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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.ArrayList;
  4. import java.util.Arrays;
  5. import java.util.Collection;
  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) {
  11.  
  12.         Collection<Entity> first = new ArrayList<>(Arrays.asList(new Entity("id_1", 1),
  13.                 new Entity("id_1", 2), new Entity("id_1", 3)));
  14.  
  15.         Collection<Entity> second = new ArrayList<>(Arrays.asList(new Entity("id_2", 3),
  16.                 new Entity("id_2", 4), new Entity("id_2", 5)));
  17.  
  18.         second.forEach(entity -> first.removeIf(t -> t.getId() == entity.getId()));
  19.         first.addAll(second);
  20.  
  21.         System.out.println(first);
  22.     }
  23. }
  24.  
  25. class Entity {
  26.  
  27.     private String name;
  28.     private long id;
  29.  
  30.     public Entity(String name, long id) {
  31.         this.name = name;
  32.         this.id = id;
  33.     }
  34.  
  35.     public Entity() {
  36.     }
  37.  
  38.     public long getId() {
  39.         return id;
  40.     }
  41.  
  42.     public void setId(long id) {
  43.         this.id = id;
  44.     }
  45.  
  46.     public String getName() {
  47.         return name;
  48.     }
  49.  
  50.     public void setName(String name) {
  51.         this.name = name;
  52.     }
  53.  
  54.     @Override
  55.     public String toString() {
  56.         return "Entity{" + "name=" + name + ", id=" + id + '}';
  57.     }
  58.  
  59. }
  60.  
Success #stdin #stdout 0.22s 33308KB
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Standard input is empty
stdout
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[Entity{name=id_1, id=1}, Entity{name=id_1, id=2}, Entity{name=id_2, id=3}, Entity{name=id_2, id=4}, Entity{name=id_2, id=5}]
https://ideone.com/vArGRC
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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