Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

public class Main {
    public static int parseInt(char[] string, int start, int length, int radix) throws NumberFormatException {
        if (radix < Character.MIN_RADIX || radix > Character.MAX_RADIX) {
            throw new NumberFormatException("Invalid radix: " + radix);
        }
        if (string == null) {
            throw new NumberFormatException(new String(string, start, length));
        }
        int i = 0;
        if (length == 0) {
            throw new NumberFormatException(new String(string, start, length));
        }
        boolean negative = string[start + i] == '-';
        if (negative && ++i == length) {
            throw new NumberFormatException(new String(string, start, length));
        }

        return parse(string, start, length, i, radix, negative);
    }

    private static int parse(char[] string, int start, int length, int offset, int radix, boolean negative)
            throws NumberFormatException {
        int max = Integer.MIN_VALUE / radix;
        int result = 0;
        while (offset < length) {
            int digit = Character.digit(string[start + (offset++)], radix);
            if (digit == -1) {
                throw new NumberFormatException(new String(string, start, length));
            }
            if (max > result) {
                throw new NumberFormatException(new String(string, start, length));
            }
            int next = result * radix - digit;
            if (next > result) {
                throw new NumberFormatException(new String(string, start, length));
            }
            result = next;
        }
        if (!negative) {
            result = -result;
            if (result < 0) {
                throw new NumberFormatException(new String(string, start, length));
            }
        }
        return result;
    }
}