> 原文:[https://www . geesforgeks . org/check-if-special-key-exists-in-Java-hashmap/](https://www.geeksforgeeks.org/check-if-particular-key-exists-in-java-hashmap ...

You are given an array arr[] of strings. Your task is to group the anagrams together and return all such groups. The groups must be created in order of their ...