How to create iterators for hashmap in Java?

Answer 1

https://stackoverflow.com/questions/1066589/iterate-through-a-hashmap

Answer 2

See if this helps

your_HashMap.forEach((k,v) -> your statement);

Answer 3

You have many ways:

For only keys.... use keySet() method
For only values... use values()
For pair.... use entrySet()

All of these return a Collection where you have an iterator() method

Read docs... https://docs.oracle.com/en/java/javase/14/docs/api/java.base/java/util/Map.html

Example JDK10+:

for (var it = myMap.entrySet().iterator(); it.hasNext();) {
var entry = it.next();
var key = entry.getKey();
var value = entry.getValue();
.....
}

This is the imperative programming way. If you need mutate states I recommed you adopt functional programming using Stream and lambda functions to preserve data Inmutability

The basic...

myMap.forEach((key, value) -> {
......
});

Advanced.... through methods I tell you at the begining and using their .stream() as start point to beging chain operations.

https://docs.oracle.com/en/java/javase/14/docs/api/java.base/java/util/stream/package-summary.html