Statistics of Open Source Projects

For our testing we measured open source projects on GitHub.

The following statistics show results on those projects. The jSparrow Eclipse Plugin has been used to produce the results.

Summary of Statistics

This is a summary of all statistics seen below. For a summary table of the individual rules, have a look at the Statistics Summary page.

Total Java file* count	19792
Number of files changed	12581
Total number of issues fixed	228616
Total time saved	15997 hours, 33 minutes
Total jSparrow run time	20 minutes, 34 seconds

* One Java file could contain more than one Java class.

No license required

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Individual Statistics

Here, the statistics for each open source project can be seen individually. Please click on the tab headers to switch between projects.

jSparrow results for cucumber-jvm

Metrics for cucumber-jvm (created on 25.2.2021):

Total Java file* count	1509
Number of files changed	392
Total number of issues fixed	6697
Total time saved	406 hours, 37 minutes
jSparrow run time	30 seconds

* One Java file could contain more than one Java class.

Per Rule Statistics

This table contains the list of rules that were applied on cucumber-jvm.

arrow_upwardRule Name	arrow_upwardIssues Fixed	arrow_upwardFiles Changed	arrow_upwardTime saved
Add Braces to Control Statements	48	18	1 hour, 36 minutes
Collapse If Statements	2	2	10 minutes
Hide Default Constructor In Utility Classes	17	17	1 hour, 25 minutes
Make Fields And Variables Final	3155	328	262 hours, 55 minutes
Remove Boxing for String Conversions	3	3	15 minutes
Remove Collection::addAll	2	2	4 minutes
Remove Explicit Type Argument	5	2	5 minutes
Remove Lambda Expression Braces	43	23	3 hours, 35 minutes
Remove Unnecessary Thrown Exceptions on Method Signatures	14	11	28 minutes
Remove Unused Parameters in Private Methods	5	4	25 minutes
Reorder Modifiers	4	3	8 minutes
Reorder String Equality Check	8	5	1 hour, 20 minutes
Replace Assignment with Compound Operator	2	1	4 minutes
Replace Expression Lambda with Method Reference	34	19	1 hour, 8 minutes
Replace For-Loop with Iterable::forEach	70	39	17 hours, 30 minutes
Replace For-Loop with Stream::Match	1	1	2 minutes
Replace put(..) with putIfAbsent(..)	5	3	10 minutes
Replace static final Collections with Collections.unmodifiable...()	5	4	50 minutes
Replace While-Loop with Enhanced For-Loop	1	1	5 minutes
Split Multiple Variable Declarations	1	1	2 minutes
Use @Override Annotation	32	14	2 hours, 40 minutes
Use BufferedReader::lines	1	1	5 minutes
Use Collections Singleton List	4	2	8 minutes
Use Factory Methods for Collections	8	5	40 minutes
Use Guard Condition	31	27	2 hours, 35 minutes
Use Local Variable Type Inference	2723	303	90 hours, 46 minutes
Use Portable Newline	3	3	3 minutes
Use SecureRandom	1	1	5 minutes
Use Stream::filter	3	3	15 minutes
Use Stream::map	7	7	1 hour, 45 minutes
Use StringBuilder::append	459	138	15 hours, 18 minutes

* One Java file could contain more than one Java class.

---

jSparrow results for jenkins-core

Metrics for jenkins-core (created on 28.1.2021):

Total Java file* count	1323
Number of files changed	937
Total number of issues fixed	13675
Total time saved	1034 hours, 43 minutes
jSparrow run time	2 minutes, 44 seconds

* One Java file could contain more than one Java class.

Per Rule Statistics

This table contains the list of rules that were applied on jenkins-core.

arrow_upwardRule Name	arrow_upwardIssues Fixed	arrow_upwardFiles Changed	arrow_upwardTime saved
Add Braces to Control Statements	2293	390	76 hours, 26 minutes
Collapse If Statements	54	45	4 hours, 30 minutes
Create Temp Files Using Java NIO	19	15	1 hour, 35 minutes
Hide Default Constructor In Utility Classes	46	46	3 hours, 50 minutes
Make Fields And Variables Final	7138	731	594 hours, 50 minutes
Remove Boxing for String Conversions	1	1	5 minutes
Remove Collection::addAll	5	4	10 minutes
Remove Explicit Call To super()	6	5	6 minutes
Remove Explicit Type Argument	7	5	7 minutes
Remove Inherited Interfaces from Class Declaration	10	6	20 minutes
Remove Lambda Expression Braces	304	144	25 hours, 20 minutes
Remove Null-Checks Before Instanceof	1	1	5 minutes
Remove Redundant Type Casts	11	11	55 minutes
Remove Unnecessary Semicolons	4	4	4 minutes
Remove Unnecessary Thrown Exceptions on Method Signatures	158	75	5 hours, 16 minutes
Remove Unused Parameters in Private Methods	4	4	20 minutes
Reorder Modifiers	148	71	4 hours, 56 minutes
Reorder String Equality Check	114	58	19 hours
Replace Assignment with Compound Operator	5	3	10 minutes
Replace Equality Check with isEmpty()	47	31	1 hour, 34 minutes
Replace equals() on Enum Constants	14	7	1 hour, 10 minutes
Replace Expression Lambda with Method Reference	84	51	2 hours, 48 minutes
Replace For-Loop with Iterable::forEach	384	155	96 hours
Replace For-Loop with Stream::findFirst	52	30	1 hour, 44 minutes
Replace For-Loop with Stream::Match	28	22	56 minutes
Replace JUnit Timeout Annotation Property with assertTimeout	3	1	15 minutes
Replace Map::get by Map::getOrDefault	1	1	2 minutes
Replace put(..) with putIfAbsent(..)	8	6	16 minutes
Replace static final Collections with Collections.unmodifiable...()	3	3	30 minutes
Reuse Random Objects	4	3	20 minutes
Split Multiple Variable Declarations	53	35	1 hour, 46 minutes
Use @Override Annotation	1403	368	116 hours, 55 minutes
Use BufferedReader::lines	2	2	10 minutes
Use Comparator Methods	1	1	5 minutes
Use Functional Interfaces	102	55	8 hours, 30 minutes
Use Guard Condition	157	106	13 hours, 5 minutes
Use Multi Catch	2	2	10 minutes
Use SecureRandom	7	7	35 minutes
Use Stream::collect	32	21	8 hours
Use Stream::filter	82	57	6 hours, 50 minutes
Use Stream::map	26	22	6 hours, 30 minutes
Use String Literals	1	1	5 minutes
Use StringBuilder::append	851	310	28 hours, 22 minutes

* One Java file could contain more than one Java class.

---

jSparrow results for neo4j-community

Metrics for neo4j-community (created on 10.2.2021):

Total Java file* count	5641
Number of files changed	3541
Total number of issues fixed	81621
Total time saved	5104 hours, 10 minutes
jSparrow run time	5 minutes, 39 seconds

* One Java file could contain more than one Java class.

Per Rule Statistics

This table contains the list of rules that were applied on neo4j-community.

arrow_upwardRule Name	arrow_upwardIssues Fixed	arrow_upwardFiles Changed	arrow_upwardTime saved
Collapse If Statements	56	48	4 hours, 40 minutes
Hide Default Constructor In Utility Classes	92	92	7 hours, 40 minutes
Make Fields And Variables Final	44173	3213	3681 hours, 5 minutes
Remove Boxing for String Conversions	22	14	1 hour, 50 minutes
Remove Collection::addAll	16	11	32 minutes
Remove Explicit Call To super()	28	26	28 minutes
Remove Explicit Type Argument	6	5	6 minutes
Remove Inherited Interfaces from Class Declaration	7	7	14 minutes
Remove Lambda Expression Braces	284	198	23 hours, 40 minutes
Remove Redundant Type Casts	57	23	4 hours, 45 minutes
Remove Unnecessary Thrown Exceptions on Method Signatures	264	90	8 hours, 48 minutes
Remove Unused Parameters in Private Methods	16	10	1 hour, 20 minutes
Reorder String Equality Check	73	40	12 hours, 10 minutes
Replace Assignment with Compound Operator	10	7	20 minutes
Replace Equality Check with isEmpty()	1	1	2 minutes
Replace equals() on Enum Constants	29	20	2 hours, 25 minutes
Replace Expression Lambda with Method Reference	130	77	4 hours, 20 minutes
Replace For-Loop with Enhanced-For-Loop	5	4	25 minutes
Replace For-Loop with Iterable::forEach	427	256	106 hours, 45 minutes
Replace For-Loop with Stream::findFirst	8	7	16 minutes
Replace For-Loop with Stream::Match	7	7	14 minutes
Replace indexOf() with contains()	1	1	2 minutes
Replace put(..) with putIfAbsent(..)	4	4	8 minutes
Replace static final Collections with Collections.unmodifiable...()	6	5	1 hour
Replace While-Loop with Enhanced For-Loop	4	4	20 minutes
Reuse Random Objects	9	6	45 minutes
Split Multiple Variable Declarations	67	23	2 hours, 14 minutes
Use @Override Annotation	89	32	7 hours, 25 minutes
Use BufferedReader::lines	1	1	5 minutes
Use Collections Singleton List	84	27	2 hours, 48 minutes
Use equals() on Primitive Objects	2	1	4 minutes
Use Factory Methods for Collections	8	2	40 minutes
Use Files.writeString	1	1	5 minutes
Use Functional Interfaces	2	2	10 minutes
Use Guard Condition	577	414	48 hours, 5 minutes
Use Local Variable Type Inference	32953	2819	1098 hours, 26 minutes
Use Multi Catch	1	1	5 minutes
Use Optional::filter	1	1	2 minutes
Use Optional::ifPresent	3	3	6 minutes
Use Optional::map	3	3	6 minutes
Use Portable Newline	4	3	4 minutes
Use SecureRandom	23	18	1 hour, 55 minutes
Use Stream::filter	26	21	2 hours, 10 minutes
Use Stream::map	17	14	4 hours, 15 minutes
Use String Join	1	1	5 minutes
Use String Literals	2	1	10 minutes
Use StringBuilder::append	2005	864	66 hours, 50 minutes
Use Try-With-Resource	16	7	4 hours

* One Java file could contain more than one Java class.

---

jSparrow results for orientdb-core

Metrics for orientdb-core (created on 1.2.2021):

Total Java file* count	2503
Number of files changed	1795
Total number of issues fixed	38067
Total time saved	2438 hours, 35 minutes
jSparrow run time	3 minutes, 1 second

* One Java file could contain more than one Java class.

Per Rule Statistics

This table contains the list of rules that were applied on orientdb-core.

arrow_upwardRule Name	arrow_upwardIssues Fixed	arrow_upwardFiles Changed	arrow_upwardTime saved
Add Braces to Control Statements	11864	760	395 hours, 28 minutes
Collapse If Statements	156	86	13 hours
Hide Default Constructor In Utility Classes	58	58	4 hours, 50 minutes
Insert Break Statements in For-loops	2	1	4 minutes
Make Fields And Variables Final	14672	1331	1222 hours, 40 minutes
Remove Boxing for String Conversions	13	11	1 hour, 5 minutes
Remove Collection::addAll	34	15	1 hour, 8 minutes
Remove Explicit Call To super()	24	22	24 minutes
Remove Explicit Type Argument	1574	339	26 hours, 14 minutes
Remove Inherited Interfaces from Class Declaration	10	9	20 minutes
Remove Lambda Expression Braces	556	223	46 hours, 20 minutes
Remove Modifiers in Interface Properties	625	41	10 hours, 25 minutes
Remove Null-Checks Before Instanceof	53	30	4 hours, 25 minutes
Remove Redundant Type Casts	94	55	7 hours, 50 minutes
Remove toString() on String	6	5	12 minutes
Remove Unnecessary Semicolons	297	9	4 hours, 57 minutes
Remove Unnecessary Thrown Exceptions on Method Signatures	401	213	13 hours, 22 minutes
Remove Unused Parameters in Private Methods	72	42	6 hours
Reorder String Equality Check	428	107	71 hours, 20 minutes
Replace Assignment with Compound Operator	14	11	28 minutes
Replace Collection.sort with List.sort	8	6	16 minutes
Replace Equality Check with isEmpty()	68	41	2 hours, 16 minutes
Replace equals() on Enum Constants	92	22	7 hours, 40 minutes
Replace Expression Lambda with Method Reference	351	171	11 hours, 42 minutes
Replace For-Loop with Enhanced-For-Loop	33	28	2 hours, 45 minutes
Replace For-Loop with Iterable::forEach	863	297	215 hours, 45 minutes
Replace For-Loop with Stream::findFirst	2	2	4 minutes
Replace For-Loop with Stream::Match	75	30	2 hours, 30 minutes
Replace indexOf() with contains()	7	4	14 minutes
Replace Inefficient Constructors with valueOf()	84	16	7 hours
Replace Nested Loops with flatMap	2	2	30 minutes
Replace put(..) with putIfAbsent(..)	2	2	4 minutes
Replace While-Loop with Enhanced For-Loop	40	4	3 hours, 20 minutes
Reuse Random Objects	50	19	4 hours, 10 minutes
Split Multiple Variable Declarations	5	3	10 minutes
StringBuffer() to StringBuilder()	6	5	12 minutes
Use @Override Annotation	2245	497	187 hours, 5 minutes
Use Collections Singleton List	44	13	1 hour, 28 minutes
Use equals() on Primitive Objects	8	6	16 minutes
Use Functional Interfaces	59	34	4 hours, 55 minutes
Use Guard Condition	438	278	36 hours, 30 minutes
Use Multi Catch	125	17	10 hours, 25 minutes
Use Optional::ifPresent	1	1	2 minutes
Use Portable Newline	14	5	14 minutes
Use Predefined Standard Charset	7	3	14 minutes
Use SecureRandom	147	46	12 hours, 15 minutes
Use Stream::collect	7	5	1 hour, 45 minutes
Use Stream::filter	84	43	7 hours
Use Stream::map	41	30	10 hours, 15 minutes
Use String Join	3	2	15 minutes
Use String Literals	6	3	30 minutes
Use StringBuilder::append	2183	554	72 hours, 46 minutes
Use Try-With-Resource	14	6	3 hours, 30 minutes

* One Java file could contain more than one Java class.

---

jSparrow results for rocketmq

Metrics for rocketmq (created on 25.2.2021):

Total Java file* count	984
Number of files changed	714
Total number of issues fixed	10827
Total time saved	844 hours, 59 minutes
jSparrow run time	43 seconds

* One Java file could contain more than one Java class.

Per Rule Statistics

This table contains the list of rules that were applied on rocketmq.

arrow_upwardRule Name	arrow_upwardIssues Fixed	arrow_upwardFiles Changed	arrow_upwardTime saved
Add Braces to Control Statements	494	86	16 hours, 28 minutes
Avoid Concatenation in Logging Statements	4	3	20 minutes
Collapse If Statements	54	38	4 hours, 30 minutes
Create Temp Files Using Java NIO	1	1	5 minutes
Hide Default Constructor In Utility Classes	69	69	5 hours, 45 minutes
Make Fields And Variables Final	7744	607	645 hours, 20 minutes
Remove Boxing for String Conversions	3	3	15 minutes
Remove Collection::addAll	10	9	20 minutes
Remove Explicit Call To super()	16	13	16 minutes
Remove Explicit Type Argument	563	231	9 hours, 23 minutes
Remove Inherited Interfaces from Class Declaration	12	12	24 minutes
Remove Lambda Expression Braces	136	86	11 hours, 20 minutes
Remove Modifiers in Interface Properties	5	2	5 minutes
Remove Null-Checks Before Instanceof	11	8	55 minutes
Remove Redundant Type Casts	5	4	25 minutes
Remove toString() on String	2	2	4 minutes
Remove Unnecessary Thrown Exceptions on Method Signatures	22	8	44 minutes
Remove Unused Parameters in Private Methods	61	9	5 hours, 5 minutes
Reorder Modifiers	127	46	4 hours, 14 minutes
Reorder String Equality Check	26	12	4 hours, 20 minutes
Replace Assignment with Compound Operator	6	6	12 minutes
Replace Collection.sort with List.sort	1	1	2 minutes
Replace Equality Check with isEmpty()	6	6	12 minutes
Replace equals() on Enum Constants	36	8	3 hours
Replace Expression Lambda with Method Reference	38	29	1 hour, 16 minutes
Replace For-Loop with Enhanced-For-Loop	10	10	50 minutes
Replace For-Loop with Iterable::forEach	236	119	59 hours
Replace For-Loop with Stream::findFirst	8	4	16 minutes
Replace For-Loop with Stream::Match	4	4	8 minutes
Replace Inefficient Constructors with valueOf()	23	5	1 hour, 55 minutes
Replace put(..) with putIfAbsent(..)	1	1	2 minutes
Replace While-Loop with Enhanced For-Loop	7	6	35 minutes
Reuse Random Objects	4	4	20 minutes
Split Multiple Variable Declarations	13	8	26 minutes
StringBuffer() to StringBuilder()	14	11	28 minutes
Use @Override Annotation	196	53	16 hours, 20 minutes
Use equals() on Primitive Objects	2	2	4 minutes
Use Functional Interfaces	130	70	10 hours, 50 minutes
Use Guard Condition	132	70	11 hours
Use Multi Catch	7	5	35 minutes
Use Portable Newline	4	2	4 minutes
Use Predefined Standard Charset	10	8	20 minutes
Use SecureRandom	21	15	1 hour, 45 minutes
Use Stream::collect	1	1	15 minutes
Use Stream::filter	19	16	1 hour, 35 minutes
Use Stream::map	24	18	6 hours
Use StringBuilder::append	508	190	16 hours, 56 minutes
Use Try-With-Resource	1	1	15 minutes

* One Java file could contain more than one Java class.

---

jSparrow results for spring-boot

Metrics for spring-boot (created on 1.2.2021):

Total Java file* count	634
Number of files changed	339
Total number of issues fixed	2237
Total time saved	187 hours, 19 minutes
jSparrow run time	18 seconds

* One Java file could contain more than one Java class.

Per Rule Statistics

This table contains the list of rules that were applied on spring-boot.

arrow_upwardRule Name	arrow_upwardIssues Fixed	arrow_upwardFiles Changed	arrow_upwardTime saved
Avoid Concatenation in Logging Statements	1	1	5 minutes
Collapse If Statements	4	4	20 minutes
Hide Default Constructor In Utility Classes	2	2	10 minutes
Make Fields And Variables Final	1718	309	143 hours, 10 minutes
Remove Collection::addAll	5	4	10 minutes
Remove Explicit Call To super()	1	1	1 minute
Remove Lambda Expression Braces	54	37	4 hours, 30 minutes
Remove Unnecessary Thrown Exceptions on Method Signatures	55	37	1 hour, 50 minutes
Remove Unused Parameters in Private Methods	5	4	25 minutes
Reorder String Equality Check	4	2	40 minutes
Replace equals() on Enum Constants	2	1	10 minutes
Replace Expression Lambda with Method Reference	15	13	30 minutes
Replace For-Loop with Iterable::forEach	80	48	20 hours
Replace For-Loop with Stream::findFirst	4	4	8 minutes
Replace For-Loop with Stream::Match	2	2	4 minutes
Replace static final Collections with Collections.unmodifiable...()	2	2	20 minutes
Replace While-Loop with Enhanced For-Loop	1	1	5 minutes
Use Collections Singleton List	2	2	4 minutes
Use equals() on Primitive Objects	2	2	4 minutes
Use Guard Condition	84	61	7 hours
Use SecureRandom	1	1	5 minutes
Use Stream::filter	11	10	55 minutes
Use Stream::map	2	2	30 minutes
Use String Join	1	1	5 minutes
Use StringBuilder::append	179	114	5 hours, 58 minutes

* One Java file could contain more than one Java class.

---

jSparrow results for vert.x

Metrics for vert.x (created on 25.2.2021):

Total Java file* count	850
Number of files changed	557
Total number of issues fixed	13770
Total time saved	1118 hours, 7 minutes
jSparrow run time	1 minute, 33 seconds

* One Java file could contain more than one Java class.

Per Rule Statistics

This table contains the list of rules that were applied on vert.x.

arrow_upwardRule Name	arrow_upwardIssues Fixed	arrow_upwardFiles Changed	arrow_upwardTime saved
Add Braces to Control Statements	144	46	4 hours, 48 minutes
Collapse If Statements	27	21	2 hours, 15 minutes
Create Temp Files Using Java NIO	6	6	30 minutes
Hide Default Constructor In Utility Classes	51	51	4 hours, 15 minutes
Make Fields And Variables Final	10001	472	833 hours, 25 minutes
Remove Boxing for String Conversions	23	13	1 hour, 55 minutes
Remove Collection::addAll	1	1	2 minutes
Remove Explicit Call To super()	24	20	24 minutes
Remove Explicit Type Argument	2	2	2 minutes
Remove Inherited Interfaces from Class Declaration	5	3	10 minutes
Remove Lambda Expression Braces	1701	135	141 hours, 45 minutes
Remove Redundant Type Casts	13	7	1 hour, 5 minutes
Remove toString() on String	1	1	2 minutes
Remove Unnecessary Semicolons	5	4	5 minutes
Remove Unnecessary Thrown Exceptions on Method Signatures	146	45	4 hours, 52 minutes
Remove Unused Parameters in Private Methods	16	10	1 hour, 20 minutes
Reorder Modifiers	39	10	1 hour, 18 minutes
Reorder String Equality Check	54	27	9 hours
Replace Collection.sort with List.sort	2	1	4 minutes
Replace Equality Check with isEmpty()	8	3	16 minutes
Replace equals() on Enum Constants	3	2	15 minutes
Replace Expression Lambda with Method Reference	68	37	2 hours, 16 minutes
Replace For-Loop with Enhanced-For-Loop	3	3	15 minutes
Replace For-Loop with Iterable::forEach	96	54	24 hours
Replace For-Loop with Stream::findFirst	2	2	4 minutes
Replace For-Loop with Stream::Match	5	4	10 minutes
Replace Inefficient Constructors with valueOf()	1	1	5 minutes
Reuse Random Objects	19	7	1 hour, 35 minutes
Split Multiple Variable Declarations	12	9	24 minutes
StringBuffer() to StringBuilder()	2	2	4 minutes
Use @Override Annotation	611	123	50 hours, 55 minutes
Use Arrays Stream	1	1	5 minutes
Use Collections Singleton List	15	6	30 minutes
Use equals() on Primitive Objects	3	2	6 minutes
Use Functional Interfaces	21	5	1 hour, 45 minutes
Use Guard Condition	90	60	7 hours, 30 minutes
Use Portable Newline	2	1	2 minutes
Use Predefined Standard Charset	1	1	2 minutes
Use SecureRandom	19	12	1 hour, 35 minutes
Use Stream::filter	9	8	45 minutes
Use Stream::map	4	4	1 hour
Use String Join	1	1	5 minutes
Use StringBuilder::append	513	142	17 hours, 6 minutes

* One Java file could contain more than one Java class.

---

jSparrow results for biojava

Metrics for biojava (created on 25.2.2021):

Total Java file* count	1321
Number of files changed	1114
Total number of issues fixed	25981
Total time saved	1940 hours, 42 minutes
jSparrow run time	1 minute, 32 seconds

* One Java file could contain more than one Java class.

Per Rule Statistics

This table contains the list of rules that were applied on biojava.

arrow_upwardRule Name	arrow_upwardIssues Fixed	arrow_upwardFiles Changed	arrow_upwardTime saved
Add Braces to Control Statements	2852	406	95 hours, 4 minutes
Avoid Concatenation in Logging Statements	313	77	26 hours, 5 minutes
Collapse If Statements	94	53	7 hours, 50 minutes
Create Temp Files Using Java NIO	27	12	2 hours, 15 minutes
Hide Default Constructor In Utility Classes	98	98	8 hours, 10 minutes
Insert Break Statements in For-loops	2	1	4 minutes
Make Fields And Variables Final	15731	940	1310 hours, 55 minutes
Remove Boxing for String Conversions	24	10	2 hours
Remove Collection::addAll	13	9	26 minutes
Remove Explicit Call To super()	71	69	1 hour, 11 minutes
Remove Explicit Type Argument	1601	414	26 hours, 41 minutes
Remove Inherited Interfaces from Class Declaration	4	4	8 minutes
Remove Lambda Expression Braces	416	181	34 hours, 40 minutes
Remove Modifiers in Interface Properties	561	78	9 hours, 21 minutes
Remove Redundant Type Casts	6	5	30 minutes
Remove Unnecessary Semicolons	17	13	17 minutes
Remove Unnecessary Thrown Exceptions on Method Signatures	85	30	2 hours, 50 minutes
Remove Unused Parameters in Private Methods	40	17	3 hours, 20 minutes
Reorder Modifiers	156	95	5 hours, 12 minutes
Reorder String Equality Check	632	121	105 hours, 20 minutes
Replace Assignment with Compound Operator	74	30	2 hours, 28 minutes
Replace Collection.sort with List.sort	21	18	42 minutes
Replace Concatenation with Infix-Operation	13	3	1 hour, 5 minutes
Replace Equality Check with isEmpty()	37	20	1 hour, 14 minutes
Replace equals() on Enum Constants	62	29	5 hours, 10 minutes
Replace Expression Lambda with Method Reference	160	97	5 hours, 20 minutes
Replace For-Loop with Enhanced-For-Loop	62	38	5 hours, 10 minutes
Replace For-Loop with Iterable::forEach	660	224	165 hours
Replace For-Loop with Stream::findFirst	31	20	1 hour, 2 minutes
Replace For-Loop with Stream::Match	29	21	58 minutes
Replace For-Loop with Stream::sum	1	1	10 minutes
Replace indexOf() with contains()	8	6	16 minutes
Replace Inefficient Constructors with valueOf()	134	20	11 hours, 10 minutes
Replace JUnit Expected Annotation Property with assertThrows	2	2	10 minutes
Replace Nested Loops with flatMap	6	6	1 hour, 30 minutes
Replace put(..) with putIfAbsent(..)	10	7	20 minutes
Replace static final Collections with Collections.unmodifiable...()	4	2	40 minutes
Replace While-Loop with Enhanced For-Loop	11	6	55 minutes
Reuse Random Objects	2	2	10 minutes
Split Multiple Variable Declarations	266	104	8 hours, 52 minutes
StringBuffer() to StringBuilder()	57	40	1 hour, 54 minutes
Use @Override Annotation	1	1	5 minutes
Use BufferedReader::lines	17	12	1 hour, 25 minutes
Use Collections Singleton List	14	10	28 minutes
Use Comparator Methods	1	1	5 minutes
Use equals() on Primitive Objects	14	10	28 minutes
Use Files.newBufferedReader	5	5	25 minutes
Use Files.newBufferedWriter	1	1	5 minutes
Use Functional Interfaces	61	28	5 hours, 5 minutes
Use Guard Condition	141	98	11 hours, 45 minutes
Use Multi Catch	27	23	2 hours, 15 minutes
Use Offset Based String Methods	1	1	5 minutes
Use Portable Newline	28	15	28 minutes
Use Predefined Standard Charset	1	1	2 minutes
Use SecureRandom	4	4	20 minutes
Use Stream::collect	13	11	3 hours, 15 minutes
Use Stream::filter	70	38	5 hours, 50 minutes
Use Stream::map	51	41	12 hours, 45 minutes
Use String Literals	5	3	25 minutes
Use StringBuilder::append	1128	381	37 hours, 36 minutes
Use Try-With-Resource	5	5	1 hour, 15 minutes

* One Java file could contain more than one Java class.

---

jSparrow results for dbeaver

Metrics for dbeaver (created on 16.2.2021):

Total Java file* count	4053
Number of files changed	2601
Total number of issues fixed	28463
Total time saved	2329 hours, 49 minutes
jSparrow run time	3 minutes, 55 seconds

* One Java file could contain more than one Java class.

Per Rule Statistics

This table contains the list of rules that were applied on dbeaver.

arrow_upwardRule Name	arrow_upwardIssues Fixed	arrow_upwardFiles Changed	arrow_upwardTime saved
Add Braces to Control Statements	1293	273	43 hours, 6 minutes
Collapse If Statements	304	211	25 hours, 20 minutes
Create Temp Files Using Java NIO	3	3	15 minutes
Hide Default Constructor In Utility Classes	173	173	14 hours, 25 minutes
Insert Break Statements in For-loops	1	1	2 minutes
Make Fields And Variables Final	19685	2325	1640 hours, 25 minutes
Remove Boxing for String Conversions	1	1	5 minutes
Remove Collection::addAll	12	12	24 minutes
Remove Explicit Call To super()	107	106	1 hour, 47 minutes
Remove Explicit Type Argument	43	32	43 minutes
Remove Inherited Interfaces from Class Declaration	83	61	2 hours, 46 minutes
Remove Lambda Expression Braces	656	350	54 hours, 40 minutes
Remove Modifiers in Interface Properties	26	5	26 minutes
Remove Null-Checks Before Instanceof	7	7	35 minutes
Remove Redundant Type Casts	18	18	1 hour, 30 minutes
Remove toString() on String	8	6	16 minutes
Remove Unnecessary Semicolons	9	8	9 minutes
Remove Unnecessary Thrown Exceptions on Method Signatures	52	34	1 hour, 44 minutes
Remove Unused Parameters in Private Methods	49	39	4 hours, 5 minutes
Reorder Modifiers	188	124	6 hours, 16 minutes
Reorder String Equality Check	108	62	18 hours
Replace Assignment with Compound Operator	20	11	40 minutes
Replace Collection.sort with List.sort	4	4	8 minutes
Replace Equality Check with isEmpty()	28	19	56 minutes
Replace equals() on Enum Constants	19	8	1 hour, 35 minutes
Replace Expression Lambda with Method Reference	213	138	7 hours, 6 minutes
Replace For-Loop with Enhanced-For-Loop	56	39	4 hours, 40 minutes
Replace For-Loop with Iterable::forEach	900	422	225 hours
Replace For-Loop with Stream::findFirst	88	63	2 hours, 56 minutes
Replace For-Loop with Stream::Match	42	36	1 hour, 24 minutes
Replace indexOf() with contains()	2	2	4 minutes
Replace put(..) with putIfAbsent(..)	3	2	6 minutes
Replace static final Collections with Collections.unmodifiable...()	9	6	1 hour, 30 minutes
Replace While-Loop with Enhanced For-Loop	1	1	5 minutes
Split Multiple Variable Declarations	141	96	4 hours, 42 minutes
StringBuffer() to StringBuilder()	2	2	4 minutes
Use @Override Annotation	756	384	63 hours
Use Arrays Stream	1	1	5 minutes
Use Collections Singleton List	4	4	8 minutes
Use equals() on Primitive Objects	4	3	8 minutes
Use Functional Interfaces	99	71	8 hours, 15 minutes
Use Guard Condition	853	499	71 hours, 5 minutes
Use Multi Catch	4	4	20 minutes
Use Offset Based String Methods	2	1	10 minutes
Use Portable Newline	1	1	1 minute
Use Predefined Standard Charset	1	1	2 minutes
Use SecureRandom	3	2	15 minutes
Use Stream::collect	64	51	16 hours
Use Stream::filter	221	147	18 hours, 25 minutes
Use Stream::map	63	53	15 hours, 45 minutes
Use String Join	1	1	5 minutes
Use StringBuilder::append	2030	840	67 hours, 40 minutes
Use Try-With-Resource	2	1	30 minutes

* One Java file could contain more than one Java class.

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jSparrow results for hudi

Metrics for hudi (created on 23.2.2021):

Total Java file* count	974
Number of files changed	591
Total number of issues fixed	7278
Total time saved	592 hours, 32 minutes
jSparrow run time	39 seconds

* One Java file could contain more than one Java class.

Per Rule Statistics

This table contains the list of rules that were applied on hudi.

arrow_upwardRule Name	arrow_upwardIssues Fixed	arrow_upwardFiles Changed	arrow_upwardTime saved
Avoid Concatenation in Logging Statements	12	8	1 hour
Collapse If Statements	7	5	35 minutes
Hide Default Constructor In Utility Classes	72	72	6 hours
Make Fields And Variables Final	5736	527	478 hours
Remove Collection::addAll	5	4	10 minutes
Remove Explicit Call To super()	13	12	13 minutes
Remove Explicit Type Argument	14	14	14 minutes
Remove Inherited Interfaces from Class Declaration	4	4	8 minutes
Remove Lambda Expression Braces	192	75	16 hours
Remove Modifiers in Interface Properties	11	5	11 minutes
Remove Redundant Type Casts	13	8	1 hour, 5 minutes
Remove toString() on String	2	2	4 minutes
Remove Unnecessary Thrown Exceptions on Method Signatures	28	18	56 minutes
Remove Unused Parameters in Private Methods	6	4	30 minutes
Reorder String Equality Check	49	19	8 hours, 10 minutes
Replace Assignment with Compound Operator	3	2	6 minutes
Replace Collection.sort with List.sort	4	3	8 minutes
Replace Equality Check with isEmpty()	3	3	6 minutes
Replace equals() on Enum Constants	23	9	1 hour, 55 minutes
Replace Expression Lambda with Method Reference	84	39	2 hours, 48 minutes
Replace For-Loop with Enhanced-For-Loop	6	5	30 minutes
Replace For-Loop with Iterable::forEach	126	56	31 hours, 30 minutes
Replace For-Loop with Stream::findFirst	1	1	2 minutes
Replace For-Loop with Stream::Match	3	3	6 minutes
Replace Inefficient Constructors with valueOf()	8	3	40 minutes
Replace put(..) with putIfAbsent(..)	16	13	32 minutes
Replace While-Loop with Enhanced For-Loop	3	3	15 minutes
Reuse Random Objects	3	3	15 minutes
StringBuffer() to StringBuilder()	3	1	6 minutes
Use @Override Annotation	67	33	5 hours, 35 minutes
Use Arrays Stream	5	4	25 minutes
Use BufferedReader::lines	1	1	5 minutes
Use Collections Singleton List	28	14	56 minutes
Use Comparator Methods	1	1	5 minutes
Use equals() on Primitive Objects	7	4	14 minutes
Use Guard Condition	86	54	7 hours, 10 minutes
Use Portable Newline	10	3	10 minutes
Use SecureRandom	13	13	1 hour, 5 minutes
Use Stream::collect	3	3	45 minutes
Use Stream::filter	17	16	1 hour, 25 minutes
Use Stream::map	11	10	2 hours, 45 minutes
Use String Join	2	2	10 minutes
Use StringBuilder::append	576	194	19 hours, 12 minutes
Use Try-With-Resource	1	1	15 minutes

* One Java file could contain more than one Java class.

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