Java Iterating Over Map

Iterating over a map in java a map is an object that contains a collection of key/value pairs. How to iterate a java 8 map: Iterate through a hashmap entryset using iterators.

The following complete example shows how to iterate over all of the elements in a java map (or hashmap) using both a) the java 8 style and b) the type of code you had to use prior. Before we iterate through a map using the three methods, let's understand what these methods do: Each key can map to at most one value.

Notice that we are independently iterating through the keys, values, and key/value mappings.

Map<string, string> idmap = new hashmap<> (); So we will have to use treemap.entryset () method. First invoke entryset ().stream () method which inturn returns stream object. As of java 8, we can use the foreach method as well as the iterator class to loop over a map.