從檔案讀入資料

[Steven_Tian]

import java.text.DecimalFormat;
import java.util.*;
import java.io.*;

public class StockTransaction {

public static void main(String[] args) {
File src = new File(
"D:\\ProgramFiles\\eclipse\\test\\src\\trans.txt");
LinkedList ll = new LinkedList();
try {
FileInputStream f = new FileInputStream(src);
BufferedReader br = new BufferedReader(new InputStreamReader(f));
String record = br.readLine();
while (record != null) {
String[] strs = new String[record.length()];
strs = record.split(",");
TransactionRecord tr = new TransactionRecord();
tr.setbOrs(strs[0]);
tr.setUnit(Integer.parseInt(strs[1]));
tr.setPrice(Float.parseFloat(strs[2]));
ll.add(tr);
record = br.readLine();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
float cost = 0f, sum = 0f;
LinkedList lb = new LinkedList();
LinkedList ls = new LinkedList();
for (int i = 0; i < ll.size(); i++) {
TransactionRecord tr = (TransactionRecord) ll.get(i);
if (tr.getbOrs().equalsIgnoreCase("B")) {
cost += tr.getPrice() * tr.getUnit();
lb.add(tr);
} else if (tr.getbOrs().equalsIgnoreCase("S")) {
ls.add(tr);
}
}
for (int i = 0; i < ls.size(); i++) {
TransactionRecord tr = (TransactionRecord) ls.get(i);
for (int j = 0; j < lb.size(); j++) {
TransactionRecord trForS = ((TransactionRecord) ll.get(j));
if (tr.getUnit() > trForS.getUnit()) {
sum += trForS.getUnit()
* (tr.getPrice() - trForS.getPrice());
tr.setUnit(tr.getUnit() - trForS.getUnit());
trForS.setUnit(0);
} else if (tr.getUnit() < trForS.getUnit()) {
sum += tr.getUnit() * (tr.getPrice() - trForS.getPrice());
trForS.setUnit(trForS.getUnit() - tr.getUnit());
tr.setUnit(0);
} else {
sum += tr.getUnit() * (tr.getPrice() - trForS.getPrice());
}
}
}
DecimalFormat twoDForm = new DecimalFormat("#.##");
System.out.print("報酬率 = "
+ String.valueOf(twoDForm.format((sum / cost) * 100)) + "%");
}
}

class TransactionRecord {
String bOrs;
int unit;
float price;

public String getbOrs() {
return bOrs;
}

public void setbOrs(String bOrs) {
this.bOrs = bOrs;
}

public int getUnit() {
return unit;
}

public void setUnit(int unit) {
this.unit = unit;
}

public float getPrice() {
return price;
}

public void setPrice(float price) {
this.price = price;
}
}
-------------------------------
trans.txt format
前後不可有空白
-------------------------------
B,10,12.5
B,80,11
S,20,15
B,30,9
S,70,18