Hi,
How about this:
```java
public static boolean isNumeric(String str, boolean allowDot) {
if (str == null || str.isEmpty()) {
return false;
}
int dotCount = 0;
for (int i = 0; i < str.length(); i++) {
if (str.charAt(i) == '.') {
if (allowDot && dotCount == 0) {
dotCount++;
continue;
} else {
return false;
}
}
if (!Character.isDigit(str.charAt(i))) {
return false;
}
}
return true;
}
```
This only need 1 loop. And also support something like "1." as a numeric.
```
jshell> Double.valueOf("1.")
$1 ==> 1.0
```
I also add some more unit test
```java
assertThat(StringUtils.isNumeric("123.3.3", true), is(false));
assertThat(StringUtils.isNumeric("123.", true), is(true));
```
[ Full content available at:
https://github.com/apache/incubator-dubbo/pull/3093 ]
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