我正在关注Stockwatcher教程。
当我尝试运行它时，出现此错误？:“此行有多个标记”(我在下面的行中添加了注释)。
package com.google.gwt.sample.stockwatcher.client;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.Random;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import java.util.ArrayList;
public class StockWatcher implements EntryPoint {
private static final int REFRESH_INTERVAL = 5000;
private VerticalPanel mainPanel = new VerticalPanel();
private FlexTable stocksFlexTable = new FlexTable();
private HorizontalPanel addPanel = new HorizontalPanel();
private TextBox newSymbolTextBox = new TextBox();
private Button addStockButton = new Button("Add");
private Label lastUpdatedLabel = new Label();
private ArrayList<String> stocks = new ArrayList<String>();
/**
* Entry point method.
*/
public void onModuleLoad() {
// Create table for stock data.
stocksFlexTable.setText(0, 0, "Symbol");
stocksFlexTable.setText(0, 1, "Price");
stocksFlexTable.setText(0, 2, "Change");
stocksFlexTable.setText(0, 3, "Remove");
// Assemble Add Stock panel.
addPanel.add(newSymbolTextBox);
addPanel.add(addStockButton);
// Assemble Main panel.
mainPanel.add(stocksFlexTable);
mainPanel.add(addPanel);
mainPanel.add(lastUpdatedLabel);
// Associate the Main panel with the HTML host page.
RootPanel.get("stockList").add(mainPanel);
// Move cursor focus to the input box.
newSymbolTextBox.setFocus(true);
// Setup timer to refresh list automatically.
Timer refreshTimer = new Timer() {
@Override
public void run() {
refreshWatchList();
}
};
refreshTimer.scheduleRepeating(REFRESH_INTERVAL); //THIS IS THE LINE OF THE
// Listen for mouse events on the Add button.
addStockButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
addStock();
}
});
// Listen for keyboard events in the input box.
newSymbolTextBox.addKeyPressHandler(new KeyPressHandler() {
public void onKeyPress(KeyPressEvent event) {
System.out.println("foo=" + KeyCodes.KEY_ENTER);
System.out.println("bar=" + (int)event.getCharCode());
if (event.getCharCode() == KeyCodes.KEY_ENTER) {
addStock();
}
}
});
}
/**
* Add stock to FlexTable. Executed when the user clicks the addStockButton or
* presses enter in the newSymbolTextBox.
*/
private void addStock() {
final String symbol = newSymbolTextBox.getText().toUpperCase().trim();
newSymbolTextBox.setFocus(true);
// Stock code must be between 1 and 10 chars that are numbers, letters, or dots.
if (!symbol.matches("^[0-9A-Z\\.]{1,10}$")) {
Window.alert("'" + symbol + "' is not a valid symbol.");
newSymbolTextBox.selectAll();
return;
}
newSymbolTextBox.setText("");
// Don't add the stock if it's already in the table.
if (stocks.contains(symbol))
return;
// Add the stock to the table.
int row = stocksFlexTable.getRowCount();
stocks.add(symbol);
stocksFlexTable.setText(row, 0, symbol);
// Add a button to remove this stock from the table.
Button removeStockButton = new Button("x");
removeStockButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
int removedIndex = stocks.indexOf(symbol);
stocks.remove(removedIndex); stocksFlexTable.removeRow(removedIndex + 1);
}
});
stocksFlexTable.setWidget(row, 3, removeStockButton);
// Get the stock price.
refreshWatchList();
}
private void refreshWatchList() {
final double MAX_PRICE = 100.0; // $100.00
final double MAX_PRICE_CHANGE = 0.02; // +/- 2%
StockPrice[] prices = new StockPrice[stocks.size()];
for (int i = 0; i < stocks.size(); i++) {
double price = Random.nextDouble() * MAX_PRICE;
double change = price * MAX_PRICE_CHANGE
* (Random.nextDouble() * 2.0 - 1.0);
prices[i] = new StockPrice(stocks.get(i), price, change);
}
updateTable(prices);
}
/**
* Update the Price and Change fields all the rows in the stock table.
*
* @param prices Stock data for all rows.
*/
private void updateTable(StockPrice[] prices) {
for (int i = 0; i < prices.length; i++) {
updateTable(prices[i]);
}
}
/**
* Update a single row in the stock table.
*
* @param price Stock data for a single row.
*/
private void updateTable(StockPrice price) {
// Make sure the stock is still in the stock table.
if (!stocks.contains(price.getSymbol())) {
return;
}
int row = stocks.indexOf(price.getSymbol()) + 1;
// Format the data in the Price and Change fields.
String priceText = NumberFormat.getFormat("#,##0.00").format(
price.getPrice());
NumberFormat changeFormat = NumberFormat.getFormat("+#,##0.00;-#,##0.00");
String changeText = changeFormat.format(price.getChange());
String changePercentText = changeFormat.format(price.getChangePercent());
// Populate the Price and Change fields with new data.
stocksFlexTable.setText(row, 1, priceText);
stocksFlexTable.setText(row, 2, changeText + " (" + changePercentText
+ "%)");
}
}
这是一堆错误:
StockWatcher [Web Application]
com.google.gwt.dev.DevMode at localhost:56938
Thread [main] (Running)
Thread [Thread-1] (Running)
Daemon Thread [Thread-2] (Running)
Daemon Thread [UnitWriteThread] (Running)
Daemon Thread [Timer-0] (Running)
Daemon Thread [Code server listener] (Running)
Daemon Thread [com.google.gwt.thirdparty.guava.common.base.internal.Finalizer] (Running)
Thread [2048426764@qtp-774727454-1 - Acceptor0 [email protected]:8888] (Running)
Thread [2108438076@qtp-774727454-0] (Running)
Daemon Thread [Timer-1] (Running)
Daemon Thread [Code server for stockwatcher from Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1 on http://127.0.0.1:8888/StockWatcher.html?gwt.codesvr=127.0.0.1:9997 @ 1hS?FL4(4E4"'T^J] (Suspended (breakpoint at line 67 in StockWatcher))
StockWatcher.onModuleLoad() line: 67
NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method]
NativeMethodAccessorImpl.invoke(Object, Object[]) line: 57
DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43
Method.invoke(Object, Object...) line: 601
ModuleSpaceOOPHM(ModuleSpace).onLoad(TreeLogger) line: 396
OophmSessionHandler.loadModule(BrowserChannelServer, String, String, String, String, String, byte[]) line: 200
BrowserChannelServer.processConnection() line: 525
BrowserChannelServer.run() line: 363
Thread.run() line: 722
/usr/lib/jdk1.7.0_01/bin/java (Nov 22, 2011 12:45:50 PM)
哈维
最佳答案
您的错误列表沟通不多。它只是说“(已挂起(StockWatcher中的第67行的断点))”，这是您手动停止该过程。如果失败，将其粘贴。
无论如何，我在特定行中看不到任何问题。可能会使编译器混乱的一件事是额外的(或{，否则，请尝试清理项目，擦除GWT生成的代码并重建。
关于java - “Multiple markers at this line”，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/8225777/