How to sum values from Java Hashmap [duplicate]

Question

I need some help, I'm learning by myself how to deal with maps in Java ando today i was trying to get the sum of the values from a Hashmap but now Im stuck.

This are the map values that I want to sum.

HashMap<String, Float> map = new HashMap<String, Float>();  map.put("First Val", (float) 33.0); map.put("Second Val", (float) 24.0); 

Ass an additional question, what if I have 10 or 20 values in a map, how can I sum all of them, do I need to make a "for"?

Regards and thanks for the help.

Answer 1

If you need to add all the values in a Map, try this:

float sum = 0.0f; for (float f : map.values()) {     sum += f; } 

At the end, the sum variable will contain the answer. So yes, for traversing a Map's values it's best to use a for loop.