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POMake a main method wait on a smaller method (java)
 

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    <p>i really need to find better ways to word my questions. Basically I've created a program that takes information from a webpage and displays it nicely across the screen.</p> <p>When the user closes the program, they actually hide it. </p> <p>I also have another method which constantly loops checking for information to see if tis been updated. unfortunately the problem im having is that it loops to fast, i only want it to check for information every 40 seconds or so.</p> <p>What i tried was inserting a wait(1000,1000) in the method itself and in the main of the program. but both of these cause IllegalMonitorStateException.</p> <p>Is this the correct way to make the thread wait properly? or is there a better way? note: the only thread i have is the main.</p> <p>MAIN</p> <pre><code>class Marquee { public static void main(String[] args) throws InterruptedException { MyFrame frame = new MyFrame(); frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE); frame.setVisible(true); frame.setAlwaysOnTop(true); frame.setBackground(Color.BLACK); frame.setResizable(true); while(true) { // this doesnt work frame.wait(1000,1000); frame.notifyAll(); frame.checkForNewUpdate(); System.out.println(" ____________________________next line _______________________________"); } } } </code></pre> <p>CHECK FOR UPDATES</p> <pre><code>public String[] checkForNewUpdate() { //setVisible(true); String tempUpdate = getEngineersUpdate(); if (latestUpdate[0] != tempUpdate) { // do nothign setVisible(false); } else if(latestUpdate[0]==tempUpdate) { latestUpdate[0] = tempUpdate; //show the page again setVisible(true); } else if(latestUpdate[0]!= "NULL") { // do nothing //latestUpdate[0] = tempUpdate; } else { latestUpdate[0] = tempUpdate; } return latestUpdate; } </code></pre> <p>1: WHat am i doing wrong to get this exception</p> <p>2: Is there any other way to make a gap of time in a method</p> <p>3: Am i going to have to put all these methods into another thread? Please say no</p> <hr> <pre><code>// my constructor which I failed to mention has a timer in it. only i dont know hwo to use it class MyFrame extends JFrame implements ActionListener { private ActionListener listener; private Timer t1; private String [] latestUpdate = new String[1]; public MyFrame() { Dimension d = Toolkit.getDefaultToolkit().getScreenSize();// gets the maximum size of the screen setSize(d.width,(d.height/100)*10);//sets it to max. need to change this // this shit find the max size of screen and puts it bottom left GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); GraphicsDevice defaultScreen = ge.getDefaultScreenDevice(); Rectangle rect = defaultScreen.getDefaultConfiguration().getBounds(); int x = (int)rect.getMinX(); int y = (int)rect.getMaxY()-getHeight(); setLocation(x,y-30); setTitle("ALERT::OUTAGE"); MyPanel panel = new MyPanel(); add(panel); listener = this; t1 = new Timer(50,listener); t1.start(); } </code></pre> <p>by request, here is getEngineersUpdate()</p> <pre><code>public String getEngineersUpdate() //gets data from page and sets it to string. { String update = "blank"; final WebClient webClient = new WebClient(); webClient.setJavaScriptEnabled(false);// javascript causes some serious problems. webClient.setCssEnabled(false); String forChecking; HtmlPage page; try { URL outageURL = new URL("file:\\C:\\Users\\0vertone\\Desktop\\version control\\OUTAGE\\Outages.html"); //local drive at home page = webClient.getPage(outageURL); //All this crap can be gone if we just give the table an id Object[] dates = page.getByXPath("//span[@id='date']/text()").toArray(); Object[] sites = page.getByXPath("//span[@id='site']/text()").toArray(); Object[] issues = page.getByXPath("//span[@id='issue']/text()").toArray(); System.out.println("" + dates[0].toString()); System.out.println("" + sites[0].toString()); System.out.println("" + issues[0].toString()); update = (dates[0].toString() + " " + sites[0].toString() + " " +issues[0].toString()); forChecking = dates[0].toString(); /**some examples of the getCellAt() method*/ //update = table.getCellAt(0,0).asText(); // This returns DATE/Time //update = table.getCellAt(1,0).asText(); // This return the actual date //update = table.getCellAt(0,1).asText(); // This returns, SITE/Sector //update = table.getCellAt(1,1).asText(); // This returns the actual site issue } catch (FailingHttpStatusCodeException a) { System.out.println("Failing HTTP Status Execution"); a.printStackTrace(); } catch (MalformedURLException b) { System.out.println("Malformed URL"); b.printStackTrace(); } catch (IOException c) { System.out.println("IO PROBLEMS!"); c.printStackTrace(); } webClient.closeAllWindows(); return update; } </code></pre>
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      1. POMake a main method wait on a smaller method (java)
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    1. COAll calls related to the GUI should occur in the Swing event dispatch thread (EDT). Look at SwingUtilities.invokeLater or do a web search for details. Even though you appear to only have one thread the EDT is running as it is started by creating the GUI. You are also using == to compare Strings, use string.equals(otherString) instead.
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      1. POMake a main method wait on a smaller method (java)
      1. USRuss Hayward
    2. COyou do use swing, so main isn't the only thread you have. There is at least the Event Dispatching Thread
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      1. POMake a main method wait on a smaller method (java)
      1. USOlivier Heidemann
 

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