java 使用 for 循环遍历对象和方法列表
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Iterate through list of objects & methods using for loop
提问by user1251814
The entirety of the code can be found at the bottom of this post, but the only part that really concerns me is,
整个代码可以在这篇文章的底部找到，但唯一真正让我担心的部分是，
for(zed = 0; zed<photoes.size(); zed++) {
totesPrice += photoes<zed>.getCost();
totesSize += photoes<zed>.getMegabytes();
totesSpeed = photoes<zed>.getSpeed();
}
Ideally the totesPrice, totesSize, and totesSpeed would be the sum of the get methods for the objects stored in the photoes list array.
理想情况下，totesPrice、totesSize 和 totesSpeed 将是存储在 photoes 列表数组中的对象的 get 方法的总和。
// Import classes for class
import java.util.Arrays;
import java.util.List;
import javax.swing.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import java.util.ArrayList;
public class DigitalMain
{
public static void main(String args[])
{
String cont = "Y";
String heightString,width,bitpsString = "";
String widthString = "";
int zed;
double bitps,pHS,pWS = 0.0;
double totesSpeed = 0.0;
double totesPrice = 0.0;
double totesSize = 0.0;
DecimalFormat wholeDigits = new DecimalFormat("0");
DecimalFormat dec = new DecimalFormat("0.00");
List<DigitalPhoto> photoes = new ArrayList<DigitalPhoto>();
do
{
DigitalPhoto photo = new DigitalPhoto();
heightString = JOptionPane.showInputDialog("Please enter height");
pHS = Double.parseDouble(heightString);
photo.setHeight(pHS);
widthString = JOptionPane.showInputDialog("Please enter width");
pWS = Double.parseDouble(widthString);
photo.setWidth(pWS);
JOptionPane.showMessageDialog(null, "Height: " + photo.getHeight() + "\nWidth: " + photo.getWidth() + "\nResolution: " + photo.getResolution() + " DPI\nCompression Ratio: " + photo.getCompression() + "\nRequired Storage: " + dec.format(photo.getKilo()) + " Kilobytes.\nPrice of Scanned Photo: $" + dec.format(photo.getCost()) + " dollars.");
do
{
bitpsString = JOptionPane.showInputDialog("Please enter your internet connection speed in BITS not BYTES please.");
bitps = Double.parseDouble(bitpsString);
} while (bitps < 0 && bitps > 99999999);
photo.setSpeed(bitps);
for(zed = 0; zed<photoes.size(); zed++) {
totesPrice += photoes<zed>.getCost();
totesSize += photoes<zed>.getMegabytes();
totesSpeed = photoes<zed>.getSpeed();
}
cont = JOptionPane.showInputDialog("\nType \'Y\' to try again or anything but \'Y\' to use values.");
photoes.add(photo);
} while (cont.equalsIgnoreCase("Y"));
double seconds = transferTime(totesSize, totesSpeed);
double minutes = seconds / 60;
double realsec = seconds % 60;
JOptionPane.showMessageDialog(null, "You will be paying: " + totesPrice + "\nRequired Storage is: " + totesSize + "Required time for transfer is: " + wholeDigits.format(minutes) + " minutes, and " + wholeDigits.format(realsec) + " seconds.");
}
public static double transferTime(double totalStorage, double netSpeed) {
double bits, seconds;
bits = (totalStorage * 8);
seconds = (bits / netSpeed);
return seconds;
};
}
回答by Sumit Singh
回答by Mihai Andrei Rustiuc
You could use an Iterator instead :
您可以改用迭代器：
Iterator it = photoes.iterator();
while(it.hasNext())
{
DigitalPhoto temp = it.next();
totesPrice += temp.getCost();
totesSize += temp.getMegabytes();
totesSpeed = temp.getSpeed();
}
回答by Ravi Jain
for(zed = 0; zed<photoes.size(); zed++)
{
totesPrice += photoes.get(zed).getCost();
totesSize += photoes.get(zed).getMegabytes();
totesSpeed = photoes.get(zed).getSpeed();
}
Try this.
试试这个。
