How to get data in new array, but not all (Java)

Question

I've got array like this

int[] array = {5, 100, 20, 66, 16};
    price = new int[] {5, 100, 20, 66, 16};
    for(int i = offset; i < price[price.length - readLength]; i++) {
        price[i] = price[i] * (discount / 100);
        System.out.println(price[i]);

    }

I need to get new array after this only with three numbers of the old array. How can I do it? I need after that something like this [100,20,66]

it seems strange that you are comparing indexes to prices ( i < price[whatever] ) — Gonen I
– Gonen I, Commented May 10, 2021 at 20:14

SomeDude · Accepted Answer · 2021-05-14 12:55:23Z

4

You could use Arrays.copyOfRange to get this:

price = Arrays.copyOfRange(array, 1, 4) and then you can do operations on each element.

Or you could get a new array from the original array using:

double[] discounted_price = 
    Arrays.stream(array,1,4).
                  mapToDouble(el ->el - el*(discount/100.0)).toArray();

You don't need to use a copy to pass to stream, you can specify, from, to in Arrays.stream itself.

And @WJS is correct that you might need to subtract price*discount from price depending on how you intend to use discount.

edited May 14, 2021 at 12:55

answered May 10, 2021 at 20:06

SomeDude

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3 Comments

CogsMaster Over a year ago

And how can I apply discount(in %) to this numbers in array?

WJS Over a year ago

@CogsMaster Did you see my answer?

Gonen I Over a year ago

IMHO a non functional solution would be clearer to an OP asking at this level. But I could be wrong of course.

WJS · Accepted Answer · 2021-05-10 20:40:16Z

Your code has some problems.

The following won't work unless price has been declared an array and it should be a double array since you probably want the result to be a floating point number.

   double[] price = new double[3];

This will be a problem unless discount is a double or float. Also, consider that if something costs $2 and the discount is 10% then the cost will be: 2.00 - (2.00 * .10). So you should change:

   price[i] = price[i] * (discount/100);

To

   price[i] = price[i] - (price[i] * (discount/100.));

To copy array you can either use a for loop or the Arrays.copyOfRange() method as already mentioned. If you want random values you have to do individual assignments. The for loop would look like:

int k = 0 ;
for (int i = 1; i < 4; i++) { // copies values at indices 1,2, and 3
  price[k++] = array[i];
}

Aliaksandr Veramkovich · Accepted Answer · 2021-05-10 20:05:06Z

1

Try to use:

Arrays.copyOfRange()

answered May 10, 2021 at 20:05

Aliaksandr Veramkovich

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1 Comment

Zabuzard Over a year ago

Helpful, but not detailed at all. Please show a full solution with explanation and possibly also links to the documentation. Read How to Answer. Your answer is low-quality.

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