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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.util.stream.*;
  5. import java.lang.*;
  6. import java.io.*;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. public class Main
  10. {
  11. 	public static void main (String[] args) throws java.lang.Exception
  12. 	{
  13. 		List<Order> orderList = new ArrayList<Order>();
  14. 	    List<Shipment> shipmentList = new ArrayList<Shipment>();
  15. 	    List<Item> itemList = new ArrayList<Item>();
  16.  
  17. 	    Shipment shipment = new Shipment();
  18. 	    shipment.setItem(itemList);
  19. 	    shipmentList.add(shipment);
  20.  
  21. 	    Order order = new Order();
  22. 	    order.setShipment(shipmentList);
  23. 	    orderList.add(order);
  24.  
  25. 	    List<Shipment> shipmentList2 = new ArrayList<Shipment>();
  26. 	    List<Item> itemList2 = new ArrayList<Item>();
  27.  
  28. 	    Shipment shipment2 = new Shipment();
  29. 	    shipment2.setItem(itemList2);
  30. 	    shipmentList2.add(shipment2);
  31.  
  32. 	    Order order2 = new Order();
  33. 	    order2.setShipment(shipmentList2);
  34. 	    orderList.add(order2);
  35.  
  36. 	    List<Shipment> shipmentList3 = new ArrayList<Shipment>();
  37. 	    List<Item> itemList3 = new ArrayList<Item>();
  38.  
  39. 	    Shipment shipment3 = new Shipment();
  40. 	    shipment3.setItem(itemList3);
  41. 	    shipmentList3.add(shipment3);
  42.  
  43. 	    Order order3 = new Order();
  44. 	    order3.setShipment(shipmentList3);
  45. 	    orderList.add(order3);
  46.  
  47. 	    Item item = new Item();
  48. 	    Item item1 = new Item();
  49. 	    Item item2 = new Item();
  50. 	    Item item3 = new Item();
  51. 	    Item item4 = new Item();
  52. 	    Item item5 = new Item();
  53. 	    Item item6 = new Item();
  54. 	    Item item7 = new Item();
  55.  
  56. 	    Product product = new Product();
  57. 	    product.setName("Mobile");
  58. 	    Product product1 = new Product();
  59. 	    product1.setName("Mobile");
  60. 	    Product product2 = new Product();
  61. 	    product2.setName("Tv");
  62. 	    Product product3 = new Product();
  63. 	    product3.setName("AC");
  64. 	    Product product4 = new Product();
  65. 	    product4.setName("Tab");
  66. 	    Product product5 = new Product();
  67. 	    product5.setName("Bike");
  68. 	    Product product6 = new Product();
  69. 	    product6.setName("Bike");
  70. 	    Product product7 = new Product();
  71. 	    product7.setName("Bike");
  72.  
  73. 	    item.setProduct(product);
  74. 	    item1.setProduct(product1);
  75. 	    item2.setProduct(product2);
  76. 	    item3.setProduct(product3);
  77. 	    item4.setProduct(product4);
  78. 	    item5.setProduct(product5);
  79. 	    item6.setProduct(product7);
  80. 	    item7.setProduct(product7);
  81.  
  82. 	    itemList.add(item);
  83. 	    itemList2.add(item1);
  84. 	    itemList2.add(item2);
  85. 	    itemList3.add(item3);
  86. 	    itemList3.add(item4);
  87. 	    itemList2.add(item5);
  88. 	    itemList3.add(item6);
  89. 	    itemList.add(item7);
  90.  
  91. 	    orderList.forEach(System.out::println);
  92. 	    System.out.println("-----------");
  93.  
  94. 	    List<Order> filteredOrders = orderList.stream()
  95.         .filter(o -> o.getShipment().stream()
  96.                 .flatMap(s -> s.getItem().stream()) // stream of Item
  97.                 .map(i -> i.getProduct().getName()) // stream of product
  98.                 //.map(Product::getName) // stream of product names
  99.                 .anyMatch("Mobile"::equals)
  100.         )
  101.         .collect(Collectors.toList()); 
  102.  
  103.         filteredOrders.forEach(System.out::println);
  104. 	}
  105. }
  106.  
  107. class Order {
  108.  
  109.     private List<Shipment> shipment;
  110.  
  111.     public List<Shipment> getShipment() {
  112.         return shipment;
  113.     }
  114.  
  115.     public void setShipment(List<Shipment> shipment) {
  116.         this.shipment = shipment;
  117.     }
  118.     @Override
  119.     public String toString() {
  120.     	return "order: shipments=" + shipment;
  121.     }
  122. }
  123.  
  124. class Shipment {
  125.  
  126.     private List<Item> item;
  127.  
  128.     public List<Item> getItem() {
  129.         return item;
  130.     }
  131.  
  132.     public void setItem(List<Item> item) {
  133.         this.item = item;
  134.     }
  135.  
  136.     @Override
  137.     public String toString() {
  138.     	return "items=" + item;
  139.     }
  140. }
  141.  
  142. class Item {
  143.  
  144.     private Product product;
  145.  
  146.     public Product getProduct() {
  147.         return product;
  148.     }
  149.  
  150.     public void setProduct(Product product) {
  151.         this.product = product;
  152.     }
  153.  
  154.     @Override
  155.     public String toString() {
  156.     	return ":product=" + product;
  157.     }
  158. }
  159.  
  160. class Product {
  161.  
  162.         private String name;
  163.  
  164.         public String getName() {
  165.             return name;
  166.         }
  167.  
  168.         public void setName(String name) {
  169.             this.name = name;
  170.         }
  171.  
  172.     @Override
  173.     public String toString() {
  174.     	return "product.name=" + name;
  175.     }    
  176. }
Success #stdin #stdout 0.11s 36800KB
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stdout
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order: shipments=[items=[:product=product.name=Mobile, :product=product.name=Bike]]
order: shipments=[items=[:product=product.name=Mobile, :product=product.name=Tv, :product=product.name=Bike]]
order: shipments=[items=[:product=product.name=AC, :product=product.name=Tab, :product=product.name=Bike]]
-----------
order: shipments=[items=[:product=product.name=Mobile, :product=product.name=Bike]]
order: shipments=[items=[:product=product.name=Mobile, :product=product.name=Tv, :product=product.name=Bike]]
https://ideone.com/aSWJL4
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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