Question

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How to return multiple objects from a Java method?

lets say N= a+b;
for a number N i want to generate the all possible values a and b. like
if N =7 a and b are (1+6),(2+5),(3+4).

i have coded this logic in a method.

static void sumofNum(int N){

        for(int a=1; a<N; a++){
                //a+b=N
                int b = N-a;
                System.out.println(a+","+b);
                int next =a+1;
                if(next==b | a==b)
                    return;
        }   
    }

i want to return (1,6),(2,5),(3,4) from this method. next for any N there can be more (a,b) combinations to be returned from this method.

Answer 1

If you want to return them as ints, define a object that contains two ints (or abuse points as I have done below) and return a list of those objects. If you define your own object, just replace point with that.

static ArrayList<Point> sumofNum(int N){
    ArrayList<Point> result = new ArrayList<Point>();
    for(int a=1; a<N; a++){
            //a+b=N
            int b = N-a;
        System.out.println(a+","+b);
        int next =a+1;
        if(next==b | a==b)
           result.add(new Point(a,b));
        }   
    return result;
    }

You can get your results from the list with:

results = sumofNum(7);
int a = results.get(0).x; //a = 1
int b = results.get(0).y; //b = 6