I have the following Data as list of String[] in java, is it possible to convert using the stream().map() ? This is an example of the List.


	














    

		

        

            
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首页  > 解决方案 > How to convert List to List using modelmapper or stream().map()?

I have the following Data as list of String[] in java, is it possible to convert using the stream().map() ? This is an example of the List.














java - How to convert List to List using modelmapper or stream().map()?

I have the following Data as list of String[] in java, is it possible to convert using the stream().map() ? This is an example of the List.








问题描述



I have the following Data as list of String[] in java, is it possible to convert using the stream().map() ? This is an example of the List.


Data's type is List<String[]> data which contains the following structure:
["a","b","c","d"],
["e","f","g","e"],
["e","f","g","e"]



I was trying to map my values with the modelMapper and without modelMapper and the data is empty:


List<Custom> mapInfo = new ArrayList<CustomData>();
mapInfo=data.stream().map(objectModel -> modelMapper.map(objectModel, CustomData.class)).collector(Collectors.toList());



However when i try to use the data, the object structure is empty on every object of the array:


 @Getter
 @Setter
 @Builder
 @NoArgsConstructor
 @AllArgsConstructor
 public class CustomData(){
   @Builder.Default
   private String valueA="";
   @Builder.Default
   private String valueB="";
   @Builder.Default
   private String valueC="";
   @Builder.Default
   private String valueD="";
}










Since you have all arguments constructor for class CustomData you can do something like this


    data.stream()
        .map(row -> new CustomData(row[0], row[1], row[2], row[3]))
        .collect(Collectors.toList());



标签： javajava-streamlombokmodelmapper


解决方案









因为你有类的所有参数构造函数，CustomData你可以做这样的事情


    data.stream()
        .map(row -> new CustomData(row[0], row[1], row[2], row[3]))
        .collect(Collectors.toList());











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