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In Java, the LinkedHashMap class is a powerful data structure that combines the unique key-value mapping of a HashMap with the predictable iteration order of a LinkedList. This makes it an excellent choice for scenarios where the order of insertion matters, such as maintaining a cache with a defined access order. However, LinkedHashMap does not provide a direct way to access values by index, as it is fundamentally a map rather than a list. Despite this, there are several approaches to retrieve a value by its position in the map. This article explores these methods, providing practical examples and discussing the trade-offs of each approach.<\/p>\n
LinkedHashMap is a Java predefined class that is similar to HashMap, which contains keys and their respective values. The order of insertion in LinkedHashMap is preserved. <\/p>\n
Our objective here is to get a value from the LinkedHashMap by index. We can use many approaches to solve this problem. Let us have a look at the different approaches.<\/p>\n
In this approach, we will convert all the LinkedHashMap keys to a set with the help of keySet() function and then will convert this newly created set to an array with the help of the toArray() function. <\/p>\n
As of now, we have an array; we can get a value by index.<\/p>\n
Syntax:<\/strong> Object [ ] toArray ( ) <\/p>\n Parameters:<\/strong> This function does not take any parameters.<\/p>\n Return Value:<\/strong> The function returns a new array that contains the elements of the set.<\/p>\n [ [1,2] , [3,4] , [5,6] ], Index of the element to be fetched – 2<\/p>\n Value at index 2 is 4<\/p>\n Explanation:<\/strong> As we can see, at the 2nd<\/sup> index, the key-value pair is [ 3, 4 ], so our output will be 4, the value at the 2nd<\/sup> index.<\/p>\nInput<\/h5>\n
Output<\/h5>\n
Code Implementation on how to get value from linkedhashmap in java
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