我也是新手。我有简单的代码来学习groovy闭包。 我的代码是
class function1{
static void main(def args){
square = {it * it}
[1,2,3].each(square);
}
}
因此,程序的输出应该是1,4,9
。但是我收到了错误
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
/home/xxx/GroovyTest/example2.groovy: 4: Apparent variable 'square' was found in a static scope but doesn't refer to a local variable, static field or class. Possible causes:
You attempted to reference a variable in the binding or an instance variable from a static context.
You misspelled a classname or statically imported field. Please check the spelling.
You attempted to use a method 'square' but left out brackets in a place not allowed by the grammar.
@ line 4, column 3.
square = {it * it}
^
/home/xxx/GroovyTest/example2.groovy: 5: Apparent variable 'square' was found in a static scope but doesn't refer to a local variable, static field or class. Possible causes:
You attempted to reference a variable in the binding or an instance variable from a static context.
You misspelled a classname or statically imported field. Please check the spelling.
You attempted to use a method 'square' but left out brackets in a place not allowed by the grammar.
@ line 5, column 16.
[1,2,3].each(square)
^
2 errors
我没有得到静态范围中变量square的变化。
谢谢
答案 0 :(得分:2)
您忘记了def
关键字:
static void main(def args){
def square = {it * it}
[1,2,3].each(square);
}