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More on reddit.com

It's a lot better than it once was, many years ago. Back in the day, you could find bad or wrong advice on many/most of their pages. Hell, the way it used to teach PHP database querying was pretty much a recipe to open yourself up to SQL Injection attacks. Now, it's at least correct, even where it's not very deep. But I'll never get over my mistrust of them from the past. Also, W3Schools has zero connection to the W3C , which the name is clearly meant to imply. Lots of shitty, shady sites use "W3" in their name to try to make you think they're more official than they are. Whether this is what W3Schools tried to do, I don't know, but I don't like it. The best source for web documentation is Mozilla Dev Network . This is almost always more complete and more authoritative than W3Schools. More on reddit.com

Sounds very useful, good post. More on reddit.com

The first one is using type inference . See the section labeled "Type Inference and Instantiation of Generic Classes" for specific details on this kind of type inference. The point is, they are both the same thing. The second one is the more traditional way to write it, and was the only correct way to write it before type inference was added to Java. But the first one is the way to write the same thing with less total code. In the end, both of the map variables would be HashMap variables; the first way is just a more efficient way to write it out. More on reddit.com