Lab Static Method, Part II

public class complexdemo {
public static void main(String[] args) {
Complex a=new Complex(2,3);
Complex b=new Complex(4,5);
Complex.add(a,b);
System.out.println(a+"+"+b+"="+Complex.add(a,b));
a.add(b);
System.out.println(a+"+"+b+"="+a.add(b));

}
}


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public class Complex {
private double r=0;
private double i=0;

Complex() //最好補上,因為你有設另一個CONSTRUCTOR complex(a,b)
{}

Complex(double a,double b)
{ r=a;i=b; }

public Complex add(Complex a)
{
Complex c=new Complex();
c.r=r+a.r;
c.i=i+a.i;
return c;
}

public static Complex add(Complex a,Complex b)
{Complex c=new Complex(); //()內別填否則confused
c.r=a.r+b.r;c.i=a.i+b.i;
return c;
}
public String toString(){
return("("+r +"+"+ i+"*i"+")");
} }