Commons Lang、NumberUtils.stringToInt()

import org.apache.commons.lang.math.NumberUtils;

public class C2008123000 {
    public static void main(String[] args) {
        System.out.println(NumberUtils.stringToInt("123"));
        System.out.println(NumberUtils.stringToInt("1.23"));
        System.out.println(NumberUtils.stringToInt(null));

        System.out.println(NumberUtils.stringToInt("1.23", 999));
        System.out.println(NumberUtils.stringToInt(null, 999));
    }
}

で、

123
0
0
999
999