Check_If_String_Contains_only_Digit

package interview;

public class Check_If_String_Contains_only_Digit {

public static void main(String[] args)
{
  String str = "Error 404 detected in server 589.90 ";
  char[] ch = str.toCharArray();
  System.out.println(ch);
  String str2 = str.replaceAll("[^0-9]","");
  System.out.println(str2);
}

}