Final Hashmap In Java

Once we import the package, here is how we can create hashmaps in java. If the key is null, the value is stored in table [0] position. The most recent versions of java offer the map.of methods to produce an unmodifiable map object with convenient literal syntax.

1 hashmap is extended so it's not a final class, but some methods are made final so their behaviour can be assumed. With the above statement the system can understands that we are going to store a set of string objects (values) and each such object is identified by an integer object (key). The java.util.hashmap.put () method of hashmap is used to insert a mapping into a map.

Hashmap<integer, string> hm = new hashmap<integer, string>();

As you can see, this syntax lets me add static, predefined data to my java map/hashmap. It is useful while mapping a key to a value. We can initialize a hashmap using a static block of code: However, in this article, we'll dig a bit deeper and explain why interfaces are useful.