我正在开发一个名为股市数据查看器的小项目。我现在卡住了。我有两个类：其中一个类从csv文件中读取和存储值。另一个是jframe类。我想如果我点击组合框中的项目，网址会被更改。我尝试了不同的方法似乎没有任何作用。下面是两个类的代码。
import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Scanner;
public class StockMarketViewerPanel {
private ArrayList<StoreData>csvarraylist;
public StockMarketViewerPanel(){
csvarraylist =new ArrayList<StoreData>();
}
public void getdata(){
try{
String Line;
StoreData store;
URL data = new URL("http://www.google.com/finance/historical?q="+symbol+"&histperiod=daily&startdate="Jan"+"1"+"2013 "&enddate=" Dec"+"31"+"2013 "&output=csv"););
Scanner s = new Scanner(data.openStream());
"http://www.google.com/finance/historical?q="+symbol+"&histperiod=daily&startdate="Jan"+"1"+"2013 "&enddate=" Dec"+"31"+"2013 "&output=csv");
s.nextLine(); // skip the first line
while(s.hasNextLine()){
Line = s.nextLine();
String[] csvdata = Line.split(",");
SimpleDateFormat df = new SimpleDateFormat("dd-MMM-yy");
Date newdate = null;
newdate = (Date)df.parse(csvdata[0]);
double open = Double.parseDouble(csvdata[1]);
double high = Double.parseDouble(csvdata[2]);
double low = Double.parseDouble(csvdata[3]);
double close = Double.parseDouble(csvdata[4]);
double volume = Double.parseDouble(csvdata[5]);
store = new StoreData(newdate,open,high,low,close,volume);
csvarraylist.add(store);
}
s.close();
printlist(csvarraylist);
} catch(MalformedURLException e) {
e.printStackTrace();
} catch (IOException e){
System.out.println("There is no such URL");
} catch (ParseException e) {
e.printStackTrace();
}
}
public void printlist(ArrayList<StoreData> Print) {
for (int i = 0; i < Print.size(); i++) {
System.out.println("Date:" + Print.get(i).getNewdate()
+ " , Open:" + Print.get(i).getOpen()
+ " , High:" + Print.get(i).getHigh()
+ " , Low:" + Print.get(i).getLow() + " , Volume:"
+ Print.get(i).getVolume() + "]");
}
}
}
the second class
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class MarketGUI extends JFrame {
private JButton graphviewer;
private TickerPanel selectticker;
public MarketGUI() {
setTitle ("Stock Market Data Viewer");
setSize(300, 300);
Container contentpane = this.getContentPane();
selectticker = new TickerPanel();
contentpane.add(selectticker);
JLabel companylabel = new JLabel("Select a Company:");
selectticker.add(companylabel, BorderLayout.WEST);
String[] companytickers = new String[] { "AAPL", "GOOGL","GOOG" };
// create a combo box with items
final JComboBox<String> company = new JComboBox<String>(companytickers);
selectticker.add(company, BorderLayout.EAST);
// Customizing the appearance of the combobox
company.setFont(new Font("Arial", Font.BOLD, 10));
company.setForeground(Color.BLUE);
company.setMaximumRowCount(10);
//Action Listener for the company combobox
company.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
}
});
JLabel startdate = new JLabel("Start Date:");
selectticker.add(startdate, BorderLayout.WEST);
String[] startdays = new String[] { "1", "2","3","4","5","6","7","8","9","10","11","12","13","14","15","16",
"17","18","19","20","21","22","23","24","25","26","27","28","29","30","31"};
// create a combo box with items
final JComboBox<String> dddate = new JComboBox<String>(startdays);
selectticker.add(dddate, BorderLayout.EAST);
// Customizing the appearance of the combobox
dddate.setFont(new Font("Arial", Font.BOLD, 10));
dddate.setForeground(Color.BLUE);
dddate.setMaximumRowCount(10);
//Action Listener for the company combobox
dddate.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
}
});
String[] startmonth = new String[] { "Jan", "Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec",};
// create a combo box with items
final JComboBox<String> months = new JComboBox<String>(startmonth);
selectticker.add(months, BorderLayout.EAST);
// Customizing the appearance of the combobox
months.setFont(new Font("Arial", Font.BOLD, 10));
months.setForeground(Color.BLUE);
months.setMaximumRowCount(10);
//Action Listener for the company combobox
months.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
}
});
String[] startyear = new String[] { "2001","2002","2003","2004","2005", "2006","2007","2008","2009","2010","2011","2012","2013","2014","2015","",};
// create a combo box with items
final JComboBox<String> years = new JComboBox<String>(startyear);
selectticker.add(years, BorderLayout.EAST);
// Customizing the appearance of the combobox
years.setFont(new Font("Arial", Font.BOLD, 10));
years.setForeground(Color.BLUE);
years.setMaximumRowCount(10);
//Action Listener for the company combobox
years.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
}
});
// iam now writing the java program for the END DATE comboboxes
JLabel enddate = new JLabel("End Date:");
selectticker.add(enddate, BorderLayout.WEST);
String[] enddays = new String[] { "1", "2","3","4","5","6","7","8","9","10","11","12","13","14","15","16",
"17","18","19","20","21","22","23","24","25","26","27","28","29","30","31"};
// create a combo box with items
final JComboBox<String> endday = new JComboBox<String>(enddays);
selectticker.add(endday, BorderLayout.SOUTH);
// Customizing the appearance of the combobox
endday.setFont(new Font("Arial", Font.BOLD, 10));
endday.setForeground(Color.BLUE);
endday.setMaximumRowCount(10);
//Action Listener for the company combobox
endday.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
}
});
String[] endmonth = new String[] { "Jan", "Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec",};
// create a combo box with items
final JComboBox<String> endmonths = new JComboBox<String>(endmonth);
selectticker.add(endmonths, BorderLayout.SOUTH);
// Customizing the appearance of the combobox
endmonths.setFont(new Font("Arial", Font.BOLD, 10));
endmonths.setForeground(Color.BLUE);
endmonths.setMaximumRowCount(10);
//Action Listener for the company combobox
endmonths.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
}
});
String[] endyear = new String[] { "2001","2002", "2003", "2004", "2005", "2006","2007","2008","2009","2010","2011","2012","2013","2014","2015","",};
// create a combo box with items
final JComboBox<String> endyears = new JComboBox<String>(endyear);
selectticker.add(endyears, BorderLayout.SOUTH);
// Customizing the appearance of the combobox
endyears.setFont(new Font("Arial", Font.BOLD, 10));
endyears.setForeground(Color.BLUE);
endyears.setMaximumRowCount(10);
//Action Listener for the company combobox
endyears.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
}
});
graphviewer = new JButton("Submit");
selectticker.add(graphviewer);
contentpane.add(selectticker, BorderLayout.EAST);
graphviewer.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
}
});
}
public static void main (String[]args) {
JFrame frm = new MarketGUI();
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setVisible(true);
}
}
答案 0 :(得分：0)
试试这个：
//Action Listener for the company combobox
company.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
URL data = new URL("whateveryouwant.com/example");
}
});