StringUtils里的isEmpty和isBlank的区别

@Test
void stringTest(){
    String a = " ";
    boolean empty = StringUtils.isEmpty(a);
    boolean blank = StringUtils.isBlank(a);
    System.out.println(empty);//false
    System.out.println(blank);//true
}

public static boolean isEmpty(CharSequence cs) {
    return cs == null || cs.length() == 0;
}

public static boolean isBlank(CharSequence cs) {
    int strLen;
    if (cs != null && (strLen = cs.length()) != 0) {
        for(int i = 0; i < strLen; ++i) {
　　　　　　　// 判断字符是否为空格、制表符、tab
            if (!Character.isWhitespace(cs.charAt(i))) {
                return false;
            }
        }
        return true;
    } else {
        return true;
    }
}