Adding flatMap() Stream Operation

spdpiyush · spdpiyush · commit 49c0c426424e · 2025-02-26T13:33:08.000+05:30
diff --git a/Modern-Java-Examples/src/com/learn/streams/StreamsFlatMapExample.java b/Modern-Java-Examples/src/com/learn/streams/StreamsFlatMapExample.java
@@ -0,0 +1,30 @@
+package com.learn.streams;
+
+import com.learn.data.Student;
+import com.learn.data.StudentDataBase;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class StreamsFlatMapExample {
+
+    public static void main(String[] args) {
+        System.out.println(studentActivities());
+    }
+
+    /**
+     * <p>
+     *     we have to print all activities in a List.
+     *     Using flatMap to Flatten the Stream.
+     * </p>
+     * @return
+     */
+    public static List<String> studentActivities() {
+
+        return StudentDataBase.getAllStudents().stream()
+                .map(Student::getActivities)
+                .flatMap(List::stream)
+                .collect(Collectors.toList());
+
+    }
+}
diff --git a/README.md b/README.md
@@ -26,6 +26,7 @@ This repository contains the basic &amp; advance level examples related to Java
     * [Collection vs Stream](Modern-Java-Examples/src/com/learn/streams/CollectionVsStream.java)
   * [Streams API Operations]
     * [map()](Modern-Java-Examples/src/com/learn/streams/StreamsMapExample.java)
+    * [flatMap()](Modern-Java-Examples/src/com/learn/streams/StreamsFlatMapExample.java)
 
 
 
