public class Complex implements IComplex { public static final Complex ZERO; public static final Complex ONE; public static final Complex I; static { ZERO = null; ONE = null; I = null; } public Complex(double re, double im) { } public Complex(double re) { } public Complex() { } public Complex add(Complex that) { return null; } public Complex add(double that) { return null; } public Complex subtract(Complex that) { return null; } public Complex subtract(double that) { return null; } public Complex multiply(Complex that) { return null; } public Complex multiply(double that) { return null; } public Complex divide(Complex that) { return null; } public Complex divide(double that) { return null; } public Complex conjugate() { return null; } public double abs() { return 0; } public Complex pow(int n) { return null; } public double re() { return 0; } public double im() { return 0; } public double Arg() { return 0; } public boolean equals(Object o) { return false; } public String toString() { return ""; } }