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I'm hoping to do a system by using java. In that, i need to capture a signal through a com or printer port. If anyone knows how to do this, please guide me. 
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I'm hoping to do a system by using java. In that, i need to capture a signal through a com or printer port. If anyone knows how to do this, please guide me. 

how to capture a signal through a com or a printer port by using java

A programming language is a formal constructed language designed to communicate instructions to a machine, particularly a computer. Thousands of different programming languages have been created, mainly in the computer field, and many more still are being created every year. The description of a programming language is usually split into the two components of syntax (form) and semantics (meaning). Some languages are defined by a specification document (for example, the C programming language is specified by an ISO Standard), while other languages (such as Perl) have a dominant implementation that is treated as a reference. Some languages have both, with the basic language defined by a standard and extensions taken from the dominant implementation being common.

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Programming includes both the specifics of the language you’re using, like Visual Basic, .NET, Java and others, but also the best practices in user experience and interfaces and the management of projects, version control and development. Other programming topics are related to web and cloud development and system and hardware programming.