Java2007-09-14
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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Java2007-09-14
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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The TreeSet Class in Java
TreeSet provides an implementation of the Set interface that uses a tree for storage. Objects are stored in sorted, ascending order. Access and retrieval times are quite fast, whic
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3-D Secure Payment or 3DS - (3-Domain Secure Payment)
A 3-D Secure transaction is performed immediately before a merchant performs a payment transaction, that is, Authorisation transaction in the Auth/Capture mode; and the Purchase tr
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What are e-Payments?
e-Payments are secure real time payments that transfer funds (via the Internet) between a consumer and the merchant's financial institutions. e-Payments require secure communicatio
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Java2007-09-12
HashSet Sample program in Java
HashSet extends AbstractSet and implements the Set interface. It creates a collection that uses a hash table for storage. As most readers likely know, a hash table stores informati
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LinkedList Sample program in Java
The LinkedList class extends AbstractSequentialList and implements the List interface. It provides a linked-list data structure. It has the two constructors, shown here:
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toRadians() and toDegrees() Sample program in Java
The toRadians() method converts degrees to radians. toDegrees() converts radians to degrees. Here is a program that demonstrates toRadians() and toDegrees():
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getClass() and getSuperclass() in Java
The following program demonstrates getClass() (inherited from Object) and getSuperclass() (from Class):
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clone() and the Cloneable Interface in Java
Most of the methods defined by Object are discussed elsewhere in this book. However, one deserves special attention: clone(). The clone() method generates a duplicate copy of the o
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arraycopy() in Java
The arraycopy() method can be used to copy quickly an array of any type from one place to another. This is much faster than the equivalent loop written out longhand in Java. Here i
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