给出复数，实现复数的四则运算

1.定义两个类——一个为complex,另外一个为complex_oper。计算功能在complex类中实现，方法分别为：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.给出两个复数的实部与虚部，调用相关方法就可以进行计算了。

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 complex(double
a1, double
b1) {
        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
t2)
     {
        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("加法运算的结果为：c= " +
c.getA1() + "+ " +
c.getB1() + "*i");
        System.out.println("此次的加法运算到此已完成！");
        c=complex.sub(a,
b);
        System.out.println("减法运算的结果为：c= " +
c.getA1() + "+ " +
c.getB1() + "*i");
        System.out.println("此次的减法运算到此已完成！");
        c=complex.multiply(a,
b);
        System.out.println("乘法运算的结果为：c= " +
c.getA1() + "+ " +
c.getB1() + "*i");
        System.out.println("此次的乘法运算到此已完成！");
        c=complex.divide(a,
b);
        System.out.println("除法运算的结果为：c= " +
c.getA1() + "+ " +
c.getB1() + "*i");
        System.out.println("此次的除法运算到此已完成！");
    }
}