复利计算--结对项目

结对项目：复利计算

搭档：30蔡京航  http://www.cnblogs.com/cjh123/

 github:https://github.com/alfredzhu/teamwork

工作照

一、项目需求:

     即要追求利益，又要面对不可预知的金融投资风险， “不能把鸡蛋放在同一个篮子里”，所以有必要进行组合投资。

     通过上述计算与对比，可以帮助客户进行投资决策。 

     客户：那么能否帮我记录下一笔一笔不同类型的投资，并动态显示资金现值呢？

二、完成要求：以结对方式完成。

在这次结对编程中分配任务  我：设计代码并审核，单元测试减少bug

                                    蔡京航：设计界面，查阅资料，令代码规范并美观

在这这次结对编程的收获到和感悟：结对后，两个人都有不同的想法，在设计的时候可以及时提出质疑并觉得怎样做比较好

                                            并指出错误，因此能互相受益，感觉很不错，能提高质量。

三、估算时间

估计用时：1.5h

估计代码行：300

实际用时：2.5h

实际代码行：304

 

四、用txt文件来动态显示历史信息

 

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;


public class txtIO { 

public static void main (String args[]) { 

ReadDate(); 

WriteDate(); 

} 

/** 
* 读取数据 
 * @return 
*/ 
public static void ReadDate() { 
    CompoundCalculator C=new CompoundCalculator();
String url = "F:/gitfile/testgit/historydata.txt"; 
try { 
FileReader read = new FileReader(new File(url)); 
StringBuffer sb = new StringBuffer(); 
char ch[] = new char[1024]; 
int d = read.read(ch); 
while(d!=-1){ 
String str = new String(ch,0,d); 
sb.append(str); 
d = read.read(ch); 
} 
C.jTextArea1.setText(sb.toString());
System.out.print(sb.toString()); 
} catch (FileNotFoundException e) { 
e.printStackTrace(); 
} catch (IOException e) { 
e.printStackTrace(); 
}
} 

/** 
* 写入数据 
*/ 
public static void WriteDate() { 

try{ 
File file = new File("F:/gitfile/testgit/historydata.txt"); 
Writer out = null ;
out = new FileWriter(file,true) ;
if (file.exists()) { 

file.delete(); 
} 
CompoundCalculator C=new CompoundCalculator();
double P=C.P, i=C.i, F=C.F;//F:复利终值 P:本金 i:利率
int N=C.N, M=C.M, m=C.m;//N:利率获取时间的整数倍 M:复利次数 m:月数
int result=C.result;
int action=C.action;
file.createNewFile(); 


if(action==1){
    out.write("
"+"复利"+"
");
    out.write("本金:" + P + "
" + "年利率(%):" + i + "
"
            + "存入年限:" + N + "
" + "年复利次数:" + M + "
" + "复利终值:" + F
            + "
"); 
}
if(action==2){
    out.write("
"+"单利"+"
");
    out.write("本金:" + P + "
" + "年利率(%):" + i + "
"
            + "存入年限:" + N + "
" + "复利终值:" + F + "
"); 
}
if(action==3){
    out.write("
"+"本金估算"+"
");
    out.write("复利终值:" + F + "
" + "年利率(%):" + i + "
"
            + "存入年限:" + N + "
" + "年复利次数:" + M + "
" + "本金:" + P
            + "
"); 
}
if(action==4){
    out.write("
"+"年限估算"+"
");
    out.write("本金:" + P + "
" + "年利率(%):" + i + "
"
            + "年复利次数:" + M + "
" + "复利终值:" + F + "
" + "年限:" + N
            + "
"); 
}
if(action==5){
    out.write("
"+"利率估算"+"
");
    out.write("本金:" + P + "
" + "存入年限:" + N + "
" + "年复利次数:"
            + M + "
" + "复利终值:" + F + "
" + "年利率(%):" + i + "
"); 
}
if(action==6){
    out.write("
"+"定期投资(年)"+"
");
    out.write("年投资金额:" + P + "
" + "年利率(%):" + i + "
"
            + "定投年数:" + N + "
" + "终值:" + F + "
"); 
}
if(action==7){
    out.write("
"+"定期投资(月)"+"
");
    out.write("月投资金额:" + P + "
" + "年利率(%):" + i + "
"
            + "定投月数:" + m + "
" + "终值:" + F + "
"); 
}
if(action==8){
    out.write("
"+"等额本息还款"+"
");
    out.write("贷款金额:" + P + "
" + "年利率(%):" + i + "
"
            + "年限:" + N + "
" + "年复利次数:" + M + "
" + "等额本息还款额:" + F
            + "
"); 
}
//} 
out.close(); 
} catch (Exception ex) { 
System.out.println(ex); 
} 

} 

}

 

五、运行效果