I've been tasked with a building a Java cache toolkit with various ... The relevant parts of the code are: Code: private HashMap cache = new HashMap(); public Object get (Object key) throws ...

And by the way, just to give you an idea of the HashMap method -- uh, the hashCode method -- every time you create, um, an object in Java, each instance that you create gets assigned its own hashCode.

Java HashMap is similar to HashTable, but it is unsynchronized. It allows to store the null keys as well, but there should be only one null key object and there can be any number of null values. This ...

like the HashMap class, do not. The Java Stack interface represents a classical stack data structure, where elements can be pushed to last-in-first-out (LIFO) stack of objects. In Stack we push an ...