package utils;
public class MyUtil{
/**
* Extract the the first double from string.
* i.e. “123.456” => 123.456
* i.e. “abc123.456efg” => 123.456
* i.e. “abc123.” => 123
*
*
* @param text input text, may be null
* @return {@code double} extracted from text
*/
public static double parseDouble(String text){
if(text == null) {
return 0;
}
int pos=0;
double number;
while (pos < text.length() && !Character.isDigit(text.charAt(pos)) ){ pos++; } int start = pos; while (pos < text.length() && Character.isDigit(text.charAt(pos)) ){ pos++; } // check period in a sequence. Note that valid double has only single period in a seq if (pos+1 < text.length() && text.charAt(pos) == '.' && Character.isDigit(text.charAt(pos+1))) { pos++; while (pos < text.length() && Character.isDigit(text.charAt(pos))){ pos++; } } if (start == pos){ // when there is no number in text return 0; } System.out.println(text.substring(start, pos)); number = Double.parseDouble(text.substring(start, pos)); return number; } }