java populate hashmap code example
Example 1: java 11 initialize map
Map emptyMap = Map.of();
Map singletonMap = Map.of("key1", "value");
Map map = Map.of("key1","value1", "key2", "value2");
Example 2: define hashmap and pre set value
private static final Map m = new HashMap() {{
put("RC", "T1");
put("AC", "T1");
}};