nojronatron / java-generics-practice

Follow documented methods to create and utilize generics in Java.

GenericsPractice Project

Following the Oracle Java Docs Q and E, create code and tests that will validate learnings and answer ending Quiz questions.

Takeaways

• An array is denoted by [] following a Type, which can be any primitive or Class: Integer[] india = {1,2,3,} is functionally similar to int[] india = {1,2,3,} but probably takes more memory storage.
• The Java class Arrays is a functional class that help work with Array types and Lists.
• The Java class Array has static methods used to create and access Java arrays.
• List<E> is a Collection Interface that extends Iterable<E>. Brackets [] array does not have these interface features.
• ArrayList<E> implements List<E> and is a fully instantiatable Class. Should not be confused with brackets [] arrays.
• Generic functions do not require a containing class to be generic! Use public static <T> void setMethod(){} to set the method with a generic type placeholder.
• Leveraging wildcard ? can be tricky due to inheritance, and there are situations where using it will cause problems during run time.

Resources

Oracle's Java Tutorials

Baeldung: Java Generics

Baeldung: Comparing Objects in Java