complexnumber.java

用java Japplet画julia和Mandrabriot曲线

public class ComplexNumber{
    public double real,image; 
    public ComplexNumber(){
        real = 0; image = 0;
    }
    public ComplexNumber(double r,double i){
        real = r; image = i;
    }
    public ComplexNumber add(ComplexNumber c){ 
        real = real + c.real;
        image = image + c.image;
        return this;
    }    
    public ComplexNumber substract(ComplexNumber c){ 
        real = real - c.real;
        image = image - c.image;
        return this;
    }
    public ComplexNumber multiple(ComplexNumber c){
        double temp;
        temp = real*c.real - image*c.image;
        image = real*c.image + image*c.real;
        real = temp;
        return this;
    }
    public ComplexNumber devide(ComplexNumber c){
        double temp;
        if( c.real == 0 && c.image ==0 )
            System.out.println("the Complex Number can not be devided by zero!");
        else{
            temp = (real*c.real + image*c.image)/(c.real*c.real + c.image*c.image);
            image =(c.real*image-real*c.image)/( c.real*c.real + c.image*c.image );
            real = temp;
        }
        return this;
    }
    
    public double cabs( ComplexNumber c ){
        double mod = java.lang.Math.sqrt(c.real*c.real+c.image*c.image);
        return mod;
    }
    
    public void citer( int N, ComplexNumber z0, ComplexNumber muon ){
        ComplexNumber z = new ComplexNumber(z0.real, z0.image);
        for (int n = 0; n < N; n++) {
            z = z.multiple(z).substract( muon );
        }
    }

    public void presult(String s){
        String rs;
        Double r= new Double( this.real );
        rs = r.toString();
        if ( real == 0 )
            rs ="";
        if( image < 0 && rs !="")
            System.out.println(s + rs + " - "+ (double)(-1)*image+"i");
        else if( image == 0 )
            System.out.println(s + rs);
        else
            System.out.println(s + rs + " + " + image +"i");
    }

}