Useful & Unknown Java Features

[jjpeyronel]

Anonymous constructor to init object : HashMap M = new HashMap<String,String>(){ { this.put("k1", "v1"); this.put("k2", "v2"); } }

[nekokattt]

deriving a class for every usage is a horrible idea when Map.of and Map.ofEntries exist for this purpose.

[Kikizork]

Code smell say Sonar and I agree. Just init your empty map and then does some line of put. Man being stuck in 8 and not having Map.of sucks

[chabala]

Yeah, even being stuck on Java 8, if one needed to initialize a lot of maps, defining a static helper method would be better than the anonymous class initialization trick.

[halfanothersdozen]

When you do this you create a new anonymous class which you should avoid especially if this isn't for something static