Adding double values that are stored in an arraylist

Question

I've been searching for a way to do this and have come up empty and hoping someone may have an idea. I have an arrayList that is storing objects such as

{addToList, firstName, lastName, 1.0} 
{addToList, firstName, lastName, 0.5} 
{addToList, firstName, lastName, 0.5} 
{addToList, firstName, lastName, 1.5}

I need a way to add the values of the double amount from all of the objects, so I can get an output of

total amount is $4.5

Any help is appreciated =)

@Newb2Java then see Amonie's answer, does exactly what you want. — dumbPotato21
– dumbPotato21, Commented May 22, 2017 at 16:58
It is ok. If you can add your code we can get an idea about what you are trying and we can point reasons to errors. — Blasanka
– Blasanka, Commented May 22, 2017 at 17:05

Ousmane D. · Accepted Answer · 2017-05-22 16:51:19Z

3

here is one solution to accomplishing your task:

double sum = myList.stream().mapToDouble(ObjectType::getAmount).sum();
System.out.println("total amount is  $" + sum);

where ObjectType is your class name and getAmount is the getter for the price within each object.

answered May 22, 2017 at 16:51

Ousmane D.

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