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Could not solve on my own - come back to review later https://www.hackerrank.com/challenges/java-factory/problem?

Hackerrank Java OOP section: https://www.hackerrank.com/challenges/java-interface/problem?isFullScreen=true.

Hackerrank Java OOP section: (Could not solve on my own - come back to review later) ...

Could not solve on my own (come back to review later) https://www.hackerrank.com/challenges/java-iterator/problem?

Hackerrank Java OOP section: https://www.hackerrank.com/challenges/java-method-overriding/problem?isFullScreen=true.

Could not solve on my own (come back to review later) https://www.hackerrank.com/challenges/java-singleton/problem?

Java Hackerrank OOP Section: (Could not solve on my own - come back to review later) ...