Java Instance of Checking Whether User Input Contains at Least N Decimal Places

Determine whether the user's input contains at least N decimal places.

1An exception is thrown when the user enters non-numeric values, and false is returned.

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);//Force the string to be converted to a number
   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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