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LinkedHashMap
Last Updated : 26 May, 2026
title: LinkedHashMap in Java
Collections Framework34 words3 headingsExamples included
title: LinkedHashMap in Java description: LinkedHashMap - insertion order maintain karna
HashMap + insertion order maintain. Internally doubly linked list + hash table.
Create karna
java exampleWoHoTech
LinkedHashMap<String, Integer> lhm = new LinkedHashMap<>();
// Access order (LRU Cache ke liye)
LinkedHashMap<String, Integer> lru = new LinkedHashMap<>(16, 0.75f, true);Operations (HashMap jaisi, lekin order maintain)
java exampleWoHoTech
LinkedHashMap<String, Integer> lhm = new LinkedHashMap<>();
lhm.put("C", 3);
lhm.put("A", 1);
lhm.put("B", 2);
// Insertion order maintain
for (Map.Entry<String, Integer> e : lhm.entrySet())
System.out.println(e.getKey() + "=" + e.getValue());
// C=3, A=1, B=2LRU Cache Implementation
java exampleWoHoTech
class LRUCache<K, V> extends LinkedHashMap<K, V> {
private int capacity;
LRUCache(int capacity) {
super(capacity, 0.75f, true); // accessOrder = true
this.capacity = capacity;
}
@Override
protected boolean removeEldestEntry(Map.Entry<K, V> eldest) {
return size() > capacity;
}
}
LRUCache<Integer, String> cache = new LRUCache<>(3);
cache.put(1, "One");
cache.put(2, "Two");
cache.put(3, "Three");
cache.get(1); // Access 1 (becomes most recently used)
cache.put(4, "Four"); // 2 removed (least recently used)Exam Focus
Revise definitions, diagrams, examples, and short-answer points for LinkedHashMap.
Interview Use
Prepare one clear explanation, one practical example, and one common mistake for this Java topic.
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