作爲this post的繼承,我遇到了導致我的計算機崩潰的無限循環。或者,並非如此:它似乎會導致Java窗口(JFrame)不斷聚焦/無限化地進行圖標化和標準化。因此不要嘗試像那樣運行代碼。該程序不會讓你關閉它,你也不能通過任務管理器來關閉它。JFrame中的無限消失 - 再現循環java
我已經給出了一個完整的代碼示例,您可以運行 - 正如通常所建議的那樣。由於它是實際程序的簡化版本,因此某些代碼可能看起來多餘(特別是中間的方法)。重要的方法是:最頂層(構造函數)和最後兩個。我猜測構造函數和/或方法有問題。
正如托馬斯指出的here,我把所有代碼放在構造函數的Runnable塊中,但我想我在那裏做了錯誤。
重要的是,在實際的程序,這個類沒有一個主要方法,但我調用類從另一個類,像這樣:
if(getInstance() == null) {
initOverview(0);
}
最後兩個窗口偵聽器被設置成使當用戶重新打開該窗口時,其內容被更新。
我一直在調查the documentation,但我無法弄清楚我的錯誤在哪裏。我是否使用Runnable示例錯誤?或者是因爲Window Listener和setExtendedState(以確保窗口的「打開」)相互觸發?如果是這樣,我怎麼解決這個問題?
另一個警告:不要執行這個代碼,它會讓你的電腦翻出
import javax.swing.*;
import java.awt.Color;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.lang.reflect.InvocationTargetException;
import java.awt.BorderLayout;
import java.awt.GridLayout;
public class OverviewTest extends JFrame {
private static final long serialVersionUID = 1L;
private static OverviewTest instance = null;
private static JLabel labelTextOverview;
private static JTabbedPane tabbedPane;
private static JPanel mapPane;
private OverviewTest() {
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
setTitle("Game - Overview");
setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
setResizable(true);
setBounds(100, 100, 960, 720);
JPanel contentPane = new JPanel();
setContentPane(contentPane);
contentPane.setLayout(new BorderLayout(0, 0));
tabbedPane = new JTabbedPane(JTabbedPane.TOP);
contentPane.add(tabbedPane);
/* TAB 1: Entity Overview */
labelTextOverview = new JLabel();
labelTextOverview.setText(entityOverviewHTML());
JScrollPane scrollPaneEntityOverview = new JScrollPane(labelTextOverview);
tabbedPane.addTab("Entity overview", null, scrollPaneEntityOverview, null);
/* TAB 2: Map */
mapPane = new JPanel();
mapPane.setLayout(new GridLayout(6, 6, 2, 2));
fillMap();
tabbedPane.addTab("Map", null, mapPane, null);
/* TAB 3: Rules */
JLabel labelRules = new JLabel();
labelRules.setText(rulesHTML());
JScrollPane scrollPaneRules = new JScrollPane(labelRules);
tabbedPane.addTab("Rules", null, scrollPaneRules, null);
// Immediately show window on creation
setVisible(true);
setExtendedState(JFrame.ICONIFIED);
setExtendedState(JFrame.NORMAL);
// Add window listener so that contents get refreshed on window active/focus
addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
setVisible(false);
}
@Override
public void windowActivated(WindowEvent e){
refresh(tabbedPane.getSelectedIndex());
}
@Override
public void windowDeiconified(WindowEvent e){
refresh(tabbedPane.getSelectedIndex());
}
});
}
});
} catch (InvocationTargetException | InterruptedException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
if(getInstance() == null) {
initOverview(0);
}
}
private String rulesHTML() {
StringBuilder sbRules = new StringBuilder();
sbRules.append("<html><body style='padding: 12px;'>");
sbRules.append("<h2>Some text for Rules</h2>");
sbRules.append("<h3>Lorem ipsum</h3>");
sbRules.append("</body></html>");
return sbRules.toString();
}
private static void fillMap() {
mapPane.removeAll();
for (int i = 0; i < 36; i++) {
JLabel textTile = new JLabel(fillTile(i));
JScrollPane tile = new JScrollPane(textTile);
tile.setBorder(BorderFactory.createLineBorder(Color.BLACK));
mapPane.add(tile);
}
}
private static String fillTile(int i) {
StringBuilder sbTile = new StringBuilder();
sbTile.append("<html>");
sbTile.append("some text");
sbTile.append("</html>");
return sbTile.toString();
}
/**
* Reset UI components to system default
*/
public static void initOverview(int index) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}
catch (UnsupportedLookAndFeelException | ClassNotFoundException | InstantiationException | IllegalAccessException e) {
System.err.println(e);
}
instance = new OverviewTest();
tabbedPane.setSelectedIndex(index);
}
public static OverviewTest getInstance() {
return instance;
}
private static String entityOverviewHTML() {
StringBuilder sb = new StringBuilder();
sb.append("<html><body style='padding: 12px;'>");
sb.append("<h2>Some text for Rules</h2>");
sb.append("<h3>Lorem ipsum</h3>");
// Normally a loop that runs over getEntityInfo();
sb.append(getEntityInfo());
sb.append("</body></html>");
return sb.toString();
}
private static StringBuilder getEntityInfo() {
StringBuilder sbInfo = new StringBuilder();
sbInfo.append("this is not a drill, but a test");
return sbInfo;
}
private static void bringToFront() {
getInstance().setVisible(true);
getInstance().setExtendedState(JFrame.ICONIFIED);
getInstance().setExtendedState(JFrame.NORMAL);
}
public static void refresh(int index) {
labelTextOverview.setText(entityOverviewHTML());
fillMap();
tabbedPane.setSelectedIndex(index);
getInstance().repaint();
bringToFront();
}
}
嗯,我想我看到了這對SO某處,但我似乎無法找到位置。你知道爲什麼會發生這種情況嗎? –
編輯來解釋爲什麼發生無限循環。 –
我現在明白爲什麼。首先進行圖標化,然後正常化,確保窗口在前面處於打開狀態並處於活動狀態。現在,在你的調整中,窗口是激活的(它在任務欄中閃爍),但它不在前面。如果這個功能可以保留,這將是很好的。 –