将字符串数组中的值相加

Question

I have an array of strings with products and values in it. Laid out like so:

ProductA 200
ProductB 50
ProductC 120
ProductD 1100
ProductE 5

I need to find the sum of all these numbers. The best I have been able to do is use this code to find the sum but it is finding the sum of each individual number:

for (char c : rdmPrize.replaceAll("\\D", "").toCharArray())
{
    int digit = c - '0';
    sum += digit;
    if (digit % 2 == 0)
    {
        evenSum += digit;
    }
}

The output it is giving me in this example would be 17, but I need it to be 1475.

Any ideas?

Thanks!

Answer 1

You can do this by using split on string and get the value at index 1

String[] arr = {"ProductA 200","ProductB 50","ProductC 120","ProductD 1100","ProductE 5"};
    int sum =0;
    for(String s : arr) {
        sum+=Integer.parseInt(s.split(" ")[1]);
    }
    System.out.println(sum);   //1475

By using java-8

int total = Arrays.stream(arr).mapToInt(str->Integer.parseInt(str.split(" ")[1])).sum();

Answer 2

static Integer sumArray( String[] strArr ) {

    Integer sum = 0;
    for ( String numStr : strArr ) {
        sum += Integer.parseInt( numStr );
    }

    return sum;

}

You can do it like this.

Answer 3

1. Split strings by spaces
2. parse the value into a number

3. Sum

    String[] rdmprice = { "ProductA 200", "ProductB 50", "ProductC 120", "ProductD 1100", "ProductE 5" }; BigDecimal result = Arrays.stream(rdmprice) .map(i -> new BigDecimal(i.split("\\\\s+")[1])) .reduce(BigDecimal.ZERO, BigDecimal::add); System.out.printf("Result: %f", result); 

Answer 4

Split every input line by space, you will get an array of space separated strings. Then just parse the desired element to int and add it to the sum.

// input[0] = the product name string
// input[1] = the number string

int sum = 0;

for (String[] input : rdmPrize.split(" ")) {
    sum += Integer.parseInt(input[1]);
}

System.out.println(sum);