在groovy中使用闭包时出错

我也是新来的，非常棒。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

。但我也有错误

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

我不明白变量square是如何在静态范围内找到的

---

谢谢

您忘记了

def

关键字：

 static void main(def args){
     def square = {it * it}
     [1,2,3].each(square);
 }

---

您忘记了

def

关键字：

 static void main(def args){
     def square = {it * it}
     [1,2,3].each(square);
 }

---

另外，类应该有大写的名称

class Function1

，并且只有

static main（args）{

可以在Groovy中使用。因此，类应该有大写的名称

class Function1

，只有

static main（args）{

可以在Groovy中使用Groovy@Optimus，@IgorArtamonov，我想补充一点：您只能使用未声明的变量使用时（即不使用

def

或显式键入）。您也可以自己使用。@Optimus，@IgorArtamonov，我想补充一点：在使用时，您只能使用未声明的变量（即不使用

def

或显式键入）。您也可以自己使用。