20145106 java实验二

1）复数类ComplexNumber的属性

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

public class ComplexNumber {private double m_dRealPart;
private double m_dImaginPart;

2）复数类ComplexNumber的方法

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

public ComplexNumber(){
double m_dRealPart = 0;
double m_dImaginPart = 0;
}public ComplexNumber(double r, double i) {
this.m_dRealPart = r;
this.m_dImaginPart = i;
} public double real() {
return this.m_dRealPart;
}public double imag() {
return this.m_dImaginPart;
}


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

public ComplexNumber complexAdd(ComplexNumber c) {
return new ComplexNumber(c.real() + this.real(), c.imag() + this.imag());
}public ComplexNumber complexMinus(ComplexNumber c) {
return new ComplexNumber(c.real() - this.real(), c.imag() - this.imag());
}public ComplexNumber complexMultiply(ComplexNumber c) {
return new ComplexNumber(
this.real() * c.real() - this.imag() * c.imag(),
this.imag() * c.real() + this.real() * c.imag());
}public ComplexNumber complexDivide(ComplexNumber c) {
double div2 = c.real() * c.real() + c.imag() * c.imag();
return new ComplexNumber(
(this.real() * c.real() + c.imag() * this.imag()) / div2,
(this.imag() * c.real() - this.real() * c.imag()) / div2);
}


toString() 把当前复数对象的实部，虚部组合成a+bi的字符串形式

public String toString() {
return "(" + this.real() + "+" + this.imag() +"i"+ ")";
}public static void main(String args[]) {
ComplexNumber cn = new ComplexNumber(1, 2);
System.out.println(cn);
cn = cn.complexMultiply(new ComplexNumber(6, 4));
System.out.println(cn);
}


实验体会：作为第二个java实验，我认为实验难度要明显高于实验一（从四则运算到复数的运算）。从一开始就遇到了很多困难，根本不知道该如何敲。后来有了方向，跟着步骤做了下来。虽然参考了百度中的代码，不过自己也有所学习。譬如说一开始我没有想到应用this，经过学习也巩固了this的实际用法。参考：http://zhidao.baidu.com/link?url=I2Odm3vMxnZJ9NhTxFygUSsmkxIOC-iT3B9PukPHJ4BWJQOUdTWD24Isrn8m5xhVUy9vI6JrHG95GQCZ_zkV0a

步骤 耗时 百分比

需求分析 30min 16.7%

设计 30min 16.7%

代码实现 1h 33%

测试 30min 16.7%

分析总结 30min 16.7%