answer for 維克諾

[Steven_Tian]

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

public class StockTransaction {

public static void main(String[] args) {
LinkedList ll = new LinkedList();
TransactionRecord tr1 = new TransactionRecord();
tr1.setbOrs("B");
tr1.setUnit(10);
tr1.setPrice(12.5f);
TransactionRecord tr2 = new TransactionRecord();
tr2.setbOrs("B");
tr2.setUnit(80);
tr2.setPrice(11f);
TransactionRecord tr3 = new TransactionRecord();
tr3.setbOrs("S");
tr3.setUnit(20);
tr3.setPrice(15f);
TransactionRecord tr4 = new TransactionRecord();
tr4.setbOrs("B");
tr4.setUnit(30);
tr4.setPrice(9f);
TransactionRecord tr5 = new TransactionRecord();
tr5.setbOrs("S");
tr5.setUnit(70);
tr5.setPrice(18f);
ll.add(tr1);
ll.add(tr2);
ll.add(tr3);
ll.add(tr4);
ll.add(tr5);
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() == "B") {
cost += tr.getPrice() * tr.getUnit();
lb.add(tr);
} else if (tr.getbOrs() == "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;
}
}