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* to core-java-lang: * https://www.baeldung.com/java-stack-overflow-error * https://www.baeldung.com/java-new-custom-exception * https://www.baeldung.com/java-exceptions * https://www.baeldung.com/java-final-finally-finalize * https://www.baeldung.com/java-static-dynamic-binding * https://www.baeldung.com/java-throw-throws * https://www.baeldung.com/java-synthetic * https://www.baeldung.com/java-switch * https://www.baeldung.com/modulo-java * https://www.baeldung.com/java-ternary-operator