Input and Output - Java - page 380

public public class SimpleCalcScanner {

/** The Scanner */
protected

class SimpleCalcScanner

protected Scanner scan ;

/** The output */
protected protected PrintWriter out = new new PrintWriter ( System . out );

/** The variable name (not used in this version) */
protected

protected String variable ;

/** The operand stack; no operators are pushed, so it can be a stack of Double */
protected

protected Stack < Double > s = new new Stack <>();

/* Driver - main program */
public public static static void void main ( String [] args ) throws throws IOException {

iif ( args . length == 0 )
new new SimpleCalcScanner (

new

new InputStreamReader ( System . in )). doCalc ();

else else

for ( String arg : args ) {
new new SimpleCalcScanner ( arg ). doCalc ();

}

}

/** Construct a SimpleCalcScanner by name */
public public SimpleCalcScanner ( String fileName ) throws throws IOException {

this this ( new new FileReader ( fileName ));

}

/** Construct a SimpleCalcScanner from an open Reader */
public public SimpleCalcScanner ( Reader rdr ) throws throws IOException {

scan = new new Scanner ( rdr );

}

/** Construct a SimpleCalcScanner from a Reader and a PrintWriter */
public public SimpleCalcScanner ( Reader rdr , PrintWriter pw ) throws throws IOException {

this this ( rdr );

setWriter ( pw );

}

/** Change the output to go to a new PrintWriter */
public public void void setWriter ( PrintWriter pw ) {

out = pw ;

}

protected protected void void doCalc () throws throws IOException {