groovy - Groovy 中的分组依据

Question

我有一个对象列表如下

[["GX 470","Model"],["Lexus","Make"],["Jeep","Make"],["Red","Color"],["blue","Color"]]

我想把它转换成

{"Model":["GX 470"],"Make":["Lexus","Jeep"],"Color":["Red", "blue"]}

我试过了

list.groupBy{ it[1] }

但这让我回归

{"Model":[["GX 470","Model"]],"Make":[["Lexus","Make"],["Jeep","Make"]],"Color":[["Red","Color"],["blue","Color"]]}

Answer 1

您可以将中间结果进一步转换为:

list.groupBy{ it[1] }.collectEntries{ k, v -> [(k):v*.get(0)] }