Convert String to double in Java

Question

How can I convert a String such as  12 34  to a double in Java

User · Answer

If you have problems in parsing string to decimal values  you need to replace     in the number to        String number    123 321   double value   Double parseDouble  number replace

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Used this to convert any String number to double when u need int just convert the data type from num and num2 to int   took all the cases for any string double with Eng  Bader Qandeel    public static double str2doubel String str        double num   0      double num2   0      int idForDot   str indexOf           boolean isNeg   false      String st      int start   0      int end   str length         if  idForDot    -1            st   str substring 0  idForDot           for  int i   str length   - 1  i  gt   idForDot   1  i--                num2    num2   str charAt i  -  0     10                  else           st   str             if  st charAt 0      -             isNeg   true          start          else if  st charAt 0                    start               for  int i   start  i  lt  st length    i              if  st charAt i                        continue                    num    10          num    st charAt i  -  0              num   num   num2      if  isNeg            num   -1   num            return num

User · Answer

Use new BigDecimal string   This will guarantee proper calculation later   As a rule of thumb - always use BigDecimal for sensitive calculations like money   Example   String doubleAsString    23 23   BigDecimal price   new BigDecimal doubleAsString   BigDecimal total   price plus anotherPrice

User · Answer

You can use Double parseDouble   to convert a String to a double   String text    12 34      example String double value   Double parseDouble text     For your case it looks like you want   double total   Double parseDouble jlbTotal getText     double price   Double parseDouble jlbPrice getText

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You only need to parse String values using Double  String someValue   52 23   Double doubleVal   Double parseDouble someValue   System out println doubleVal

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String double string    100 215   Double double   Double parseDouble double string

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String s    12 34   double num   Double valueOf s

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There is another way too   Double temp   Double valueOf str   number   temp doubleValue      Double is a class and  temp  is a variable   number  is the final number you are looking for

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Try this  BigDecimal bdVal   new BigDecimal str   If you want Double only then try Double d   Double valueOf str   System out println String format  quot   3f quot   new BigDecimal d

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This is what I would do      public static double convertToDouble String temp          String a   temp           replace all commas if present with no comma        String s   a replaceAll         trim              if there are any empty spaces also take it out                  String f   s replaceAll                    now convert the string to double       double result   Double parseDouble f        return result     return the result     For example you input the String  4 55 63  0   the  output will the double number 45563 0

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To convert a string back into a double  try the following  String s    10 1   Double d   Double parseDouble s     The parseDouble method will achieve the desired effect  and so will the Double valueOf   method

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double d   Double parseDouble aString     This should convert the string aString into the double d

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Using Double parseDouble   without surrounding try catch block can cause potential NumberFormatException had the input double string not conforming to a valid format    Guava offers a utility method for this which returns null in case your String can t be parsed   https   google github io guava releases 19 0 api docs com google common primitives Doubles html tryParse java lang String   Double valueDouble   Doubles tryParse aPotentiallyCorruptedDoubleString     In runtime  a malformed String input yields null assigned to valueDouble

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Citing the quote from Robertiano above again - because this is by far the most versatile and localization adaptive version  It deserves a full post   Another option    DecimalFormat df   new DecimalFormat     DecimalFormatSymbols sfs   new DecimalFormatSymbols    sfs setDecimalSeparator        df setDecimalFormatSymbols sfs   double d   df parse number  doubleValue

[java] Convert String to double in Java

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