计科1141广东海洋大学java10(实验4)解答

广东海洋大学学生实验报告书（学生用表）

实验名称实验四.类的基本编程课程名称Java程序设计与开发

技术

课程号

学院(系) 数学与计算机学院专业计算机科学与技术班级计科1141

学生姓名邓超荣学号201411621110 实验地点钟海楼

04017

实验日期

2016.10.2

6

一实验目的：

掌握Java类的基本知识及应用

二实验内容：

定义一个名为Complex的类实现复数概念及运算，它的UML图如下，

先实现该类的相关方法，再试编写主方法来测试该类这些的方法。

GDOU-B-11-112

代码：

public class ComplexDemo {

public static void main(String[] args) {

Complex c1 = new Complex(1,2);

Complex c2 = new Complex(2,3);

Complex c3 = new Complex(4,-2);

double c = -2;

Complex sum = new Complex();

sum = https://www.360docs.net/doc/3d7966116.html,plexAdd(c1,c2);

System.out.println("(1+2i)+(2+3i)="+sum);

sum = https://www.360docs.net/doc/3d7966116.html,plexAdd(c1, c);

System.out.println("(1+2i)+(-2)="+sum);

sum = https://www.360docs.net/doc/3d7966116.html,plexAdd(c1,c2,c3);

System.out.println("(1+2i)+(2+3i)+(4-2i)="+sum);

Complex mid = new Complex();

mid = https://www.360docs.net/doc/3d7966116.html,plexMinus(c1,c2);

System.out.println("(1+2i)-(2+3i)="+mid);

mid = https://www.360docs.net/doc/3d7966116.html,plexMinus(c1, c);

System.out.println("(1+2i)-(-2)="+mid);

Complex mul = new Complex();

mul = https://www.360docs.net/doc/3d7966116.html,plexMul(c1,c2);

System.out.println("(1+2i)*(2+3i)="+mul);

mul = https://www.360docs.net/doc/3d7966116.html,plexMul(c1, c);

System.out.println("(1+2i)*(-2)="+mul);

mul = https://www.360docs.net/doc/3d7966116.html,plexMul(c1,c2,c3);

System.out.println("(1+2i)*(2+3i)*(4-2i)="+mul);

}

}

class Complex {

double realPart;

double imaginaryPart;

Complex(){} //默认构造函数

Complex(double r,double i) { //带参数的构造函数realPart = r;

imaginaryPart = i;

}

double getRealPart() { //返回实部

return realPart;

}

void setRealPart(double d) { //设置实部

realPart = d;

}

double getImaginaryPart() { //返回虚部

return imaginaryPart;

}

void setImaginaryPart(double d) { //设置虚部imaginaryPart = d;

}

Complex complexAdd(Complex c1,Complex c2) { //复数对象与复数对象相加

Complex sum = new Complex();

sum.realPart = c1.realPart + c2.realPart;

sum.imaginaryPart = c1.imaginaryPart +

c2.imaginaryPart;

return sum;

}

Complex complexAdd(Complex c1,double c2) { //复数

对象与实数相加

Complex sum = new Complex();

sum.realPart = c1.realPart + c2;

sum.imaginaryPart = c1.imaginaryPart;

return sum;

}

Complex complexAdd(Complex c1,Complex c2,Complex c3) { //三个复数相加

Complex sum = new Complex();

sum.realPart = c1.realPart + c2.realPart +

c3.realPart;

sum.imaginaryPart = c1.imaginaryPart +

c2.imaginaryPart + c3.imaginaryPart;

return sum;

}

Complex complexMinus(Complex c1,Complex c2) { //复数对象与复数对象相减

Complex mid = new Complex();

mid.realPart = c1.realPart - c2.realPart;

mid.imaginaryPart = c1.imaginaryPart -

c2.imaginaryPart;

return mid;

}

Complex complexMinus(Complex c1,double c2) { //复数对象与实数相减

Complex mid = new Complex();

mid.realPart = c1.realPart - c2;

mid.imaginaryPart = c1.imaginaryPart;

return mid;

}

Complex complexMul(Complex c1,Complex c2) { //复数对象与复数对象相乘

Complex mul = new Complex();

mul.realPart = c1.realPart * c2.realPart -

c1.imaginaryPart * c2.imaginaryPart;

mul.imaginaryPart= c1.realPart* c2.imaginaryPart + c1.imaginaryPart * c2.realPart;

return mul;

}

Complex complexMul(Complex c1,double c2) { //复数对象与实数相乘

Complex mul = new Complex();

mul.realPart = c1.realPart * c2;

mul.imaginaryPart = c1.imaginaryPart * c2;

return mul;

}

Complex complexMul(Complex c1,Complex c2,Complex c3) { //三个复数相乘

Complex mul = new Complex();

mul.realPart = c1.realPart * c2.realPart -

c1.imaginaryPart * c2.imaginaryPart;

mul.imaginaryPart= c1.realPart* c2.imaginaryPart + c1.imaginaryPart * c2.realPart;

double r = mul.realPart;

double i = mul.imaginaryPart;

mul.realPart = r * c3.realPart - i *

c3.imaginaryPart;

mul.imaginaryPart = r * c3.imaginaryPart + i *

c3.realPart;

return mul;

}

public String toString() { //以a+bi的形式显示复数

String s = new String();

if(realPart!=0){

if(imaginaryPart>0) {

s = (int)realPart + "+" + (int)imaginaryPart + "i";

}

else if(imaginaryPart==0) {

s = String.valueOf((int)realPart);

}

else{

s= (int)realPart+ ""+ (int)imaginaryPart+ "i";

}

}

else{

if(imaginaryPart>0) {

s = (int)imaginaryPart + "i";

}

else if(imaginaryPart==0) {

s = String.valueOf(0);

}

else{

s = (int)imaginaryPart + "i";

}

}

return s;

}

}