LinkedHashSet

title: LinkedHashSet in Java description: LinkedHashSet - insertion order maintain karna

HashSet + insertion order maintain karna. Internally LinkedHashMap use karta hai.

Create karna

java exampleWoHoTech

LinkedHashSet<String> lhs = new LinkedHashSet<>();

Operations (HashSet jaisi)

java exampleWoHoTech

LinkedHashSet<String> lhs = new LinkedHashSet<>();
lhs.add("Banana");
lhs.add("Apple");
lhs.add("Mango");
lhs.add("Apple"); // Duplicate — ignore

// Iteration — insertion order maintain hogi
for (String s : lhs) System.out.println(s);
// Output: Banana, Apple, Mango (insertion order)

HashSet vs LinkedHashSet vs TreeSet

	HashSet	LinkedHashSet	TreeSet
--	--	--	--
Order	No order	Insertion order	Sorted (natural)
Speed	Fastest	Medium	Slowest (O log n)
Null	1 allowed	1 allowed	Not allowed (except empty)
Underlying	HashMap	LinkedHashMap	TreeMap (Red-Black tree)

Use Case

Jab duplicate remove karna ho aur insertion order bhi chahiye.

List<String> names = Arrays.asList("Ram", "Shyam", "Ram", "Geeta", "Shyam"); Set<String> unique = new LinkedHashSet<>(names); System.out.println(unique); // [Ram, Shyam, Geeta]

title: LinkedHashSet in Java description: LinkedHashSet - insertion order maintain karna

HashSet + insertion order maintain karna. Internally LinkedHashMap use karta hai.

Create karna

java exampleWoHoTech

LinkedHashSet<String> lhs = new LinkedHashSet<>();

Operations (HashSet jaisi)

java exampleWoHoTech

LinkedHashSet<String> lhs = new LinkedHashSet<>();
lhs.add("Banana");
lhs.add("Apple");
lhs.add("Mango");
lhs.add("Apple"); // Duplicate — ignore

// Iteration — insertion order maintain hogi
for (String s : lhs) System.out.println(s);
// Output: Banana, Apple, Mango (insertion order)

HashSet vs LinkedHashSet vs TreeSet

	HashSet	LinkedHashSet	TreeSet
--	--	--	--
Order	No order	Insertion order	Sorted (natural)
Speed	Fastest	Medium	Slowest (O log n)
Null	1 allowed	1 allowed	Not allowed (except empty)
Underlying	HashMap	LinkedHashMap	TreeMap (Red-Black tree)

Use Case

Jab duplicate remove karna ho aur insertion order bhi chahiye.

List<String> names = Arrays.asList("Ram", "Shyam", "Ram", "Geeta", "Shyam"); Set<String> unique = new LinkedHashSet<>(names); System.out.println(unique); // [Ram, Shyam, Geeta]

LinkedHashSet

Create karna

Operations (HashSet jaisi)

HashSet vs LinkedHashSet vs TreeSet

Use Case

Continue learning this concept

LinkedHashSet

Create karna

Operations (HashSet jaisi)

HashSet vs LinkedHashSet vs TreeSet

Use Case

Continue learning this concept