I was trying to achieve something like this using lambdas. However, "i" has to be final.
int i = 1;
for (Object obj : list) {
if (something) {
i++;
}
}
edit:
But what if I wanted to add, let's say, a value that is different from object to object?
int i = 1;
for (Object obj : list) {
if (something) {
otherMethod(i);
i += obj.getValue();
}
}
You can do it like this instead:
int i = 1 + (int)list.stream().filter(something).count();
where something is the criteria to filter.
otherMethod and the type returned from getValue.As in the first answer written to count the elements, you first filter, then reduce (with count()).
list.stream().filter(obj -> something).count();
But if do not want to count the items, but use instead some value depending on the object, you should first map the stream to the intermediate values, and reduce them with e.g. sum.
list.stream()
.filter(obj -> something)
.mapToInt(obj -> obj.getValue())
.sum()
You should never modify anything while using streams. (forEach can be an exception).
