From eab67c04b5bb0357b587eb1c34033253203ff269 Mon Sep 17 00:00:00 2001
From: akeshri <ashwini.nitdgp@gmail.com>
Date: Sat, 29 Aug 2020 21:02:52 +0530
Subject: [PATCH] changes

---
 .../com/baeldung/article/HashMapExample.java  | 36 ++++++++++++++++++
 .../article/LinkedHashMapExample.java         | 37 +++++++++++++++++++
 2 files changed, 73 insertions(+)
 create mode 100644 MapFirstKeyExample/src/com/baeldung/article/HashMapExample.java
 create mode 100644 MapFirstKeyExample/src/com/baeldung/article/LinkedHashMapExample.java

diff --git a/MapFirstKeyExample/src/com/baeldung/article/HashMapExample.java b/MapFirstKeyExample/src/com/baeldung/article/HashMapExample.java
new file mode 100644
index 0000000000..3292d995ab
--- /dev/null
+++ b/MapFirstKeyExample/src/com/baeldung/article/HashMapExample.java
@@ -0,0 +1,36 @@
+package com.baeldung.article;
+
+import java.util.AbstractMap;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * @author AshwiniKeshri
+ *
+ */
+public class HashMapExample {
+    public static void main(String[] args) {
+
+        Map<Integer, String> hashmap = new HashMap<>();
+        hashmap.put(5, "A");
+        hashmap.put(1, "B");
+        hashmap.put(2, "C");
+        // hashmap.put(0, "D");
+
+        System.out.println(hashmap);
+
+        Set<Map.Entry<Integer, String>> entrySet = hashmap.entrySet();
+
+        Iterator<Map.Entry<Integer, String>> iterator = entrySet.iterator();
+
+        if (iterator.hasNext())
+            System.out.println("Using Iteraor: " + iterator.next());
+
+        System.out.println("Using Stream: " + entrySet.stream()
+            .findFirst()
+            .orElse(new AbstractMap.SimpleEntry<Integer, String>(-1, "DEFAULT")));
+
+    }
+}
diff --git a/MapFirstKeyExample/src/com/baeldung/article/LinkedHashMapExample.java b/MapFirstKeyExample/src/com/baeldung/article/LinkedHashMapExample.java
new file mode 100644
index 0000000000..249b9a0585
--- /dev/null
+++ b/MapFirstKeyExample/src/com/baeldung/article/LinkedHashMapExample.java
@@ -0,0 +1,37 @@
+package com.baeldung.article;
+
+import java.util.AbstractMap;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * @author AshwiniKeshri
+ *
+ */
+public class LinkedHashMapExample {
+
+    public static void main(String[] args) {
+
+        LinkedHashMap<Integer, String> linkedHashMap = new LinkedHashMap<>();
+        linkedHashMap.put(5, "A");
+        linkedHashMap.put(1, "B");
+        linkedHashMap.put(2, "C");
+        // linkedHashMap.put(0, "D");
+
+        System.out.println(linkedHashMap);
+
+        Set<Map.Entry<Integer, String>> entrySet = linkedHashMap.entrySet();
+
+        Iterator<Map.Entry<Integer, String>> iterator = entrySet.iterator();
+
+        if (iterator.hasNext())
+            System.out.println("Using Iterator: " + iterator.next());
+
+        System.out.println("Using Stream: " + entrySet.stream()
+            .findFirst()
+            .orElse(new AbstractMap.SimpleEntry<Integer, String>(0, "DEFAULT")));
+    }
+
+}