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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.util.stream.Collectors;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. 	public static void main (String[] args) throws java.lang.Exception
  12. 	{
  13. 		List<Package> packageList = new ArrayList<>(List.of(
  14.                 new Package(13L, "Normal", new ArrayList<>(List.of(new Service(100L, "China")))),
  15.                 new Package(10L, "Full", new ArrayList<>(List.of(new Service(100L, "Spain")))),
  16.                 new Package(5L, "Full", new ArrayList<>(List.of(new Service(100L, "Japan"))))
  17.         ));
  18.  
  19.         HashMap<String, Object> stringObjectHashMap = new HashMap<>();
  20.         boolean isFound = packageList.stream()
  21.                 .filter(pack -> "Full".equalsIgnoreCase(pack.getPackageName()))
  22.                 .map(pack -> {
  23.                     stringObjectHashMap.put("packageId", pack.getPackageId());
  24.                     return pack;
  25.                 })
  26.                 .flatMap(pack -> pack.getServiceList().stream())
  27.                 .filter(service -> service.getLocation().equalsIgnoreCase("Japan"))
  28.                 .map(service -> {
  29.                     stringObjectHashMap.put("serviceId", service.getServiceId());
  30.                     return service;
  31.                 })
  32.                 .anyMatch(service -> service.getLocation().equalsIgnoreCase("Japan"));
  33.         System.out.println("isFound: " + isFound);
  34.  
  35.         Map<String, Long> mapRes = packageList.stream()
  36.                 .filter(pack -> pack.getPackageName().equalsIgnoreCase("Full") && pack.getServiceList().stream().anyMatch(s -> s.getLocation().equalsIgnoreCase("Japan")))
  37.                 .collect(Collectors.teeing(
  38.                         Collectors.toMap(p -> "packageId", Package::getPackageId, (id1, id2) -> id1),
  39.                         Collectors.flatMapping(pack -> pack.getServiceList().stream(), Collectors.toMap(s -> "serviceId", Service::getServiceId, (id1, id2) -> id1)),
  40.                         (map1, map2) -> {
  41.                             map1.putAll(map2);
  42.                             return map1;
  43.                         }));
  44.         boolean isFound2 = mapRes.entrySet().size() == 2;
  45.         System.out.println("\nMap: " + mapRes);
  46.         System.out.println("isFound: " + isFound2);
  47. 	}
  48.  
  49. 	static class Package {
  50.         Long packageId;
  51.         String packageName;
  52.         List<Service> serviceList;
  53.  
  54.         public Package(Long packageId, String packageName, List<Service> serviceList) {
  55.             this.packageId = packageId;
  56.             this.packageName = packageName;
  57.             this.serviceList = serviceList;
  58.         }
  59.  
  60.         public Long getPackageId() {
  61.             return packageId;
  62.         }
  63.  
  64.         public String getPackageName() {
  65.             return packageName;
  66.         }
  67.  
  68.         public List<Service> getServiceList() {
  69.             return serviceList;
  70.         }
  71.     }
  72.  
  73.     static class Service {
  74.         Long serviceId;
  75.         String location;
  76.  
  77.         public Service(Long serviceId, String location) {
  78.             this.serviceId = serviceId;
  79.             this.location = location;
  80.         }
  81.  
  82.         public Long getServiceId() {
  83.             return serviceId;
  84.         }
  85.  
  86.         public String getLocation() {
  87.             return location;
  88.         }
  89.     }
  90. }
Success #stdin #stdout 0.2s 55576KB
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Standard input is empty
stdout
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isFound: true

Map: {packageId=5, serviceId=100}
isFound: true
https://ideone.com/uV5PIQ
Collect Data From Both Nested List And Outer List Java Stream

https://stackoverflow.com/questions/72352454/collect-data-from-both-nested-list-and-outer-list-java-stream/
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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