The above class runs through several popular Map implementations (EnumMap, HashMap, LinkedHashMap, TreeMap, Hashtable, WeakHashMap, ConcurrentHashMap) and prints out whether each Map ...

Abstract and Nested Classes - 23m Practice 5-1: Applying the Abstract Keyword - 14m Practice 5-2: Implementing Inner Class as a Helper Class - 7m Practice 5-3: Using Java Enumerations - 11m Skill ...

As the previous two code snippets above and the associated images show, the Java compiler introduces synthetic methods on an as-needed basis. When only one of the nested class’s private ...

Java Enums can be thought of as classes which have a fixed set of constants (a variable that does not change). The Java enum constants are static and final implicitly. It is available since JDK 1.5.