groovy - 每个闭包的常规多重分配失败

Question

为什么这个 groovy 代码

def versionString = '10.15.20'
int major
int minor
int patch
(major, minor, patch) = versionString.split(/\./).each { Integer.parseInt(it) }
println "$major.$minor.$patch"

抛出这个异常

Caught: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object '10' with class 'java.lang.String' to class 'int'
org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object '10' with class 'java.lang.String' to class 'int'

而不是显示 10.15.20？

即为什么变量分配有 split() 的输出而不是闭包的输出？

Answer 1

你需要collect

(major, minor, patch) = versionString.split(/\./).collect { Integer.parseInt(it) }