Java Program to Sort map by keys

To understand this example, you should have the knowledge of the following Java programming topics:

Example: Sort a map by keys using TreeMap

Output

Map: {pos1=Java, pos2=Python, pos3=JS}
Map with sorted Key{pos1=Java, pos2=Python, pos3=JS}

In the above example, we have created a map named languages using HashMap. Here, the map is not sorted.

To sort the map, we created a treemap from the map. Now, the map is sorted by its keys.

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Update value of HashMap using key

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Convert the ArrayList into a string and vice versa