THE TUTORIAL LIBRARY
In this article I will explain how to develop a simple port scanner which you can use to scan a host for open ports. A port scanner is a software tool used by network administrator
Read tutorialThe processing of text often consists of parsing a formatted input string. Parsing is the division of text into a set of discrete parts, or tokens, which in a certain sequence can
Read tutorialBefore you can access a collection through an iterator, you must obtain one. Each of the collection classes provides an iterator() method that returns an iterator to the start of t
Read tutorialThe ArrayList class extends AbstractList and implements the List interface. ArrayList supports dynamic arrays that can grow as needed. In Java, standard arrays are of a fixed lengt
Read tutorialThread groups offer a convenient way to manage groups of threads as a unit. This is particularly valuable in situations in which you want to suspend and resume a number of related
Read tutorialIn safe environments, you can use Java to execute other heavyweight processes (that is, programs) on your multitasking operating system. Several forms of the exec() method allow yo
Read tutorialAlthough Java provides automatic garbage collection, sometimes you will want to know how large the object heap is and how much of it is left. You can use this information, for exam
Read tutorialOne of the most common programming chores is converting the string representation of a number into its internal, binary format. Fortunately, Java provides an easy way to accomplish
Read tutorialFloat and Double provide the methods isInfinite() and isNaN(), which help when manipulating two special double and float values. These methods test for two unique values defined by
Read tutorialThe method toLowerCase() converts all the characters in a string from uppercase to lowercase. The toUpperCase() method converts all the characters in a string from lowercase to upp
Read tutorialThe valueOf() method converts data from its internal format into a human-readable form. It is a static method that is overloaded within String for all of Java's built-in types, so
Read tutorialYou can extract a substring using substring(). It has two forms.
Read tutorialOne example today. A better developer tomorrow.