Java: Check if String only contains Numbers

You can just use the function .isNumeric(). A string can be passed to this function and you get TRUE or FALSE as a result depending on the content of the string:

if (StringUtils.isNumeric("123")) {  // true

}

if (StringUtils.isNumeric("ABC")) {  // false

}

if (StringUtils.isNumeric("1 3")) {  // false

}

In this example, accordingly, only "123" would result in TRUE because the strings "ABC" and "1 3" are not only consisting of digits.
2016-08-05 at 13:04