Commons Lang、StringUtils.stripStart()

まんま

import org.apache.commons.lang.StringUtils;

public class C2008112300 {
    public static void main(String[] args) {
        System.out.println(StringUtils.stripStart(null, "") + "*");
        System.out.println(StringUtils.stripStart("", "") + "*");
        System.out.println(StringUtils.stripStart("abc", "") + "*");
        System.out.println(StringUtils.stripStart("abc", null) + "*");
        System.out.println(StringUtils.stripStart("  abc", null) + "*");
        System.out.println(StringUtils.stripStart("abc  ", null) + "*");
        System.out.println(StringUtils.stripStart(" abc ", null) + "*");
        System.out.println(StringUtils.stripStart("yxabc  ", "xyz") + "*");
    }
}

で、

null*
*
abc*
abc*
abc*
abc  *
abc *
abc  *