groovy的错误

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1.Cannot cast object 'org.codehaus.groovy.runtime.MethodClosure@92d6d2' with class 'org.codehaus.groovy.runtime.MethodClosure' to class 'Closure'

class MethodClosureSample {int limitpublic MethodClosureSample(int limit) {this.limit = limit}boolean validate(String value){return value.length() <= limit}static main(args) {MethodClosureSample first = new MethodClosureSample(6)MethodClosureSample second = new MethodClosureSample(5)Closure firstClosure = first.&validatedef words = ['long string','medium','short','tiny']assert 'medium' == words.find(firstClosure)assert 'short' == words.find(second.&validate)}}

如上代码改成如下的形式：

class MethodClosureSample {int limitpublic MethodClosureSample(int limit) {this.limit = limit}boolean validate(String value){return value.length() <= limit}static main(args) {MethodClosureSample first = new MethodClosureSample(6)MethodClosureSample second = new MethodClosureSample(5)org.codehaus.groovy.runtime.MethodClosure firstClosure = first.&validatedef words = ['long string','medium','short','tiny']assert 'medium' == words.find(firstClosure)assert 'short' == words.find(second.&validate)}}