Pergunta de entrevista da empresa SAP

What is memory leak? how is the JVM memory structured? Perm Gen and Java 8 Metaspace details. Explained different algo of garbage collection also the latest ones (Garbage F1) Is there any issue if you have a method in a class credentials(String username, String password)? Create a Point immutable class. Write a code for converting input number into words (input between 1-999).