java create map and add elements code example

Example 1: new hashmap java

Map<String, String> myMap = new HashMap<String, String>() {{
        put("a", "b");
        put("c", "d");
    }};

Example 2: java add to map

HashMap<String, String> map = new HashMap<>();
map.put("key", "value");

Example 3: java initialize map with values in one line

Map<String, Integer> map = Stream.of(
  new AbstractMap.SimpleImmutableEntry<>("idea", 1),    
  new AbstractMap.SimpleImmutableEntry<>("mobile", 2))
  .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));

Example 4: java add element to map

map.put(key, Object);
//exemple:
Map<String, String> map = new HashMap<String, String>();
map.put("mykey", "myvalue");