How do I create and access the global variables in Groovy

Question

I need to store a value in a variable in one method and then I need to use that value from that variable in another method or closure  How can I share this value

User · Answer

I think you are talking about class level variables. As mentioned above using global variable/class level variables are not a good practice.

If you really want to use it. and if you are sure that there will not be impact...

Declare any variable out side the method. at the class level with out the variable type

eg:

{
   method()
   {
      a=10
      print(a)
   }

// def a or int a wont work

a=0

}

User · Answer

Just declare the variable at class or script scope  then access it from inside your methods or closures   Without an example  it s hard to be more specific for your particular problem though   However  global variables are generally considered bad form   Why not return the variable from one function  then pass it into the next

User · Answer

def iamnotglobal 100    This will not be accessible inside the function  iamglobal 200    this is global and will be even available inside the   def func         log info  My value is 200  Here you see     iamglobal     iamglobal 400       log info  if you uncomment me you will get error  Since iamnotglobal cant be printed here     iamnotglobal   def func2        log info  My value was changed inside func to 400   Here it is       iamglobal   func   func2     here iamglobal variable is a global variable used by func and then again available to func2  if you declare variable with def it will be local  if you don t use def its global

User · Answer

In a Groovy script the scoping can be different than expected  That is because a Groovy script in itself is a class with a method that will run the code  but that is all done runtime  We can define a variable to be scoped to the script by either omitting the type definition or in Groovy 1 8 we can add the  Field annotation   import groovy transform Field  var1    var1   Field String var2    var2  def var3    var3   void printVars         println var1     println var2     println var3    This won t work  because not in script scope

User · Answer

class Globals      static String ouch    I m global       println Globals ouch

User · Answer

Could not figure out what you want  but you need something like this        def a     b - gt  b   1    bValue   a   println b    prints 1   Now bValue contains the value of b which is a variable in the closure a  Now you can do anything with bValue Let me know if i have misunderstood your question

User · Answer

def sum   0     This method stores a value in a global variable  def add          input1   input2 - gt      sum   input1   input2        This method uses stored value  def multiplySum            input1 - gt          return sum input1     add 1 2   multiplySum 10

User · Answer

Like all OO languages  Groovy has no concept of  global  by itself  unlike  say  BASIC  Python or Perl    If you have several methods that need to share the same variable  use a field   class Foo       def a       def foo             a   1            def bar             print a

[groovy] How do I create and access the global variables in Groovy?

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