Create LinkedHashMapDemo.java

rahulXbarnwal · web-flow · commit b400734c9837 · 2026-03-15T01:52:59.000+05:30
diff --git a/src/learnCollections/LinkedHashMapDemo.java b/src/learnCollections/LinkedHashMapDemo.java
@@ -0,0 +1,37 @@
+package learnCollections;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public class LinkedHashMapDemo {
+    public static void main(String[] args) {
+        // uses double linked list to maintain insertion order
+        LinkedHashMap<String, Integer> linkedHashMap = new LinkedHashMap<>(11, 0.8f, true); // initial capacity = 11, load factor = 0.8, access order = true (maintains access order instead of insertion order, by default it's false)
+        linkedHashMap.put("Orange", 10);
+        linkedHashMap.put("Apple", 20);
+        linkedHashMap.put("Guava", 30);
+
+        linkedHashMap.get("Apple");
+
+        for (Map.Entry<String, Integer> entry: linkedHashMap.entrySet()) {
+            System.out.println(entry.getKey() + ": " + entry.getValue());
+        }
+        /*
+        Orange: 10
+        Guava: 30
+        Apple: 20
+         */
+
+
+        HashMap<String, Integer> hashMap = new HashMap<>();
+
+        hashMap.put("Shubham", 90);
+        hashMap.put("Bob", 80);
+        hashMap.put("Akshit", 78);
+
+        Integer res = hashMap.getOrDefault("Rahul", 0);
+        hashMap.putIfAbsent("Shubham", 92); // won't update because key already exists
+        System.out.println(hashMap);
+    }
+}
