A frequently asked question in a Java interview is: How to implement a Java HashMap? Java job seekers must fully grok this important concept if they want to ace the interview. The HashMap tutorial ...

java.lang.Object shell size in bytes: public static final int OBJECT_SHELL_SIZE = 8; public static final int OBJREF_SIZE = 4; public static final int LONG_FIELD_SIZE = 8; public static final int ...

Iterators in Java typically expect exclusive access to the data structure ... you should not use fail-safe iterators. The ArrayList and HashMap classes, have fail-fast iterators. The ...