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BAEL-2448-Rev1 

Changing examples to unit tests instead of plain methods after advice from editor.
This commit is contained in:
Rodolfo Felipe 2019-03-04 20:43:14 -04:00
parent 7e2de11a5a
commit 3186e48403
2 changed files with 73 additions and 51 deletions
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51
core-java-collections-list/src/main/java/com/baeldung/collection/filtering/CollectionFilteringExamples.java
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@ -1,51 +0,0 @@
package com.baeldung.collection.filtering;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
/**
* Various filtering examples.
*
* @author Rodolfo Felipe
*/
public class CollectionFilteringExamples {
private List<Employee> buildEmployeeList() {
return Arrays.asList(new Employee(1, "Mike", 1), new Employee(2, "John", 1), new Employee(3, "Mary", 1), new Employee(4, "Joe", 2), new Employee(5, "Nicole", 2), new Employee(6, "Alice", 2), new Employee(7, "Bob", 3), new Employee(8, "Scarlett", 3));
}
private List<String> employeeNameFilter() {
return Arrays.asList("Alice", "Mike", "Bob");
}
private List<Employee> getFilteredEmployeeList() {
List<Employee> filteredList = new ArrayList<>();
for (Employee employee : buildEmployeeList()) {
for (String name : employeeNameFilter()) {
if (employee.getName()
.equalsIgnoreCase(name)) {
filteredList.add(employee);
}
}
}
return filteredList;
}
private List<Employee> getFilteredEmployeeListLambdaExample() {
return buildEmployeeList().stream()
.filter(employee -> employeeNameFilter().contains(employee.getName()))
.collect(Collectors.toList());
}
private List<Employee> getFilteredEmployeeListLambdaExampleWithHashSetContains() {
Set<String> nameFilterSet = employeeNameFilter().stream()
.collect(Collectors.toSet());
return buildEmployeeList().stream()
.filter(employee -> nameFilterSet.contains(employee.getName()))
.collect(Collectors.toList());
}
}

73
core-java-collections-list/src/test/java/com/baeldung/collection/filtering/CollectionFilteringTest.java Normal file
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@ -0,0 +1,73 @@
package com.baeldung.collection.filtering;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import org.hamcrest.Matchers;
import org.junit.Assert;
import org.junit.Test;
/**
* Various filtering examples.
*
* @author Rodolfo Felipe
*/
public class CollectionFilteringTest {
private List<Employee> buildEmployeeList() {
return Arrays.asList(new Employee(1, "Mike", 1), new Employee(2, "John", 1), new Employee(3, "Mary", 1), new Employee(4, "Joe", 2), new Employee(5, "Nicole", 2), new Employee(6, "Alice", 2), new Employee(7, "Bob", 3), new Employee(8, "Scarlett", 3));
}
private List<String> employeeNameFilter() {
return Arrays.asList("Alice", "Mike", "Bob");
}
@Test
public void givenEmployeeList_andNameFilterList_thenObtainFilteredEmployeeList_usingForEachLoop() {
List<Employee> filteredList = new ArrayList<>();
List<Employee> originalList = buildEmployeeList();
List<String> nameFilter = employeeNameFilter();
for (Employee employee : originalList) {
for (String name : nameFilter) {
if (employee.getName()
.equalsIgnoreCase(name)) {
filteredList.add(employee);
}
}
}
Assert.assertThat(filteredList.size(), Matchers.is(nameFilter.size()));
}
@Test
public void givenEmployeeList_andNameFilterList_thenObtainFilteredEmployeeList_usingLambda() {
List<Employee> filteredList;
List<Employee> originalList = buildEmployeeList();
List<String> nameFilter = employeeNameFilter();
filteredList = originalList.stream()
.filter(employee -> nameFilter.contains(employee.getName()))
.collect(Collectors.toList());
Assert.assertThat(filteredList.size(), Matchers.is(nameFilter.size()));
}
@Test
public void givenEmployeeList_andNameFilterList_thenObtainFilteredEmployeeList_usingLambdaAndHashSet() {
List<Employee> filteredList;
List<Employee> originalList = buildEmployeeList();
Set<String> nameFilterSet = employeeNameFilter().stream()
.collect(Collectors.toSet());
filteredList = originalList.stream()
.filter(employee -> nameFilterSet.contains(employee.getName()))
.collect(Collectors.toList());
Assert.assertThat(filteredList.size(), Matchers.is(nameFilterSet.size()));
}
}