Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

public class Main {
    /**
     * Parse an integer located between 2 given offsets in a string
     * 
     * @param value the string to parse
     * @param beginIndex the start index for the integer in the string
     * @param endIndex the end index for the integer in the string
     * @return the int
     * @throws NumberFormatException if the value is not a number
     */
    private static int parseInt(String value, int beginIndex, int endIndex) throws NumberFormatException {
        if (beginIndex < 0 || endIndex > value.length() || beginIndex > endIndex) {
            throw new NumberFormatException(value);
        }
        // use same logic as in Integer.parseInt() but less generic we're not supporting negative values
        int i = beginIndex;
        int result = 0;
        int digit;
        if (i < endIndex) {
            digit = Character.digit(value.charAt(i++), 10);
            if (digit < 0) {
                throw new NumberFormatException("Invalid number: " + value.substring(beginIndex, endIndex));
            }
            result = -digit;
        }
        while (i < endIndex) {
            digit = Character.digit(value.charAt(i++), 10);
            if (digit < 0) {
                throw new NumberFormatException("Invalid number: " + value.substring(beginIndex, endIndex));
            }
            result *= 10;
            result -= digit;
        }
        return -result;
    }
}