如何使用 groovy 在另一个数组的元素中添加数组答案

【问题标题】：how to add array in another array's element using groovy如何使用 groovy 在另一个数组的元素中添加数组
【发布时间】：2022-12-14 00:55:56
【问题描述】：

我有一个数组列表数组，我正在尝试使用 groovy 构建它，但没有得到预期的结果，我使用 putALL 方法添加一个数组，但它覆盖了以前的数组，

我试过这种方式，输出是这个[parent:health, children:[true]]

        import java.util.stream.Collectors

        def fakeList = [
                        [coverageType: 'health', amount: 9, expireDate: 2020], 
                        [coverageType: 'insurance', amount: 10, expireDate: 2020], 
                        [coverageType: 'health', amount: 9, expireDate: 2021],
                    ] 

        def groupList = [:]
        def list = fakeList
                .stream()
                .map { item -> 
                        def parentWithChilds = [
                                parent: item.coverageType,
                                child: groupList.stream()
                                .map { list -> list?.parent !== item.coverageType }
                                .collect(Collectors.toList())
                            ]
                            groupList.putAll(parentWithChilds)
                    }.collect(java.util.stream.Collectors.toList())

我的目标是，如果数组中有任何相同的 coverageType 值，我会将它们添加到子列表中，

这是我的预期输出：

          [     parent: 'health',
                children: [
                    [
                    coverageType: 'health',
                    amount:'9',
                    expireDate: '2020'                        
                    ],
                    [
                    coverageType: 'health',
                    amount:'9',
                    expireDate: '2021'                        
                    ],
                ]
            ],
            [
                parent: 'insurance',
                children: [
                    [
                    coverageType: 'insurance',
                    amount: '9',
                    expireDate: '2020'                        
                    ]
                ]
            ],

或者没有钥匙：

  [     parent: 'health',
                    children: [
                        [
                        'health',
                        '9',
                        '2020'                        
                        ],
                        [
                        'health',
                        '9',
                        '2021'                        
                        ],
                    ]
                ],
                [
                    parent: 'insurance',
                    children: [
                        [
                        'insurance',
                        '9',
                        '2020'                        
                        ]
                    ]
                ],

【问题讨论】：

标签： java groovy

【解决方案1】：

鉴于这种：

def fakeList = [
                [coverageType: 'health', amount: 9, expireDate: 2020], 
                [coverageType: 'insurance', amount: 10, expireDate: 2020], 
                [coverageType: 'health', amount: 9, expireDate: 2021],
            ]

考虑一下：

def groupList = fakeList.groupBy { it.coverageType }
                        .collect { coverageType, items ->
        def map = [:]
        map.'parent' = coverageType 
        map.'childs' = items.collect { item ->
            def childMap = [:]
            childMap.'coverage' = coverageType
            childMap.'amount' = item.amount as String
            childMap.'expireDate' = item.expireDate as String
            childMap
        }
        map
}

生成的地图是：

[
[parent:health, childs:[[coverage:health, amount:9, expireDate:2020], [coverage:health, amount:9, expireDate:2021]]],
[parent:insurance, childs:[[coverage:insurance, amount:10, expireDate:2020]]]
]

工作示例列出了here，它也转换为 JSON 以进行漂亮的打印。

【讨论】：