我是groovy的新手,我试图将闭包作为参数传递给方法,下面是我的代码,我使用的是Groovy 2.4
class Test
{
def testMethod()
{
def cl = {a,b -> println "a = "+${a}+" b = "+${b}}
testClosure(cl);
}
def testClosure(closure)
{
closure(5,2);
}
}
当我尝试执行它时,我得到以下异常,
Caught: groovy.lang.MissingMethodException: No signature of method:
com.gr.practice.Test.$() is applicable for argument types:
(com.gr.practice.Test$_testMethod_closure1$_closure2) values:
[com.gr.practice.Test$_testMethod_closure1$_closure2@3e92efc3]
Possible solutions:
is(java.lang.Object),
any(),
any(groovy.lang.Closure),
use([Ljava.lang.Object;),
wait(),
dump()
groovy.lang.MissingMethodException: No signature of method:
com.gr.practice.Test.$() is applicable for argument types:
(com.gr.practice.Test$_testMethod_closure1$_closure2) values:
[com.gr.practice.Test$_testMethod_closure1$_closure2@3e92efc3]
Possible solutions:
is(java.lang.Object),
any(),
any(groovy.lang.Closure),
use([Ljava.lang.Object;),
wait(),
dump()
at com.gr.practice.Test$_testMethod_closure1.doCall(Test.groovy:10)
at com.gr.practice.Test.testClosure(Test.groovy:16)
at com.gr.practice.Test$testClosure$0.callCurrent(Unknown Source)
at com.gr.practice.Test.testMethod(Test.groovy:11)
at com.gr.practice.Test$testMethod.call(Unknown Source)
at com.gr.practice.main.run(main.groovy:7)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
有人可以帮忙吗?
答案 0 :(得分:1)
您的问题是println "a = "+${a}+" b = "+${b}
。你可能想要这个:
println "a = ${a} b = ${b}"
或者:
println "a = " + a + " b = " + b
(前者是个更好的主意)