_Fourier dft = new DiscreteFourier(signal); //Works well for short signals (<200 points)
OR
_Fourier dft = new FastFourier(signal); //Works well for longer signals (>200 points)
dft.transform();

boolean onlyPositive = true;
double[] out = dft.getMagnitude(onlyPositive); //Positive Absolute

boolean onlyPositive = true;
double[][] out = dft.getComplex2D(onlyPositive); //Positive Complex

boolean onlyPositive = false;
double[] out = dft.getMagnitude(onlyPositive); //Full Absolute

boolean onlyPositive = false;
double[][] out = dft.getComplex2D(onlyPositive); //Full Complex

// Automatically detects real and complex sequence and performs IDFT accordingly
_InverseFourier idft = new InverseDiscreteFourier(complexSequence); //When DFT is performed using DiscreteFourier
OR
_InverseFourier idft = new InverseFastFourier(complexSequence); //When DFT is performed using FasrFourier
idft.transform();

double[] outReal = idft.getReal(); //To get only the real component
double[] outAbsolute = idft.getMagnitude(); //To get the absolute value of the complex signal
double[][] out = idft.getComplex2D(); // To get the complex signal