Beispiel zur Überprüfung, ob die Benutzeranmeldung mindestens N Dezimalstellen enthält

Überprüfen Sie, ob die Benutzer-Eingabe mindestens N Dezimalstellen enthält.

1Wenn der Benutzer eine nicht-numerische Eingabe vornimmt, wird eine Ausnahme ausgelöst und false zurückgegeben.

2.When the user enters a number, judge whether it contains at least N decimal places. If it does not contain, return false.

3.When the decimal places of the number entered by the user are greater than or equal to N, return true.

public class ddouble {
 public static void main(String args[]) {
  String str = " .1124 ";
  boolean sfdouble = doubleyn(str,4);
  System.out.println(sfdouble);
 }
 public static boolean doubleyn(String str,int dousize){
  try {
   double num=Double.valueOf(str);//Convert the string to a number by force
   if(str.trim().indexOf(".")=== -1{
    return false;
   }
   int fourplace = str.trim().length() - str.trim().indexOf(".") - 1;
   if(fourplace<dousize){
    return false;
   }
    return true;
   }
  }
   return false;//If an exception is thrown, return False
  }
 }
}

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