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Consider this Scanner input example.
Scanner user_input = new Scanner( System.in );
Here Scanner is the CLASS.
user_input is the OBJECT under Scanner class.
What is (System.in)? Is it a parameter passed or a object under Scanner class?.
Consider another example.
dog dog1 = new dog(25)
Here I have set dog class to accept size as a parameter.
What exactly is System.in?
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System.in provides the input stream from the keyboard and InputStreamReader reads the stream. Next, a BufferedReader object is instantiated with the InputStreamReader object passed to the constructor.
System.in is passed as a parameter in Scanner class. It tells the java compiler that system input will be provided through console(keyboard).
in. read(byte[]) System is a class in java. lang package. in is a static data member in the system class of type input stream class.
System.in is the input stream connected to the console, much as System. out is the output stream connected to the console. In Unix or C terms, System.in is stdin and can be redirected from a shell in the same fashion. System.in is the static in field of the java. lang.
Scanner class accepts input stream as a parameter and System class have a static variable in which is of type InputStream. System.in gives you a instance of of type InputStream.
Check this doc of public static final InputStream in
The "standard" input stream. This stream is already open and ready to supply input data.
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