Java tutorial
//package com.java2s; // From org.springframework.util.StringUtils, under Apache License 2.0 public class Main { /** * <p>Checks if a CharSequence is not empty (""), not null and not whitespace only.</p> * <p> * <pre> * StringUtils.isNotBlank(null) = false * StringUtils.isNotBlank("") = false * StringUtils.isNotBlank(" ") = false * StringUtils.isNotBlank("bob") = true * StringUtils.isNotBlank(" bob ") = true * </pre> * * @param cs the CharSequence to check, may be null * @return {@code true} if the CharSequence is * not empty and not null and not whitespace * @since 3.0 Changed signature from isNotBlank(String) to isNotBlank(CharSequence) */ public static boolean isNotBlank(final CharSequence cs) { return !isBlank(cs); } /** * <p>Checks if a CharSequence is whitespace, empty ("") or null.</p> * <p> * <pre> * StringUtils.isBlank(null) = true * StringUtils.isBlank("") = true * StringUtils.isBlank(" ") = true * StringUtils.isBlank("bob") = false * StringUtils.isBlank(" bob ") = false * </pre> * * @param cs the CharSequence to check, may be null * @return {@code true} if the CharSequence is null, empty or whitespace * @since 3.0 Changed signature from isBlank(String) to isBlank(CharSequence) */ public static boolean isBlank(final CharSequence cs) { int strLen; if (cs == null || (strLen = cs.length()) == 0) { return true; } for (int i = 0; i < strLen; i++) { if (Character.isWhitespace(cs.charAt(i)) == false) { return false; } } return true; } }