How about something like this:
```java
public static boolean isNumeric(String str, boolean allowDot) {
if (str == null) {
return false;
}
int sz = str.length();
for (int i = 0; i < sz; i++) {
if ((!allowDot && str.charAt(i) == '.') ||
!Character.isDigit(str.charAt(i))) {
return false;
}
}
return true;
}
```
Not tested yet. Just for your information. In this way we can unify the logic
into one method.
And call isNumeric(value, true) from ClassHelper.
[ Full content available at:
https://github.com/apache/incubator-dubbo/pull/3093 ]
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