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The System class in java.lang provides the "standard" IO streams System.in, System.out, and System.err.
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| 2 |
System.in is an instance of InputStream.
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System.out and System.err are instances of PrintStream.
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| 4 |
PrintStream is a subclass of FilterOutputStream, which itself is a subclass of OutputStream.
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PrintStream objects should not be instantiated; use other subclasses of FilterOutputStream for byte streams or PrintWriter objects for character streams.
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PrintStream and PrintWriter define methods print(...) and println(...), which output any primitive type:
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System.out.println( "Enter character: " );
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int ch = System.in.read();
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System.out.println( (char) ch );
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