Is there possibility of sum of ArrayList without looping
JavaJava Problem Overview
Is there possibility of sum of ArrayList
without looping?
PHP provides sum(array)
which will give the sum of array.
The PHP code is like
$a = array(2, 4, 6, 8);
echo "sum(a) = " . array_sum($a) . "\n";
I wanted to do the same in Java:
List tt = new ArrayList();
tt.add(1);
tt.add(2);
tt.add(3);
Java Solutions
Solution 1 - Java
Once [tag:java-8] is out (March 2014) you'll be able to use streams:
If you have a List<Integer>
int sum = list.stream().mapToInt(Integer::intValue).sum();
If it's an int[]
int sum = IntStream.of(a).sum();
Solution 2 - Java
Then write it yourself:
public int sum(List<Integer> list) {
int sum = 0;
for (int i : list)
sum = sum + i;
return sum;
}
Solution 3 - Java
The only alternative to using a loop is to use recursion.
You can define a method like
public static int sum(List<Integer> ints) {
return ints.isEmpty() ? 0 : ints.get(0) + ints.subList(1, ints.length());
}
This is very inefficient compared to using a plain loop and can blow up if you have many elements in the list.
An alternative which avoid a stack overflow is to use.
public static int sum(List<Integer> ints) {
int len = ints.size();
if (len == 0) return 0;
if (len == 1) return ints.get(0);
return sum(ints.subList(0, len/2)) + sum(ints.subList(len/2, len));
}
This is just as inefficient, but will avoid a stack overflow.
The shortest way to write the same thing is
int sum = 0, a[] = {2, 4, 6, 8};
for(int i: a) {
sum += i;
}
System.out.println("sum(a) = " + sum);
prints
sum(a) = 20
Solution 4 - Java
Write a util function like
public class ListUtil{
public static int sum(List<Integer> list){
if(list==null || list.size()<1)
return 0;
int sum = 0;
for(Integer i: list)
sum = sum+i;
return sum;
}
}
Then use like
int sum = ListUtil.sum(yourArrayList)
Solution 5 - Java
for me the clearest way is this:
doubleList.stream().reduce((a,b)->a+b).get();
or
doubleList.parallelStream().reduce((a,b)->a+b).get();
It also use internal loops, but it is not possible without loops.
Solution 6 - Java
You can use apache commons-collections API.
class AggregateClosure implements org.apache.commons.collections.Closure {
int total = 0;
@Override
public void execute(Object input) {
if (input != null) {
total += (Integer) input;
}
}
public int getTotal() {
return total;
}
}
Then use this closure as shown below:
public int aggregate(List<Integer> aList) {
AggregateClosure closure = new AggregateClosure();
org.apache.commons.collections.CollectionUtils.forAllDo(aList, closure);
return closure.getTotal();
}
Solution 7 - Java
If you know about the map function, then you know that a map is also can be recursive loop or recursive loop. But obviously you have to reach each element for that. so, I could not work out the Java 8, because some syntax mismatch but wanted a very short so this is what I got.
int sum = 0
for (Integer e : myList) sum += e;
Solution 8 - Java
This can be done with reduce using method references reduce(Integer::sum)
:
Integer reduceSum = Arrays.asList(1, 3, 4, 6, 4)
.stream()
.reduce(Integer::sum)
.get();
Or without Optional
:
Integer reduceSum = Arrays.asList(1, 3, 4, 6, 4)
.stream()
.reduce(0, Integer::sum);
Solution 9 - Java
Given that a list can hold any type of object, there is no built in method which allows you to sum all the elements. You could do something like this:
int sum = 0;
for( Integer i : ( ArrayList<Integer> )tt ) {
sum += i;
}
Alternatively you could create your own container type which inherits from ArrayList but also implements a method called sum() which implements the code above.
Solution 10 - Java
ArrayList is a Collection of elements (in the form of list), primitive are stored as wrapper class object but at the same time i can store objects of String class as well. SUM will not make sense in that. BTW why are so afraid to use for loop (enhanced or through iterator) anyways?
Solution 11 - Java
Or switch to Groovy, it has a sum() function on a collection. [1,2,3,4,5,6].sum()
http://groovy.codehaus.org/JN1015-Collections
Runs on the same JVM as your java classes.
Solution 12 - Java
This link shows three different ways how to sum in java, there is one option that is not in previous answers using Apache Commons Math..
Example:
public static void main(String args []){
List<Double> NUMBERS_FOR_SUM = new ArrayList<Double>(){
{
add(5D);
add(3.2D);
add(7D);
}
};
double[] arrayToSume = ArrayUtils.toPrimitive(NUMBERS_FOR_SUM
.toArray(new Double[NUMBERS_FOR_SUM.size()]));
System.out.println(StatUtils.sum(arrayToSume));
}
See StatUtils api
Solution 13 - Java
You can use GNU Trove library:
TIntList tt = new TIntArrayList();
tt.add(1);
tt.add(2);
tt.add(3);
int sum = tt.sum();