java 中实现复数的加减
（1）：具体代码(附注释)
复数类：
public class Complex {
private float shibu;
private float xubu;
Complex()
{this(0,0);
}
Complex(float shibu,float xubu){
this.shibu=shibu;
this.xubu=xubu;
}
public void Add(Complex p)
{
Complex result=new Complex();
result.shibu=this.shibu+p.shibu;
result.xubu=this.xubu+p.xubu;
System.out.print("加法结果为:"+result.shibu+"+"+result.xubu+"i");
}
public void Sub(Complex p)
{
Complex result=new Complex();
result.shibu=this.shibu-p.shibu;
result.xubu=this.xubu-p.xubu;
System.out.print("加法结果为:"+result.shibu+"+"+result.xubu+"i");
}
public void Mul(Complex p)
{
Complex result=new Complex();
result.shibu=this.shibu*p.shibu-this.xubu*p.xubu;
result.xubu=this.shibu*p.xubu+p.shibu*this.xubu;
System.out.print("乘法结果为:"+result.shibu+"+"+result.xubu+"i");
}
public static void main(String[] args) {
Complex fushu1=new Complex(1,2);
Complex fushu2=new Complex(3,4);
fushu1.Add(fushu2);
fushu1.Sub(fushu2);
fushu1.Mul(fushu2);
}
}
（2）：提供一个例子：
源代码：
import java.io.*;
public class Book{
double sb;
double xb;
Book(double x,double y){
this.sb=x;
this.xb=y;
}
Book(){
}
public static void main(String args[]){
System.out.println("请输入数据：");
double a=0;
double b=0;
double c=0;
double d=0;
String s;
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入第一个复述的实部：");
try{
s = in.readLine();
a=Double.parseDouble(s);
}
catch(IOException e)
{ System.out.println("抛掷异常");}
System.out.println("请输入第一个复述的虚部：");
try{
s = in.readLine();
b =Double.parseDouble(s);
}
catch(IOException e)
{ System.out.println("抛掷异常");}
System.out.println("请输入第二个复述的实部：");
try{
s = in.readLine();
c =Double.parseDouble(s);
}
catch(IOException e)
{ System.out.println("抛掷异常");}
System.out.println("请输入第二个复述的虚部：");
try{
s = in.readLine();
d =Double.parseDouble(s);
}
catch(IOException e)
{ System.out.println("抛掷异常");}
Book h;
h=new Book(a,b);
Book j;
j=new Book(c,d);
System.out.println("您输入的一个数为：");
toString(h);
System.out.println("您输入的二个数为：");
toString(j);
Book k;
k=new Book();
char z='y';
do{
System.out.println("请选择您要进行的计算：");
System.out.println("1 ：进行加法运算");
System.out.println("2 ：进行减法运算");
System.out.println("3 ：进行修改");
System.out.println("4 ：进行乘法运算");
System.out.println("5 ：进行除法运算");
System.out.println("6 ：查看修改结果");
int i=0;
try{
i= Integer.parseInt(in.readLine());
}
catch(IOException e)
{ System.out.println("抛掷异常");}
switch(i)
{
case 1:
k.sb=jia(h.sb,j.sb);
k.xb=jia(h.xb,j.xb);
System.out.println("计算结果的实部为："+k.sb);
System.out.println("计算结果的虚部为："+k.xb);
toString(k);
break ;
case 2:
k.sb=jian(h.sb,j.sb);
k.xb=jian(h.xb,j.xb);
System.out.println("计算结果的实部为："+k.sb);
System.out.println("计算结果的虚部为："+k.xb);
toString(k);
break ;
case 3:
System.out.println("请输入您要修改哪个实数：");
int l=0;
try{
l= Integer.parseInt(in.readLine());
}
catch(IOException e)
{ System.out.println("抛掷异常");}
if(l==1)
{
h.xiugais(h);
h.xiugaix(h);
}
else
{
xiugais(j);
xiugaix(j);
}
break ;
case 4:
double f=0;
double e=0;
f=cheng(h.sb,j.sb)+cheng(h.xb,j.xb);
e=cheng(h.sb,j.xb)+cheng(h.xb,j.sb);
k.sb=(double)(Math.round(f*100)/100.0);
k.xb=(double)(Math.round(e*100)/100.0);
System.out.println("计算结果的实部为："+k.sb);
System.out.println("计算结果的虚部为："+k.xb);
toString(k);
break ;
case 5:
double chushu=cheng(j.sb,j.sb)-cheng(j.xb,-j.xb);
double beichushus=jian(cheng(h.sb,j.sb),cheng(h.xb,-j.xb));
double beichushux=jia(cheng(h.sb,-j.xb),cheng(h.xb,j.sb));
k.sb=chu(beichushus,chushu);
k.xb=chu(beichushux,chushu);
System.out.println("计算结果的实部为："+k.sb);
System.out.println("计算结果的虚部为："+k.xb);
toString(k);
break ;
case 6:
System.out.println("修改后的结果为：");
System.out.println("第一个复数："+toString(h));
System.out.println("第二个复数："+toString(j));
break ;
}
System.out.println("请问您是否还要继续 y/n：");
try{
z=(char)System.in.read();
System.in.skip(2); //忽略回车换行
}
catch(IOException e){}
} while(z=='y');
}
public static double gets(Book a){
return a.sb;
}
public static double getx(Book b){
return b.xb;
}
public static double xiugais(Book a)
{
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入您要修改的实部：");
double m=0;
try{
m= Double.parseDouble(in.readLine());
}
catch(IOException e)
{ System.out.println("抛掷异常");}
a.sb=m;
System.out.println("修改成功：");
return 0;
}
public static double xiugaix(Book b)
{
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入您要修改的虚部：");
double n=0;
try{
n= Double.parseDouble(in.readLine());
}
catch(IOException e)
{ System.out.println("抛掷异常");}
b.xb=n;
System.out.println("修改成功：");
return 0;
}
public static double jia(double a,double b)//
{
double c=0;
c=a+b;
System.out.println("加法成功：");
return c ;
}
public static double jian(double a,double b)
{
double c=0;
c=a-b;
System.out.println("减法成功：");
return c;
}
public static double cheng(double a,double b)
{
double c=0;
c=a*b;
System.out.println("乘法成功：");
return c;
}
public static double chu(double a,double b)
{
double d=0;
double c=0;
d=a/b;
c=(double)(Math.round(d*100)/100.0);
System.out.println("除法成功：");
return c ;
}
public static double toString(Book a){
System.out.println("结果为："+a.sb+"+"+a.xb+"*i");
return 0;
}
}
（3）测试结果截图：
//复数类。
public class Complex
{
private double real,im; //实部，虚部
public Complex(double real, double im) //构造方法
{
this.real = real;
this.im = im;
}
public Complex(double real) //构造方法重载
{
this(real,0);
}
public Complex()
{
this(0,0);
}
public Complex(Complex c) //拷贝构造方法
{
this(c.real,c.im);
}
public boolean equals(Complex c) //比较两个对象是否相等
{
return this.real==c.real && this.im==c.im;
}
public String toString()
{
return "("+this.real+"+"+this.im+"i)";
}
public void add(Complex c) //两个对象相加
{ //改变当前对象，没有返回新对象
this.real += c.real;
this.im += c.im;
}
public Complex plus(Complex c) //两个对象相加，与add()方法参数一样不能重载
{ //返回新创建对象，没有改变当前对象
return new Complex(this.real+c.real, this.im+c.im);
}
public void subtract(Complex c) //两个对象相减
{ //改变当前对象，没有返回新对象
this.real -= c.real;
this.im -= c.im;
}
public Complex minus(Complex c) //两个对象相减，与subtract()方法参数一样不能重载
{ //返回新创建的对象，没有改变当前对象
return new Complex(this.real-c.real, this.im-c.im);
}
}
class Complex__ex
{
public static void main(String args[])
{
Complex a = new Complex(1,2);
Complex b = new Complex(3,5);
Complex c = a.plus(b); //返回新创建对象
System.out.println(a+" + "+b+" = "+c);
}
}
/*
程序运行结果如下：
(1.0+2.0i) + (3.0+5.0i) = (40.0+7.0i)
*/
