Java LinkedHashMap class

Java LinkedHashMap class is Hashtable and Linked list implementation of the Map interface, with predictable iteration order. It inherits HashMap class and implements the Map interface.

Points to remember

• Java LinkedHashMap contains values based on the key.
• Java LinkedHashMap contains unique elements.
• Java LinkedHashMap may have one null key and multiple null values.
• Java LinkedHashMap is non synchronized.
• Java LinkedHashMap maintains insertion order.
• The initial default capacity of Java HashMap class is 16 with a load factor of 0.75.

LinkedHashMap class declaration

Let's see the declaration for java.util.LinkedHashMap class.

LinkedHashMap class Parameters

Let's see the Parameters for java.util.LinkedHashMap class.

• K: It is the type of keys maintained by this map.
• V: It is the type of mapped values.

Constructors of Java LinkedHashMap class

Methods of Java LinkedHashMap class

Java LinkedHashMap Example

Output:

100 Amit
       101 Vijay
       102 Rahul

Java LinkedHashMap Example: Key-Value pair

Output:

Keys: [100, 101, 102]
Values: [Amit, Vijay, Rahul]
Key-Value pairs: [100=Amit, 101=Vijay, 102=Rahul]

Java LinkedHashMap Example:remove()

Output:

Before invoking remove() method: {101=Amit, 102=Vijay, 103=Rahul}
After invoking remove() method: {101=Amit, 103=Rahul}

Java LinkedHashMap Example: Book

Output:

2 Details:
102 Data Communications & Networking Forouzan Mc Graw Hill 4
1 Details:
101 Let us C Yashwant Kanetkar BPB 8
3 Details:
103 Operating System Galvin Wiley 6