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I found it in the map api for java... neverless I decided to use this function:


double total = 0;
for (Double value : voltages.values()) {
total = total + value;

Is there a...

Well this is the example I found which might be useful but I wasn't able to adapt it:


// Compute sum of salaries by department
Map<Department, Integer> totalByDept = employees.stream()...

.collect(Collectors.groupingBy(Employee::getDepartment,
Collectors.summingInt(Employee::getSalary)));

I was trying to use above example get the sum but I was not able to adapt it so it would work...

I have seen a loop what it firstly takes the size and then calculates the sum. But I know there is an easier way using for loop... but could find an example which would help me.

Hi there;

Just a simple question which has caused me problems.

I created hashtable:


private Map <String, Double> v = new ConcurrentHashMap<String, Double>();