THE TUTORIAL LIBRARY
A directory is a File that contains a list of other files and directories. When you create a File object and it is a directory, the isDirectory() method will return true. In this c
Read tutorialAlthough most of the classes defined by java.io operate on streams, the File class does not. It deals directly with files and the file system. That is, the File class does not spec
Read tutorialThe Random class is a generator of pseudorandom numbers. These are called pseudorandom numbers because they are simply uniformly distributed sequences. Random defines the following
Read tutorialThe abstract Calendar class provides a set of methods that allows you to convert a time in milliseconds to a number of useful components. Some examples of the type of information t
Read tutorialA BitSet class creates a special type of array that holds bit values. This array can increase in size as needed. This makes it similar to a vector of bits. The BitSet constructors
Read tutorialOne of the most useful aspects of Properties is that the information contained in a Properties object can be easily stored to or loaded from disk with the store() and load() method
Read tutorialProperties is a subclass of Hashtable. It is used to maintain lists of values in which the key is a String and the value is also a String. The Properties class is used by many othe
Read tutorialHashtable was part of the original java.util and is a concrete implementation of a Dictionary. However, Java 2 reengineered Hashtable so that it also implements the Map interface.
Read tutorialStack is a subclass of Vector that implements a standard last-in, first-out stack. Stack only defines the default constructor, which creates an empty stack. Stack includes all the
Read tutorialVector implements a dynamic array. It is similar to ArrayList, but with two differences: Vector is synchronized, and it contains many legacy methods that are not part of the collec
Read tutorialJava 2 added a new class to java.util called Arrays. This class provides various methods that are useful when working with arrays. Although these methods technically aren't part of
Read tutorialThe following is an example that demonstrates the power of a custom comparator. It implements the compare() method so that it operates in reverse of normal. Thus, it causes a tree
Read tutorialOne example today. A better developer tomorrow.