fork(2) download
copy 
  1. import java.util.*;
  2. import java.io.*;
  3. import java.util.stream.*;
  4. class Ideone
  5. {
  6. 	public static void main(String[] args) {
  7.         Map<String, Set<String>> map1 = new HashMap<>();
  8.         Set<String> set1 = new HashSet<>();
  9.         set1.add("AB");
  10.         set1.add("BC");
  11.         map1.put("ABCD", set1);
  12.         Map<String, Set<String>> map2 = new HashMap<>();
  13.         Set<String> set2 = new HashSet<>();
  14.         set2.add("CD");
  15.         set2.add("EF");
  16.         map2.put("ABCD", set2);
  17.         final Map<String, Set<String>> map3 = Stream.concat(map1.entrySet().stream(), map2.entrySet().stream())
  18.                 .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue,
  19.                         (a, b) -> Stream.concat(a.stream(), b.stream()).collect(Collectors.toSet())));
  20.         System.out.println(map3);
  21.     }
  22. }
Success #stdin #stdout 0.08s 34216KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
{ABCD=[AB, BC, CD, EF]}
https://ideone.com/sIN7ow
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!