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* to core-java-lang: * https://www.baeldung.com/java-lang-system * https://www.baeldung.com/java-type-erasure * https://www.baeldung.com/java-assert * https://www.baeldung.com/java-pass-by-value-or-pass-by-reference * https://www.baeldung.com/java-variable-method-hiding * https://www.baeldung.com/java-access-modifiers * https://www.baeldung.com/java-super * https://www.baeldung.com/java-this * https://www.baeldung.com/java-immutable-object * https://www.baeldung.com/java-classnotfoundexception-and-noclassdeffounderror * https://www.baeldung.com/infinite-loops-java (changes for this were included in commit 1, with other loop-related examples)