Added Collection vs Stream

spdpiyush · spdpiyush · commit 0b04d65073dc · 2025-02-25T14:45:28.000+05:30
diff --git a/Modern-Java-Examples/src/com/learn/streams/CollectionVsStream.java b/Modern-Java-Examples/src/com/learn/streams/CollectionVsStream.java
@@ -0,0 +1,51 @@
+package com.learn.streams;
+
+import java.util.ArrayList;
+import java.util.stream.Stream;
+
+public class CollectionVsStream {
+
+    public static void main(String[] args) {
+
+        /**
+         * <p>
+         *     In Collection, we can add, remove or modify the Values.
+         * </p>
+         */
+        ArrayList<String> names = new ArrayList<>();
+        names.add("adam");
+        names.add("jim");
+        names.add("jenny");
+
+        names.remove(0);
+        System.out.println(names);
+
+        /**
+         * <p>
+         *     But Stream, doesn't allow us to add, modify or delete elements once it is created.
+         * </p>
+         */
+
+        /**
+         * <p>
+         *     Collections can be traversed "n" times.
+         * </p>
+         */
+        for (String name : names) {
+            System.out.println(name);
+        }
+
+        for (String name : names) {
+            System.out.println(name);
+        }
+
+        /**
+         * Streams can be traversed only once
+         */
+        Stream<String> namesStream = names.stream();
+
+        namesStream.forEach(System.out::println);
+        namesStream.forEach(System.out::println); // it throws an Exception. stream has already been operated upon or closed.
+
+    }
+}
diff --git a/README.md b/README.md
@@ -23,6 +23,7 @@ This repository contains the basic &amp; advance level examples related to Java
   * [Lambdas and Local Variables](Modern-Java-Examples/src/com/learn/lambdas/LambdaVariable1.java)
   * [Streams](Modern-Java-Examples/src/com/learn/streams)
     * [Stream Example](Modern-Java-Examples/src/com/learn/streams/StreamsExample.java)
+    * [Collection vs Stream](Modern-Java-Examples/src/com/learn/streams/CollectionVsStream.java)
 
 
 
