class  complex
{
      double  real,imag;
      complex ()    {}
      complex(double  r,double  i)
           {   real=r;
               imag=i;
           } 
      complex     addition(complex x,complex   y)
           {   this.real=x.real+y.real;
               this.imag=x.imag+y.imag;
               return(this) ;
            }

     complex      subtraction(complex x,complex   y)       
          {   this.real=x.real-y.real;
               this.imag=x.imag-y.imag;
               return(this) ;              
           }

     complex     multiplication(complex x,complex   y)
          {    this.real=(x.real)*(y.real)-(x.imag)*(y.imag);
               this.imag=(x.real)*(y.imag)+(x.imag)*(y.real);
               return(this) ;             
           }

      complex     division(complex x,complex   y)
          {    this.real=((x.real)*(y.real)+(x.imag)*(y.imag))/((y.real)*(y.real)+(y.imag)*(y.imag));
               this.imag=((x.imag)*(y.real)-(x.real)*(y.imag))/((y.real)*(y.real)+(y.imag)*(y.imag));
               return(this) ;
          }

}               

public    class   C
{  
    public  static  void  main(String    args[])
     {   
        complex   c1=new  complex(2,4);
        complex   c2=new  complex(4,8);
        complex   c=new   complex();
         c.addition(c1,c2);
         System.out.println("c=c1(2,4)+c2(4,8)"+" "+c.real+","+c.imag);
         c.subtraction(c1,c2);
         System.out.println("c=c1(2,4)-c2(4,8)"+" "+c.real+","+c.imag);
         c.multiplication(c1,c2);
         System.out.println("c=c1(2,4)*c2(4,8)"+" "+c.real+","+c.imag);
         c.division(c1,c2);
         System.out.println("c=c1(2,4)/c2(4,8)"+" "+c.real+","+c.imag);
      }
} 

name     C.java
运行结果：c=c1(2,4)+c2(4,8)     6.0 ,12.0
                    c=c1(2,4)-c2(4,8)    -2.0 ,-4.0
                    c=c1(2,4)*c2(4,8)    -24.0,32.0
                    c=c1(2,4)/c2(4,8)      0.5,0.0

求助：为什么我在函数中用getReal,getImag分别返回各函数的实部和虚部实现不了？