Intellij idea run class with cursor

The small “play” symbols to the left on some classes can be run w/ <C-S-F10> if cursor is on them currently.

Java supports labels!

Java label? Outer, middle, inner - Stack Overflow

someLabel:
    for (i = 0; i < 100; i++) {
        for (j = 0; j < 100; j++) {
            if (i % 20 == 0) {
                break someLabel;
            }
        }
    }

Used to tell break/continue.. which loop to act on.

Random / style / writing

Calling your example classes as something that might be interpreted as a keyword of the language you are writing a tutorial about is a bad idea. (Outer here: Java Nested Classes)

Java collections

Java Collections Tutorial is a really nice tutorial by the author of the other java really nice tutorial I’ve been following.