将文本解析为双数组

Question

To run an algorithm I need to use as input a text file. Input Example:

105.0,45.0,22.0
240.0,3.0,50.0
4344.0,4.0,55.0

On the algorithm i need to compute each row with each other(1st row with itself,2nd and 3rd row. 2nd row with 1st row, itself and 3rd row. 3rd row with 1st row,2nd row and itself). Output is a distance matrix with double values (input*input matrix so a 3*3 matrix in this case)

So far my code looks like this:

public class Distance{

public static double calcDist(int dim, double[] x, double[] y) {
//do computation here
//output printed here
}

public static void main(String[] args) throws IOException {

String str;
String inputX;
String inputY;
double arrayX = 0;
double arrayY = 0;
BufferedReader in = new BufferedReader(new FileReader("C:/input.txt"));


List<String> list = new ArrayList<String>();

while((str = in.readLine()) != null){
        list.add(str);
}


for(int i=0; i < list.size(); i++){
    for(int j=0; j < list.size(); j++){

        inputX = list.get(i);
        arrayX = Double.parseDouble(inputX);

        inputY = list.get(j);
        arrayY = Double.parseDouble(inputY);

        double[] x = {arrayX};
        double[] y = {arrayY};

    calcDist(x.length,x,y);
    }

}

The distance method runs on its own fine, but i'm getting various errors on the main. Numberformatexceptions. Should be somewhere on the parsing I guess. Help appreciated. Thanks in advance!

Answer 1

your inputX = stringArr[i].toString(); is apparently being 0 or something that cannot be parsed to Double . please check that and set some if-condition there if it makes sense for ya..

hope that helps