1.定義兩個類——一個為complex,另外一個為complex_oper。計算功能在complex類中實現，方法分別為：public static complex add(complex t1,complex t2)，public static complex sub(complex t1,complex t2)，public static complex multiply(complex t1,complex t2)，public static complex divide(complex t1,complex t2)。

2.給出兩個複數的實部與虛部，呼叫相關方法就可以進行計算了。

class complex

{

     double a1;

     double b1;

    public double getA1() {

        return a1;

    }

    public void setA1(double a1) {

        this.a1 = a1;

    }

    public double getB1() {

        return b1;

    }

    public void setB1(double b1) {

        this.b1 = b1;

    }

    public

        super();

        this.a1 = a1;

        this.b1 = b1;

    }

    public static complex add(complex t1,complex t2)

     {

        complex t3= new complex(0, 0);

        t3.a1=t1.a1+t2.a1;

        t3.b1=t1.b1+t2.b1;

         return t3;

     }

    public static complex sub(complex t1

     {

        complex t3= new complex(0, 0);

        t3.a1=t1.a1-t2.a1;

        t3.b1=t1.b1-t2.b1;

         return t3;

     }

     public static complex multiply(complex t1,complex t2)

     {

         complex t3= new complex(0, 0);

         t3.a1=t1.a1*t2.a1-t1.b1*t2.b1;

         t3.b1=t1.a1*t2.b1+t2.a1*t1.b1;

         return t3;

     }

     public static complex divide(complex t1,complex t2)

     {

         complex t3= new complex(0, 0);

         t3.a1=(t1.a1*t2.a1-t1.b1*t2.b1)/(t2.a1*t2.a1+t2.b1*t2.b1);

         t3.b1=(t2.a1*t1.b1+t1.a1*t2.b1)/(t2.a1*t2.a1+t2.b1*t2.b1);

         return t3;

     }

}

public class complex_oper

{

    public static void main(String[] args)

    {

        complex a=new complex(3,4);

        complex b=new complex(2,1);

        complex c;

        c=complex.add(a, b);

        System.out.println("加法運算的結果為：c= " + c.getA1() + "+ " + c.getB1() + "*i");

        System.out.println("此次的加法運算到此已完成！");

        c=complex.sub(a, b);

        System.out.println("減法運算的結果為：c= " + c.getA1() + "+ " + c.getB1() + "*i");

        System.out.println("此次的減法運算到此已完成！");

        c=complex.multiply(a, b);

        System.out.println("乘法運算的結果為：c= " + c.getA1() + "+ " + c.getB1() + "*i");

        System.out.println("此次的乘法運算到此已完成！");

        c=complex.divide(a, b);

        System.out.println("除法運算的結果為：c= " + c.getA1() + "+ " + c.getB1() + "*i");

        System.out.println("此次的除法運算到此已完成！");

    }

}