20145122《Java面向对象程序设计》实验二实验报告

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

步骤耗时百分比
需求分析 1h 12.5%
设计 1h 12.5%
代码实现 3h 37.5%
测试 1h 12.5%
分析总结 2h 25.0%
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

步骤	耗时	百分比
需求分析	1h	12.5%
设计	1h	12.5%
代码实现	3h	37.5%
测试	1h	12.5%
分析总结	2h	25.0%

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() + " = " + a.complexAdd(b).toString());
System.out.println(a.toString() + " + " + z + " = "  + a.complexAdd(z).toString());System.out.println(a.toString() + " - " + b.toString() + " = " + a.complexMinus(b).toString());
System.out.println(a.toString() + " - " + z + " = " + a.complexMinus(z).toString());System.out.println(a.toString() + " * " + b.toString() + " = " + a.complexMinus(b).toString());
System.out.println(a.toString() + " * " + z + " = " + a.complexMulti(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 = a.complexAdd(b);if(x.getRealPart() !=25.0 )System.out.println("test failed 1!");x = a.complexAdd(z);if(x.getRealPart() !=30.0 )System.out.println("test failed 11!");x = a.complexAdd(b);if( x.getImaginaryPart()!=15.0 )System.out.println("test failed 2!");x = a.complexAdd(z);if( x.getImaginaryPart()!=10.0 )System.out.println("test failed 22!");x = a.complexMinus(b);if( x.getRealPart()!=15.0 )System.out.println("test failed 3!");x = a.complexMinus(z);if( x.getRealPart()!=10.0 )System.out.println("test failed 33!");x = a.complexMinus(b);if( x.getImaginaryPart()!=5.0 )System.out.println("test failed 4!");x = a.complexMinus(z);if( x.getImaginaryPart()!=10.0 )System.out.println("test failed 44!");x = a.complexMulti(b);if( x.getRealPart() !=50.0 )System.out.println(x.getRealPart()+"test failed 5!");x = a.complexMulti(z);if( x.getRealPart() !=200.0 )System.out.println("test failed 55!");x = a.complexMulti(b);         if( x.getImaginaryPart()!=150.0 )System.out.println("test failed 6!");x = a.complexMulti(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！