Java2007-09-07
Using One-Dimensional Arrays in Java
A one-dimensional array is, essentially, a list of like-typed variables. To create an array, you first must create an array variable of the desired type. The general form of a one-
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Java2007-09-07
how to use boolean data type in Java
Java has a simple type, called boolean, for logical values. It can have only one of two possible values, true or false. This is the type returned by all relational operators, such
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char data type in Java
In Java, the data type used to store characters is char. However, C/C++ programmers beware: char in Java is not the same as char in C or C++. In C/C++, char is an integer type that
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float vs double data types in Java
Floating-point numbers, also known as real numbers, are used when evaluating expressions that require fractional precision. For example, calculations such as square root, or transc
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Integer: byte, short, int, and long data types in Java
Java defines four integer types: byte, short, int, and long. All of these are signed, positive and negative values. Java does not support unsigned, positive-only integers. Many oth
Read tutorialJava2007-09-03
Simple Port Scanner application using Java
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
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Java2007-09-02
Using StringTokenizer in Java
The 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
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How to use Iterator in Java
Before 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
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How to use ArrayList in Java
The 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
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ThreadGroup Sample in Java
Thread 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
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Executing other system commands and programs from a Java Program
In 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
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Using totalMemory() and freeMemory() in Java
Although 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
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