Java2007-09-14
Calendar - sample program in Java
The 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
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Java2007-09-14
BitSet example in Java
A 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
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store() and load() example in Java
One 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
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Properties example in Java
Properties 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
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Hashtable example in Java
Hashtable 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.
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Stack example in Java - push(), pop(), empty(), search()
Stack 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
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Java2007-09-14
Vector example in Java
Vector 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
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Arrays example in Java - asList(), binarySearch(), fill(), sort(), equals()
Java 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
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compare() example in Java
The 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
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TreeMap example in Java
The TreeMap class implements the Map interface by using a tree. A TreeMap provides an efficient means of storing key/value pairs in sorted order, and allows rapid retrieval. You sh
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HashMap example in Java
The HashMap class uses a hash table to implement the Map interface. This allows the execution time of basic operations, such as get() and put(), to remain constant even for large s
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iterator() and hasNext() in Java
Before you can access a collection through an iterator, you must obtain one. Each of thecollection classes provides an iterator() method that returns an iterator to the start of th
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