我正在尝试在 Groovy 中对以 map 为值的 map 进行排序。我想遍历 map 并打印出按 lastName 和 firstName 值排序的值。所以在下面的例子中:
def m =
[1:[firstName:'John', lastName:'Smith', email:'john@john.com'],
2:[firstName:'Amy', lastName:'Madigan', email:'amy@amy.com'],
3:[firstName:'Lucy', lastName:'B', email:'lucy@lucy.com'],
4:[firstName:'Ella', lastName:'B', email:'ella@ella.com'],
5:[firstName:'Pete', lastName:'Dog', email:'pete@dog.com']]
预期的结果是:
[firstName:'Ella', lastName:'B', email:'ella@ella.com']
[firstName:'Lucy', lastName:'B', email:'lucy@lucy.com']
[firstName:'Pete', lastName:'Dog', email:'pete@dog.com']
[firstName:'Amy', lastName:'Madigan', email:'amy@amy.com']
[firstName:'John', lastName:'Smith', email:'john@john.com']
我试过 m.sort{it.value.lastName&&it.value.firstName} 和 m.sort{[it.value.lastName, it.value.firstName]}。按 m.sort{it.value.lastName} 排序有效,但不能按 firstName 排序。
哪位大神可以帮忙解答一下,不胜感激,谢谢!
最佳答案
这应该这样做:
m.values().sort { a, b ->
a.lastName <=> b.lastName ?: a.firstName <=> b.firstName
}
关于按值对 map 内的 map 进行排序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10131759/