http://jira.baeldung.com/browse/BAEL-3707 (#8535)

Missing Code - Guide To Java 8 Optional

core-java-modules/core-java-optional/src/main/java/com/baeldung/optional/Person.java

@@ -1,6 +1,8 @@
 package com.baeldung.optional;
 
+import java.util.List;
 import java.util.Optional;
+import java.util.stream.Collectors;
 
 public class Person {
     private String name;
@@ -21,7 +23,7 @@ public class Person {
     }
 
     public Optional<Integer> getAge() {
-        return Optional.ofNullable(age);
+        return Optional.of(age);
     }
 
     public void setAge(int age) {
@@ -36,4 +38,37 @@ public class Person {
         return Optional.ofNullable(password);
     }
 
+    public static List<Person> search(List<Person> people, String name, Optional<Integer> age) {
+        // Null checks for people and name
+        return people.stream()
+                .filter(p -> p.getName().equals(name))
+                .filter(p -> p.getAge().get() >= age.orElse(0))
+                .collect(Collectors.toList());
+    }
+
+    public static List<Person> search(List<Person> people, String name, Integer age) {
+        // Null checks for people and name
+        final Integer ageFilter = age != null ? age : 0;
+
+        return people.stream()
+                .filter(p -> p.getName().equals(name))
+                .filter(p -> p.getAge().get() >= ageFilter)
+                .collect(Collectors.toList());
+    }
+
+    public static List<Person> search(List<Person> people, String name) {
+        return doSearch(people, name, 0);
+    }
+
+    public static List<Person> search(List<Person> people, String name, int age) {
+        return doSearch(people, name, age);
+    }
+
+    private static List<Person> doSearch(List<Person> people, String name, int age) {
+        // Null checks for people and name
+        return people.stream()
+                .filter(p -> p.getName().equals(name))
+                .filter(p -> p.getAge().get().intValue() >= age)
+                .collect(Collectors.toList());
+    }
 }