Add the values from an array of strings together

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!

It gives you 17, because you are adding digits, not numbers. 2 + 5 + 3 + 2 + 5 = 17, Use Integer.parseInt and then sum numbers. — Hubert Bratek
– Hubert Bratek, Commented Feb 2, 2019 at 1:45
Use String.split to split each line into 2 tokens, covert the second token to a number and sum it up. — sn42
– sn42, Commented Feb 2, 2019 at 1:47

Ryuzaki L · Accepted Answer · 2019-02-02 02:32:18Z

2

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();

answered Feb 2, 2019 at 2:32

Ryuzaki L

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Comments

jack ding · Accepted Answer · 2019-02-02 02:26:09Z

0

static Integer sumArray( String[] strArr ) {

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

    return sum;

}

You can do it like this.

answered Feb 2, 2019 at 2:26

jack ding

1

Comments

mnesarco · Accepted Answer · 2019-02-02 02:26:39Z

0

Split strings by spaces
parse the value into a number

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);

answered Feb 2, 2019 at 2:26

mnesarco

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Comments

shakhawat · Accepted Answer · 2019-02-02 02:31:30Z

0

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);

answered Feb 2, 2019 at 2:31

shakhawat

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