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

问题

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?

回答1:

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.
}

回答2:

class Globals {
   static String ouch = "I'm global.."
}

println Globals.ouch

回答3:

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

回答4:

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;
    }
}

回答5:

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?

回答6:

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

}

回答7:

def sum = 0

// This method stores a value in a global variable.
def add =
{ 
    input1 , input2 ->
    sum = input1 + input2;
}

// This method uses stored value.
def multiplySum =   
{
    input1 ->
        return sum*input1;
}

add(1,2);
multiplySum(10);

回答8:

Could not figure out what you want, but you need something like this ? :

def a = { b -> 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

来源：https://stackoverflow.com/questions/6305910/how-do-i-create-and-access-the-global-variables-in-groovy

标签

groovy