System.out & System.in are final static data member of System
class but we can change there reference through setOut() &
setIn() method how...
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Answer Posted / rupakbhuyan
The System class provides the static methods setIn(),
setOut(), and setErr() for this purpose. The setIn() method
requires an argument of type InputStream that specifies the
new source of standard input. The other two methods expect
an argument of type PrintStream.
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