keySet() method is available in java.util package. keySet()方法在java.util包中可用。 keySet() method is used to get all the existing keys in this LinkedHashMap to be viewed in a Set.

// get(K) --> Returns the value to which the specified key is mapped,or null if this map contains no mapping for the key. // We can use for each loop to iterate through the keys. // iteration through ...

> 原文:[https://www . geesforgeks . org/convert-ArrayList-to-linked hashmap-in-Java/](https://www.geeksforgeeks.org/convert-arraylist-to-linkedhashmap-in-java ...