实验名称： Java面向对象程序设计
实验内容：
初步掌握单元测试和TDD理解并掌握面向对象三要素：封装、继承、多态初步掌握UML建模熟悉S.O.L.I.D原则了解设计模式
PSP时间
代码实现过程
直接使用老师实验课上给出的伪代码。
m_dRealPart: 实部，代表复数的实数部分
m_dImaginPart:虚部，代表复数的虚数部分
ComplexNumber()构造函数，将实部，虚部都置为0
ComplexNumber(double r, double I)构造函数，创建复数对象的同时完成复数的实部，虚部的初始化
GetRealPart()获取实部
GetImaginaryPart()获取虚部
SetRealPart(double d)设置实部
SetImaginaryPart(double d)设置虚部
ComplexAdd(ComplexNumber c)复数相加
ComplexAdd(double c)复数相加
ComplexMinus(ComplexNumber c)复数相减
ComplexMinus(double c)复数相减
ComplexMulti(ComplexNumber c) 复数相乘
ComplexMulti(double c) 复数相乘
toString() 把当前复数对象的实部，虚部组合成a+bi的字符串形式
根据复数运算的加减乘三个功能进行代码设计。敲出产品代码
package czy;public class complex{public static void main (String args[]){ComplexNumber a = new ComplexNumber(20,10);ComplexNumber b = new ComplexNumber(5,5);double z = 10.0;System.out.println(a.toString() + " + " +b.toString() + " = " + plexAdd(b).toString());System.out.println(a.toString() + " + " + z + " = " + plexAdd(z).toString());System.out.println(a.toString() + " - " + b.toString() + " = " + plexMinus(b).toString());System.out.println(a.toString() + " - " + z + " = " + plexMinus(z).toString());System.out.println(a.toString() + " * " + b.toString() + " = " + plexMinus(b).toString());System.out.println(a.toString() + " * " + z + " = " + plexMulti(z).toString());}}class ComplexNumber{private double realpart;private double imaginpart;ComplexNumber(){realpart = 0.0;imaginpart = 0.0;}ComplexNumber(double r,double I){realpart = r;imaginpart = I;}ComplexNumber(ComplexNumber c){realpart = c.getRealPart();imaginpart = c.getImaginaryPart();}double getRealPart(){return realpart;}double getImaginaryPart(){return imaginpart;}void setRealPart(double d){realpart = d;}void setImaginaryPart(double d){imaginpart = d;}ComplexNumber complexAdd(ComplexNumber c){return new ComplexNumber( this.realpart + c.getRealPart(), this.imaginpart + c.getImaginaryPart());}ComplexNumber complexAdd(double c){return new ComplexNumber( this.realpart + c, this.imaginpart);}ComplexNumber complexMinus(ComplexNumber c){return new ComplexNumber( this.realpart - c.getRealPart(),this.imaginpart - c.getImaginaryPart());}ComplexNumber complexMinus(double c){return new ComplexNumber( this.realpart - c, this.imaginpart);}ComplexNumber complexMulti(ComplexNumber c){return new ComplexNumber( this.realpart * c.getRealPart() - this.realpart * c.getImaginaryPart(),this.realpart * c.getImaginaryPart() + this.imaginpart * c.getRealPart());}ComplexNumber complexMulti(double c){return new ComplexNumber( this.realpart * c, this.imaginpart * c);}public String toString(){return "(" + realpart + " + " + imaginpart + " i" + ")";}}
完成后进行测试代码:
package czy;public class complextest {public static void main (String args[]){ComplexNumber a = new ComplexNumber(20,10);ComplexNumber b = new ComplexNumber(5,5);ComplexNumber x = new ComplexNumber();double z = 10.0;x = plexAdd(b);if(x.getRealPart() !=25.0 )System.out.println("test failed 1!");x = plexAdd(z);if(x.getRealPart() !=30.0 )System.out.println("test failed 11!");x = plexAdd(b);if( x.getImaginaryPart()!=15.0 )System.out.println("test failed 2!");x = plexAdd(z);if( x.getImaginaryPart()!=10.0 )System.out.println("test failed 22!");x = plexMinus(b);if( x.getRealPart()!=15.0 )System.out.println("test failed 3!");x = plexMinus(z);if( x.getRealPart()!=10.0 )System.out.println("test failed 33!");x = plexMinus(b);if( x.getImaginaryPart()!=5.0 )System.out.println("test failed 4!");x = plexMinus(z);if( x.getImaginaryPart()!=10.0 )System.out.println("test failed 44!");x = plexMulti(b);if( x.getRealPart() !=50.0 )System.out.println(x.getRealPart()+"test failed 5!");x = plexMulti(z);if( x.getRealPart() !=200.0 )System.out.println("test failed 55!");x = plexMulti(b); if( x.getImaginaryPart()!=150.0 )System.out.println("test failed 6!");x = plexMulti(z); if( x.getImaginaryPart()!=100.0 )System.out.println("test failed 66!");else System.out.println("test passed!"); }}class ComplexNumber{private double realpart;private double imaginpart;ComplexNumber(){realpart = 0.0;imaginpart = 0.0;}ComplexNumber(double r,double I){realpart = r;imaginpart = I;}ComplexNumber(ComplexNumber c){realpart = c.getRealPart();imaginpart = c.getImaginaryPart();}double getRealPart(){return realpart;}double getImaginaryPart(){return imaginpart;}void setRealPart(double d){realpart = d;}void setImaginaryPart(double d){imaginpart = d;}ComplexNumber complexAdd(ComplexNumber c){return new ComplexNumber( this.realpart + c.getRealPart(), this.imaginpart + c.getImaginaryPart());}ComplexNumber complexAdd(double c){return new ComplexNumber( this.realpart + c, this.imaginpart);}ComplexNumber complexMinus(ComplexNumber c){return new ComplexNumber( this.realpart - c.getRealPart(),this.imaginpart - c.getImaginaryPart());}ComplexNumber complexMinus(double c){return new ComplexNumber( this.realpart - c, this.imaginpart);}ComplexNumber complexMulti(ComplexNumber c){return new ComplexNumber( this.realpart * c.getRealPart() - this.realpart * c.getImaginaryPart(),this.realpart * c.getImaginaryPart() + this.imaginpart * c.getRealPart());}ComplexNumber complexMulti(double c){return new ComplexNumber( this.realpart * c, this.imaginpart * c );}public String toString(){return "(" + realpart + " + " + imaginpart + " i" + ")";}}
运行的时候出现了问题！
找到出错的地方，将关于复数乘法的代码改为:
ComplexNumber complexMulti(ComplexNumber c){return new ComplexNumber( this.realpart * c.getRealPart() - this.imaginpart * c.getImaginaryPart(),this.realpart * c.getImaginaryPart() + this.imaginpart * c.getRealPart());}
成功！
实验问题和解决方法
实验过程关于复数算法出现了一些错误，但写了测试代码后成功进行了修改。还有如果用debug的话可能方便一些。
测试代码的好处
使用测试代码后会减少程序出现的bug，在符合客户需求的情况下使代码更加完善，也能锻炼我们的思维，增强我们认真负责的意识，一举多得。
