Ever heard of the namespace or class System in various programming languages?? In this post i will show you the description and definition of class System in some of the major languages. Although you may find the package system in many other languages. Some majors like .net framework have system in all the languages they support.

System inJAVA

java.lang.Object

|_extended byjava.lang.System public final class System extends Object

The System class contains several useful class fields and methods. It cannot be instantiated. Among the facilities provided by the System class are standard input, standard output, and error output streams; access to externally defined “properties”; a means of loading files and libraries; and a utility method for quickly copying a portion of an array. The 3 streams System.in, System.out, and System.err are also common sources or destinations of data. Most commonly used is probably System.out for writing output to the console from console programs. These 3 streams are initialized by the Java runtime when a JVM starts up, so you don’t have to instantiate any streams yourself (although you can exchange them at runtime). System.in System.in is an InputStream which is typically connected to keyboard input of console programs. System.in is not used as often since data is commonly passed to a command line Java application via command line arguments, or configuration files.

In applications with GUI the input to the application is given via the GUI. This is a separate input mechanism from Java IO. System in C++ System command execution Invokes the command processor to execute a command. Once the command execution has terminated, the processor gives the control back to the program, returning an int value, whose interpretation is system-dependent. The function call also be used with NULL as argument to check whether a command processor exists. Parameters command C string containing the system command to be executed in your program. Return Value The value returned when the argument passed is not NULL, depends on the running environment specifications. In many systems, 0 is used to indicate that the command was succesfully executed and other values to indicate some sort of error. When the argument passed is NULL, the function returns a nonzero value if the command processor is available, and zero otherwise.

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