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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("id1", 1),
  13.                 new Entity("id1", 2), new Entity("id1", 3)));
  14.  
  15.         Collection<Entity> second = new ArrayList<>(Arrays.asList(new Entity("id2", 3),
  16.                 new Entity("id2", 4), new Entity("id2", 5)));
  17.  
  18.         first.forEach(entity -> {
  19.             if (second.contains(entity)) {
  20.                 second.remove(entity);
  21.             }
  22.         });
  23.         second.addAll(first);
  24.         System.out.println(second);
  25.     }
  26. }
  27.  
  28. class Entity {
  29.  
  30.     String name;
  31.     long id;
  32.  
  33.     public Entity(String name, long id) {
  34.         this.name = name;
  35.         this.id = id;
  36.     }
  37.  
  38.     public Entity() {
  39.     }
  40.  
  41.     public long getId() {
  42.         return id;
  43.     }
  44.  
  45.     public void setId(long id) {
  46.         this.id = id;
  47.     }
  48.  
  49.     public String getName() {
  50.         return name;
  51.     }
  52.  
  53.     public void setName(String name) {
  54.         this.name = name;
  55.     }
  56.  
  57.     @Override
  58.     public int hashCode() {
  59.         int hash = 7;
  60.         hash = 59 * hash + (int) (this.id ^ (this.id >>> 32));
  61.         return hash;
  62.     }
  63.  
  64.     @Override
  65.     public boolean equals(Object obj) {
  66.         if (this == obj) {
  67.             return true;
  68.         }
  69.         if (obj == null) {
  70.             return false;
  71.         }
  72.         if (getClass() != obj.getClass()) {
  73.             return false;
  74.         }
  75.         final Entity other = (Entity) obj;
  76.         if (this.id != other.id) {
  77.             return false;
  78.         }
  79.         return true;
  80.     }
  81.  
  82.     @Override
  83.     public String toString() {
  84.         return "Entity{" + "name=" + name + ", id=" + id + '}';
  85.     }
  86.  
  87. }
  88.  
Success #stdin #stdout 0.14s 33332KB
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Standard input is empty
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[Entity{name=id2, id=4}, Entity{name=id2, id=5}, Entity{name=id1, id=1}, Entity{name=id1, id=2}, Entity{name=id1, id=3}]
https://ideone.com/sdV05O
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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