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[BAEL-4495] - Add test for case when 2nd collection is also hashset (#10175)

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* [BAEL-4495] Performance of removeAll() in a HashSet

* [BAEL-4495] Add unit test for hashset removeAll()

* [BAEL-4495] Update test methods to camelCase

* [BAEL-4495] Add test for case when 2nd collection is also hashset
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AmitB 2020-10-18 21:29:00 +05:30 committed by GitHub
parent 44265c62c9
commit 000275f9f7
1 changed files with 17 additions and 0 deletions
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17
core-java-modules/core-java-collections-3/src/main/java/com/baeldung/collections/removeallperformance/HashSetBenchmark.java
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@ -33,11 +33,15 @@ public class HashSetBenchmark {
private List<Employee> employeeList1 = new ArrayList<>(); private List<Employee> employeeList1 = new ArrayList<>();
private Set<Employee> employeeSet2 = new HashSet<>(); private Set<Employee> employeeSet2 = new HashSet<>();
private List<Employee> employeeList2 = new ArrayList<>(); private List<Employee> employeeList2 = new ArrayList<>();
private Set<Employee> employeeSet3 = new HashSet<>();
private Set<Employee> employeeSet4 = new HashSet<>();
private long set1Size = 60000; private long set1Size = 60000;
private long list1Size = 50000; private long list1Size = 50000;
private long set2Size = 50000; private long set2Size = 50000;
private long list2Size = 60000; private long list2Size = 60000;
private long set3Size = 50000;
private long set4Size = 60000;
@Setup(Level.Trial) @Setup(Level.Trial)
public void setUp() { public void setUp() {
@ -57,6 +61,14 @@ public class HashSetBenchmark {
for (long i = 0; i < list2Size; i++) { for (long i = 0; i < list2Size; i++) {
employeeList2.add(new Employee(i, RandomStringUtils.random(7, true, false))); employeeList2.add(new Employee(i, RandomStringUtils.random(7, true, false)));
} }
for (long i = 0; i < set3Size; i++) {
employeeSet3.add(new Employee(i, RandomStringUtils.random(7, true, false)));
}
for (long i = 0; i < set4Size; i++) {
employeeSet4.add(new Employee(i, RandomStringUtils.random(7, true, false)));
}
} }
@ -71,6 +83,11 @@ public class HashSetBenchmark {
public boolean given_SizeOfHashsetSmallerThanSizeOfCollection_When_RemoveAllFromHashSet_Then_BadPerformance(MyState state) { public boolean given_SizeOfHashsetSmallerThanSizeOfCollection_When_RemoveAllFromHashSet_Then_BadPerformance(MyState state) {
return state.employeeSet2.removeAll(state.employeeList2); return state.employeeSet2.removeAll(state.employeeList2);
} }
@Benchmark
public boolean given_SizeOfHashsetSmallerThanSizeOfAnotherHashSet_When_RemoveAllFromHashSet_Then_GoodPerformance(MyState state) {
return state.employeeSet3.removeAll(state.employeeSet4);
}
public static void main(String[] args) throws Exception { public static void main(String[] args) throws Exception {
Options options = new OptionsBuilder().include(HashSetBenchmark.class.getSimpleName()) Options options = new OptionsBuilder().include(HashSetBenchmark.class.getSimpleName())