public class IsString {
public static boolean isNum(String str){
return str.matches("^[-+]?(([0-9]+)([.]([0-9]+))?|([.]([0-9]+))?)$");
}
@Test
public void test(){
String str = "12344.33";
System.out.println(IsString.isNum(str));
}
}
原文：https://www.cnblogs.com/fulucky/p/9636407.html