I need help with this one. I don't quite understand how to chain methods

My class looks like this

It will also be great if you could explain how and why you did some stuff in order for me to understand it more. Thanks a lot

c. In the Complex) class of Lab 4, add the following overloaded equals() methods public boolean equals (Complex c) public boolean equals int real, int imag) public boolean equals (double real, double imag, double delta) public boolean equals (String c) that each return true if both the real and imaginary values of this object are equal to the respective input values passed as parameters to the equals method. (Feel