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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.ArrayList;
  4. import java.util.List;
  5. import java.util.stream.Collectors;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		List<DetailedData> data = getList();
  13.  
  14. 		List<DetailedData> temp = data.stream()
  15. 			.collect(Collectors.groupingBy(DetailedData::getModel))
  16. 			.values().stream()
  17. 			.map(DetailedData::merge)
  18. 			.collect(Collectors.toList());			
  19.  
  20. 		temp.forEach(System.out::println);
  21. 	}
  22.  
  23. 	public static List<DetailedData> getList() {
  24. 		List<DetailedData> ret = new ArrayList<>();
  25.  
  26. 		ret.add(new DetailedData("dell", "inspiron 15-R", "laptop", "Header", "9j4AAQSk", null));
  27. 		ret.add(new DetailedData("dell", "inspiron 15-R", "laptop", "Thumbnail", "iVBORw0KGg", null));
  28. 		ret.add(new DetailedData("apple", "macbook air", "laptop", "Header", "9j4AAQSk", null));
  29. 		ret.add(new DetailedData("apple", "macbook air", "laptop", "Thumbnail", "iVBORw0KGg", null));
  30. 		ret.add(new DetailedData("dell", "xps 13", "laptop", "Header", "9j4AAQSk", null));
  31.  
  32. 		return ret;
  33. 	}
  34. }
  35.  
  36. class DetailedData {
  37. 	String Company;
  38.     String Model;
  39.     String Category;
  40.     String ImageType;
  41.     String ImageBuffer1;
  42.     String ImageBuffer2;
  43.  
  44.     public DetailedData(String company, String model, String category, String imageType, String imageBuffer1,
  45. 			String imageBuffer2) {
  46. 		super();
  47. 		Company = company;
  48. 		Model = model;
  49. 		Category = category;
  50. 		ImageType = imageType;
  51. 		ImageBuffer1 = imageBuffer1;
  52. 		ImageBuffer2 = imageBuffer2;
  53. 	}
  54.  
  55.     public static DetailedData merge(List<DetailedData> list) {
  56. 		if(list.isEmpty()) // Not possible after 'groupingBy'.
  57.     		return null;
  58.  
  59.     	if(list.size() == 1)
  60.     		return list.get(0);
  61.  
  62. 		// At least 2 elements:
  63.     	DetailedData ret = list.get(0);
  64.     	ret.ImageBuffer2 = list.get(1).ImageBuffer1;
  65.     	return ret;
  66. 	}
  67.  
  68. 	public String getModel() {
  69.     	return Model;
  70.     }
  71.  
  72.     public String getImageType() {
  73.     	return ImageType;
  74.     }
  75.  
  76.     @Override
  77.     public String toString() {
  78.     	return String.join(", ", Company, Model, Category, ImageType, ImageBuffer1, ImageBuffer2);
  79.     }
  80. }
Success #stdin #stdout 0.21s 320960KB
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stdin
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Standard input is empty
stdout
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dell, xps 13, laptop, Header, 9j4AAQSk, null
dell, inspiron 15-R, laptop, Header, 9j4AAQSk, iVBORw0KGg
apple, macbook air, laptop, Header, 9j4AAQSk, iVBORw0KGg
https://ideone.com/FHKWAg
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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