How can a hashmap be sorted?

HashMap is a collection that is unordered and does not support sorting, however it is possible to sort by the keys or values of the HashMap.

1. Sort by key:
2. Convert the key set of a HashMap to a List, and sort the List using the Collections.sort() method.
3. Create a HashMap with key-value pairs, add entries to the map, sort the keys, iterate through the sorted keys to access and print out the corresponding values.
4. Sort by value.
5. Convert the key-value pairs of a HashMap into a List, then sort the List using the Collections.sort() method based on the values’ size.
6. Initialize a HashMap with key as String and value as Integer. Add key-value pairs to the map. Copy the entries of the map to a list and sort the list based on the values in ascending order. Iterate through the sorted key-value pairs and access the key and value to print them out.

Please note that the above sorting method can only be applied to HashMaps with keys or values that are primitive types. If the HashMap contains custom objects as keys or values, a custom comparator will be needed to achieve sorting.