channel	10
43	Comet	8	Loader	10
44	Internal	8	Map	9
45	Pooled	8	Protocol	8
46	Tag	8	Event	8
47	Generic	8	Expression	7
48	Data	8	Value	7
49	Instance	7	Authenticator	7
50	Byte	7	Support	7

Apache Commons Lang 3.4

順位	Prefix	出現回数	Suffix	出現回数
1	Mutable	11	Utils	32
2	Char	6	Builder	9
3	Str	5	Initializer	8
4	Concurrent	4	Exception	7
5	Date	4	Translator	4
6	Diff	3	Unescaper	3
7	Numeric	3	Escaper	3
8	Unicode	3	Triple	3
9	Class	3	Format	3
10	Fast	3	Style	3

Google Guava

順位	Prefix	出現回数	Suffix	出現回数
1	Forwarding	36	Map	22
2	Immutable	34	Multimap	16
3	Abstract	17	Future	12
4	Hash	6	Multiset	11
5	Byte	6	Service	10
6	Char	6	Set	9
7	Multimap	6	Cache	8
8	Tree	6	Table	7
9	Cache	6	Builder	7
10	Cycle	5	Stream	7
11	Map	5	Iterator	7
12	Finalizable	5	Exception	7
13	Array	5	Escaper	6
14	Unsigned	5	Map.Builder	6
15	Type	4	Queue	5
16	Removal	4	Math	4
17	Class	4	Escapers	4
18	Enum	3	Limiter	4
19	Sorted	3	Reference	4
20	Listenable	3	Supplier	3

ランキングを支える技術

このランキングはJavaを使って、公開されているJavadocからHttpアクセスで一覧を取得し、変換、集計、ソート、マークダウン出力を行っています。
そのため、Javadocが公開されていれば、同じようにランキングが作成できます。

Ranking.java

import org.jsoup.Jsoup;
import org.jsoup.nodes.Element;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.IntStream;

import static java.util.function.Function.identity;
import static java.util.stream.Collectors.*;

public class Ranking {

    public static void main(String[] args) {
        Stream.<Triple<String, String, Integer>>of(
                new Triple<>("Java SE 8", "http://docs.oracle.com/javase/8/docs/api", 100),
                new Triple<>("Java EE 7", "http://docs.oracle.com/javaee/7/api", 100),
                new Triple<>("Spring Framework 4.2.4", "http://docs.spring.io/spring/docs/current/javadoc-api", 100),
                new Triple<>("Apache Tomcat 8", "http://tomcat.apache.org/tomcat-8.0-doc/api", 50),
                new Triple<>("Apache Commons Lang 3.4", "https://commons.apache.org/proper/commons-lang/javadocs/api-3.4", 10),
                new Triple<>("Google Guava 19", "http://docs.guava-libraries.googlecode.com/git/javadoc", 20))
                .map(Ranking::create)
                .forEach(Ranking::output);
    }

    static Triple<String, List<List<Map.Entry<String, Long>>>, Integer> create(Triple<String, String, Integer> p) {
        return new Triple<>(p.l, Arrays.asList(get(p.m, t -> t[0]), get(p.m, t -> t[t.length - 1])), p.r);
    }

    static List<Map.Entry<String, Long>> get(String url, Function<String[], String> target) {
        try {
            return Jsoup.connect(url + "/allclasses-frame.html").get()
                    .select(".indexContainer li")
                    .stream()
                    .map(Element::text)
                    .map(t -> t.split("(?<=[A-Z])(?=[A-Z][a-z])|(?<=[a-z])(?=[A-Z])"))
                    .map(target)
                    .collect(groupingBy(identity(), counting()))
                    .entrySet()
                    .stream()
                    .sorted(Map.Entry.<String, Long>comparingByValue().reversed())
                    .collect(toList());

        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    static void output(Triple<String, List<List<Map.Entry<String, Long>>>, Integer> p) {
        System.out.println(String.format("## %s", p.l));
        System.out.println("|順位|Prefix|出現回数|Suffix|出現回数|");
        System.out.println("|:--|:--|:--|:--|:--|");
        IntStream.range(0, p.r).forEach(i -> System.out.println(String.format("|%d|%s|%s|%s|%s|", i + 1,
                p.m.get(0).get(i).getKey(), p.m.get(0).get(i).getValue(),
                p.m.get(1).get(i).getKey(), p.m.get(1).get(i).getValue())));
    }

    static class Triple<L,M,R> {
        L l;
        M m;
        R r;
        Triple(L l, M m, R r) {
            this.l = l;
            this.m = m;
            this.r = r;
        }
    }
}

あと、ざっくり作ったのでバグがあるかもしれません。もしも間違っているようなら、修正リクエストをもらえると助かりますｗ

注意事項

• ランキングは件数で区切っているため、同じ出現回数の単語でもラインキング外になっている場合があります。
• クラス名が単一の単語(String, Integerなど)の場合は、Prefix、Suffix双方としてカウントされます。