Statistics Summary

For our testing we measured open source projects on GitHub.

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

Summary of Statistics

This is a summary of the statistics of all open source projects listed on the Statistics of Open Source Projects 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.

Cleanup code with plugin

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Combined Statistics

This table adds up all the numbers seen on the Statistics of Open Source Projects page for each project.

arrow_upwardRule Name	arrow_upwardIssues Fixed	arrow_upwardFiles Changed	arrow_upwardTime saved
Add Braces to Control Statements	18988	1979	4430 hours, 32 minutes
Avoid Concatenation in Logging Statements	330	89	110 hours
Collapse If Statements	758	513	631 hours, 40 minutes
Create Temp Files Using Java NIO	56	37	23 hours, 20 minutes
Hide Default Constructor In Utility Classes	678	678	565 hours
Insert Break Statements in For-loops	5	3	30 minutes
Make Fields And Variables Final	129753	10783	108127 hours, 30 minutes
Remove Boxing for String Conversions	90	56	60 hours
Remove Collection::addAll	103	71	34 hours, 20 minutes
Remove Explicit Call To super()	290	274	43 hours, 30 minutes
Remove Explicit Type Argument	3815	1044	572 hours, 15 minutes
Remove Inherited Interfaces from Class Declaration	135	106	36 hours
Remove Lambda Expression Braces	4342	1452	3618 hours, 20 minutes
Remove Modifiers in Interface Properties	1228	131	102 hours, 20 minutes
Remove Null-Checks Before Instanceof	72	46	24 hours
Remove Redundant Type Casts	217	131	144 hours, 40 minutes
Remove toString() on String	19	16	3 hours, 10 minutes
Remove Unnecessary Semicolons	332	38	27 hours, 40 minutes
Remove Unnecessary Thrown Exceptions on Method Signatures	1225	561	408 hours, 20 minutes
Remove Unused Parameters in Private Methods	274	143	228 hours, 20 minutes
Reorder Modifiers	662	349	132 hours, 24 minutes
Reorder String Equality Check	1496	453	2493 hours, 20 minutes
Replace Assignment with Compound Operator	134	71	35 hours, 44 minutes
Replace Collection.sort with List.sort	40	33	8 hours
Replace Concatenation with Infix-Operation	13	3	1 hour, 5 minutes
Replace Equality Check with isEmpty()	198	124	52 hours, 48 minutes
Replace equals() on Enum Constants	280	106	210 hours
Replace Expression Lambda with Method Reference	1177	671	392 hours, 20 minutes
Replace For-Loop with Enhanced-For-Loop	175	127	102 hours, 5 minutes
Replace For-Loop with Iterable::forEach	3842	1670	9605 hours
Replace For-Loop with Stream::findFirst	196	133	58 hours, 48 minutes
Replace For-Loop with Stream::Match	196	130	65 hours, 20 minutes
Replace For-Loop with Stream::sum	1	1	10 minutes
Replace indexOf() with contains()	18	13	2 hours, 24 minutes
Replace Inefficient Constructors with valueOf()	250	45	104 hours, 10 minutes
Replace JUnit Expected Annotation Property with assertThrows	2	2	10 minutes
Replace JUnit Timeout Annotation Property with assertTimeout	3	1	15 minutes
Replace Map::get by Map::getOrDefault	1	1	2 minutes
Replace Nested Loops with flatMap	8	8	4 hours
Replace put(..) with putIfAbsent(..)	49	38	13 hours, 4 minutes
Replace static final Collections with Collections.unmodifiable...()	29	22	29 hours
Replace While-Loop with Enhanced For-Loop	68	26	45 hours, 20 minutes
Reuse Random Objects	91	44	53 hours, 5 minutes
Split Multiple Variable Declarations	558	279	148 hours, 48 minutes
StringBuffer() to StringBuilder()	84	61	16 hours, 48 minutes
Use @Override Annotation	5400	1505	4050 hours
Use Arrays Stream	7	6	1 hour, 45 minutes
Use BufferedReader::lines	22	17	9 hours, 10 minutes
Use Collections Singleton List	195	78	52 hours
Use Comparator Methods	3	3	45 minutes
Use equals() on Primitive Objects	42	30	11 hours, 12 minutes
Use Factory Methods for Collections	16	7	2 hours, 40 minutes
Use Files.newBufferedReader	5	5	25 minutes
Use Files.newBufferedWriter	1	1	5 minutes
Use Files.writeString	1	1	5 minutes
Use Functional Interfaces	474	265	276 hours, 30 minutes
Use Guard Condition	2589	1667	2157 hours, 30 minutes
Use Local Variable Type Inference	35676	3122	2378 hours, 24 minutes
Use Multi Catch	166	52	83 hours
Use Offset Based String Methods	3	2	30 minutes
Use Optional::filter	1	1	2 minutes
Use Optional::ifPresent	4	4	16 minutes
Use Optional::map	3	3	6 minutes
Use Portable Newline	66	33	8 hours, 48 minutes
Use Predefined Standard Charset	20	14	3 hours, 20 minutes
Use SecureRandom	239	119	199 hours, 10 minutes
Use Stream::collect	120	92	180 hours
Use Stream::filter	542	359	451 hours, 40 minutes
Use Stream::map	246	201	615 hours
Use String Join	9	8	4 hours, 30 minutes
Use String Literals	14	8	4 hours, 40 minutes
Use StringBuilder::append	10432	3727	3477 hours, 20 minutes
Use Try-With-Resource	39	21	58 hours, 30 minutes

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