How do I store multiple values in a HashMap?
HashMap can be used to store key-value pairs. But sometimes you may want to store multiple values for the same key… For example:
- For Key A, you want to store: Apple, Airplane.
- For Key B, you want to store: Bat, Banana.
- For Key C, you want to store: Cat, Car.
Table of Contents
Can we store different types of data together?
Yes, we can store different/mixed types in a single array using the following two methods: Method 1: Use the object array because all types in . net inherit from the object type Ex: object[] array=new object[2];array[0]=102;array[1]=”csharp”;Method 2: Alternatively, we can use the ArrayList class present in System.
Can we store multiple types of data in the list?
As we said, you can store a number, a string, and even another list within a single list. It’s okay to mix data types!
How to store multiple values in a hashmap?
“the” occurred at the following indices 1,4,8,12. To store this data in a lookup table/map we need to create a HashMap with the key as a string and then associate multiple values with the same key. We can do this by storing a list of integers, i.e. listing objects as values in the HashMap.
Are there different types of HashMap in Java?
You have some variables that are of different types in the Java language like so: if you use a HashMap like: public class YourDataClass { private String messageType; private timestamp timestamp; private internal account; private int version; // your get/setters ……….. }
How to store different types of data as values?
I need to create a hash map with the key as an integer and it must contain multiple values of different data types. For example, if the key is msg id and the values are Then how to store the values of different data types with a single key in the hashmap?
How to hash multiple values under the same key?
Take a look at Multimap from guava libraries and its implementation: HashMultimap. A collection similar to a Map, but can associate multiple values with a single key. If you call put(K, V) twice, with the same key but different values, the multimap contains mappings from the key to both values.