Converting a string to int in Groovy

Question

I have a String that represents an integer value and would like to convert it to an int  Is there a groovy equivalent of Java s Integer parseInt String

User · Answer

The Simpler Way Of Converting A String To Integer In Groovy Is As Follows     String aa  25  int i  aa toInteger     Now  i  Holds The Integer Value

User · Answer

def str    32   int num   str as Integer

User · Answer

also you can make static import   import static java lang Integer parseInt as asInteger   and after this use   String s    99  asInteger s

User · Answer

As an addendum to Don s answer  not only does groovy add a  toInteger   method to Strings  it also adds toBigDecimal    toBigInteger    toBoolean    toCharacter    toDouble    toFloat    toList    and toLong     In the same vein  groovy also adds is  eqivalents to all of those that return true if the String in question can be parsed into the format in question   The relevant GDK page is here

User · Answer

Use the toInteger   method to convert a String to an Integer  e g   int value    99  toInteger     An alternative  which avoids using a deprecated method  see below  is  int value    66  as Integer   If you need to check whether the String can be converted before performing the conversion  use   String number    66   if  number isInteger        int value   number as Integer     Deprecation Update  In recent versions of Groovy one of the  toInteger   methods has been deprecated  The following is taken from org codehaus groovy runtime StringGroovyMethods in Groovy 2 4 4         Parse a CharSequence into an Integer        param self a CharSequence     return an Integer     since 1 8 2     public static Integer toInteger CharSequence self        return Integer valueOf self toString   trim                deprecated Use the CharSequence version     see  toInteger CharSequence       Deprecated public static Integer toInteger String self        return toInteger  CharSequence  self       You can force the non-deprecated version of the method to be called using something awful like   int num     CharSequence   66   toInteger     Personally  I much prefer   int num   66 as Integer

User · Answer

toInteger   method is available in groovy  you could use that

User · Answer

Well  Groovy accepts the Java form just fine  If you are asking if there is a Groovier way  there is a way to go to Integer   Both are shown here   String s    99  assert 99    Integer parseInt s  Integer i   s as Integer assert 99    i

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Here is the an other way  if you don t like exceptions    def strnumber    100  def intValue   strnumber isInteger       strnumber as int    null

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I m not sure if it was introduced in recent versions of groovy  initial answer is fairly old   but now you can use   def num   mystring  isInteger     mystring toInteger     null   or  def num   mystring  isFloat     mystring toFloat     null   I recommend using floats or even doubles instead of integers in the case if the provided string is unreliable

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Several ways to achieve this  Examples are as below  a  return  22  toInteger   b  if  22  isInteger    return  22  toInteger   c  return  22  as Integer   d  return Integer parseInt  22     Hope this helps

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The way to use should still be the toInteger    because it is not really deprecated   int value    99  toInteger     The String version is deprecated  but the CharSequence is an Interface that a String implements  So  using a String is ok  because your code will still works even when the method will only work with CharSequence  Same goes for isInteger    See this question for reference   How to convert a String to CharSequence   I commented  because the notion of deprecated on this method got me confuse and I want to avoid that for other people

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Groovy Style conversion   Integer num    589  as Integer   If you have request parameter   Integer age   params int  age

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Several ways to do it  this one s my favorite   def number    123  as int

[groovy] Converting a string to int in Groovy

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