From 7e2de11a5afaee971e4e54cf05540217263c1ff5 Mon Sep 17 00:00:00 2001
From: Rodolfo Felipe <rodolforfq@gmail.com>
Date: Mon, 4 Mar 2019 00:36:23 -0400
Subject: [PATCH] BAEL-2448

Code examples for article.
---
 .../CollectionFilteringExamples.java          | 51 +++++++++++++++++++
 .../collection/filtering/Employee.java        | 44 ++++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 core-java-collections-list/src/main/java/com/baeldung/collection/filtering/CollectionFilteringExamples.java
 create mode 100644 core-java-collections-list/src/main/java/com/baeldung/collection/filtering/Employee.java

diff --git a/core-java-collections-list/src/main/java/com/baeldung/collection/filtering/CollectionFilteringExamples.java b/core-java-collections-list/src/main/java/com/baeldung/collection/filtering/CollectionFilteringExamples.java
new file mode 100644
index 0000000000..a7ab5840f7
--- /dev/null
+++ b/core-java-collections-list/src/main/java/com/baeldung/collection/filtering/CollectionFilteringExamples.java
@@ -0,0 +1,51 @@
+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());
+    }
+
+}
diff --git a/core-java-collections-list/src/main/java/com/baeldung/collection/filtering/Employee.java b/core-java-collections-list/src/main/java/com/baeldung/collection/filtering/Employee.java
new file mode 100644
index 0000000000..2aa267b4dc
--- /dev/null
+++ b/core-java-collections-list/src/main/java/com/baeldung/collection/filtering/Employee.java
@@ -0,0 +1,44 @@
+package com.baeldung.collection.filtering;
+
+/**
+ * Java 8 Collection Filtering by List of Values base class.
+ *
+ * @author Rodolfo Felipe
+ */
+public class Employee {
+
+    private Integer employeeNumber;
+    private String name;
+    private Integer departmentId;
+
+    public Employee(Integer employeeNumber, String name, Integer departmentId) {
+        this.employeeNumber = employeeNumber;
+        this.name = name;
+        this.departmentId = departmentId;
+    }
+
+    public Integer getEmployeeNumber() {
+        return employeeNumber;
+    }
+
+    public void setEmployeeNumber(Integer employeeNumber) {
+        this.employeeNumber = employeeNumber;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Integer getDepartmentId() {
+        return departmentId;
+    }
+
+    public void setDepartmentId(Integer departmentId) {
+        this.departmentId = departmentId;
+    }
+
+}