Java String substring from right
public class Main { public static void main(String[] argv) throws Exception { String str = "demo2s.com"; int len = 2;/* w w w . j a v a 2 s . c o m*/ System.out.println(right(str, len)); } public static final String EMPTY = ""; /** * <p> * Gets the rightmost <code>len</code> characters of a String. * </p> * * <p> * If <code>len</code> characters are not available, or the String is * <code>null</code>, the String will be returned without an an exception. An * exception is thrown if len is negative. * </p> * * <pre> * right(null, *) = null * right(*, -ve) = "" * right("", *) = "" * right("abc", 0) = "" * right("abc", 2) = "bc" * right("abc", 4) = "abc" * </pre> * * @param str * the String to get the rightmost characters from, may be null * @param len * the length of the required String, must be zero or positive * @return the rightmost characters, <code>null</code> if null String input */ public static String right(String str, int len) { if (str == null) { return null; } if (len < 0) { return EMPTY; } if (str.length() <= len) { return str; } return str.substring(str.length() - len); } }