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What exactly is System.in? (Java)
Name: Payne Date: January 12, 2003 at 10:51:56 Pacific OS: Windows 2k CPU/Ram: 800/256
Comment:
Hello. I am currently reading a book for Java beginners and I am currently working on a chapter about I/O. This chapter has left me somewhat puzzled, though, because it was explaining that there are 3 predefined streams (in, out, and err) in the System class. Then it said that System.in was an object of the InputStream class. It explained earlier, however, that InputStream was an abstract class and according to the book it is not possible to create objects of abstract classes. So my question would be, how is it possible that System.in is an object of InputStream? If anyone could lend an explanation about this I would be greatly appreciative.
Name: Skvat Date: January 17, 2003 at 12:33:46 Pacific
Reply:
You are right, the Class 'System' cannot be instantiated, but all the methods are static, alas they can be run regardless, because they are invoked through the Class rather than through an instance(of the class).
Hope this helped, if you have any questions feel free to contact me.
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