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Thread: while looping a swing worker does not display results on jtable?

  1. #1
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    Default while looping a swing worker does not display results on jtable?

    hi,
    I am using swing worker to update my GUI in edt. I have the code below. when I run the code without the while loop it works,
    whereas when I run with the while loop it falis , why is it so ?

     
    import java.awt.BorderLayout;
    import java.awt.EventQueue;
    import java.util.List;
    import java.util.Scanner;
    import java.util.Vector;
    import java.util.concurrent.ExecutionException;
     
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JScrollPane;
    import javax.swing.JTable;
    import javax.swing.SwingWorker;
    import javax.swing.table.DefaultTableModel;
    import javax.swing.table.TableModel;
     
    public class App 
    { 	 
    	     static JFrame frame = new JFrame("Random Data Demo");
    	     static JTable table =  new JTable();
    	     static DefaultTableModel tableModel = new DefaultTableModel();
    	 	 static Scanner sc=new Scanner(System.in);
     
    	   public static void main(String[] args) throws Exception {
    	        EventQueue.invokeLater(new Runnable() {
    	            @Override
    	            public void run() 
    	            {            	
    	               while(true)                                                     ////// while loop ---
    	               {
     
    	            	System.out.println("Write message here: ");									
    	     			String message = sc.nextLine();
    	     			System.out.println("Message is: "+message);
     
    	            	Swingwor mainWorker = new Swingwor(table,message);
    	                mainWorker.execute(); 
     
    	                init();
     
    	               }
    	            }
    	        });
    	    }
     
    	   private static void init() {
    		   //execTask();
    		 // JFrame frame = new JFrame("Random Data Demo");
    	       frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    	      frame.setSize(600,600);
     
    	    //	DefaultTableModel model = new DefaultTableModel();
    	    	//JTable table =  new JTable(model);
    	    	table.setModel(tableModel);
     
    	    	table.repaint();
    	    	JScrollPane scrollPane = new JScrollPane(table);
     
    	    	JPanel panel = new JPanel(new BorderLayout());
    	    	//Swingworker mainWorker = new Swingworker(table);
               // mainWorker.execute();
     
    	    	panel.add(table.getTableHeader(), BorderLayout.PAGE_START);
    	    	panel.add(scrollPane, BorderLayout.CENTER);
    	    	//getContentPane().add(panel);
                  frame.add(panel);
    	          frame.setVisible(true);
    	    }
     
    	 //  private static void execTask() 
    	  // {	  
    		//   Swingwor mainWorker = new Swingwor(table);
    	//	   mainWorker.execute(); 
     
       //   }
    }
     
     
    class Swingwor extends SwingWorker<TableModel,TableModel>
    {
     
    	Object data[][]=null;
        private final JTable table;
        int i,r;
        String p;
        String message=null;
        Object col[] = {"Sensor","Values","Arrival_Time","Status",""};
     
        public Swingwor(JTable table, String message) {
            this.table = table;
            this.message = message;
        }    
        @Override
        protected TableModel doInBackground() throws Exception 
        {     	   	
    			if(!message.equals("ITS EMPTY"))
    			{
    				String[] parts = message.split("\t");
    		            data = new Object[parts.length / 4][5];
    				for (i = 0, r = 0; r < data.length; r++) 
    				{                        	  						
    					data[r][0] =  parts[i++];
    				   //data[r][1] =  new Double(parts[i++]) ;
    				    data[r][1] =  parts[i++] ;
    				    data[r][2] = parts[i++];
    				    data[r][3] = parts[i++];
    				    p=(String) data[r][3];
    				   // w = (String) abc(p);
    				    data[r][4]=Boolean.parseBoolean(p) ;
    				  System.out.println(data[r][4]);
    				}               
    				//System.out.println(java.util.Arrays.deepToString(data));
                 //Display Table     
                      }
    			DefaultTableModel tableModel = new DefaultTableModel(data, col);
    	        tableModel.setDataVector(data, col);
    			 return tableModel;
              }
     
     
        @Override
        protected void done() {
            try {
                TableModel model = get();
                table.setModel(model);
            } catch (InterruptedException | ExecutionException ex) {
                ex.printStackTrace();
            }
        }
     
     
     
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: while looping a swing worker does not display results on jtable?

    it falis
    Please explain what "it fails" means? What happens when the code executes?
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: while looping a swing worker does not display results on jtable?

    fails means : IT dosn't show the values in the jtable... The program executes without errors. input is also given,but the input is not shown in jtable

    --- Update ---

    u can try executing the program ..

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: while looping a swing worker does not display results on jtable?

    Why is setModel() called in 2 places? One call is with an empty model.

    Why the loop in run() that is creating panel each time around the loop?
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: while looping a swing worker does not display results on jtable?

    Quote Originally Posted by Norm View Post
    Why is setModel() called in 2 places? One call is with an empty model.

    Why the loop in run() that is creating panel each time around the loop?
    oh !! I again modified the code,solving the above problem.. But still no result ??

    import java.awt.BorderLayout;
    import java.awt.EventQueue;
    import java.util.List;
    import java.util.Scanner;
    import java.util.Vector;
    import java.util.concurrent.ExecutionException;
     
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JScrollPane;
    import javax.swing.JTable;
    import javax.swing.SwingWorker;
    import javax.swing.table.DefaultTableModel;
    import javax.swing.table.TableModel;
     
    public class App 
    { 	 
    	     static JFrame frame = new JFrame("Random Data Demo");
    	     static JTable table =  new JTable();
    	 	static JPanel panel = new JPanel(new BorderLayout());
    	     static DefaultTableModel tableModel = new DefaultTableModel();
    	 	 static Scanner sc=new Scanner(System.in);
     
    	   public static void main(String[] args) throws Exception {
    	           EventQueue.invokeLater(new Runnable() {
    	            @Override
    	            public void run() 
    	            {     
    	              while(true)
    	              {
    	            	Swingwor mainWorker = new Swingwor(table);
    	                mainWorker.execute(); 
     
     
    	                init();
    	                try {
    						Thread.sleep(10000);
    					} catch (InterruptedException e) {
    						// TODO Auto-generated catch block
    						e.printStackTrace();
    					}
    	              }
    	            	}            
    	        });
    	    }
     
    	   private static void init() {
    		   //execTask();
    		 // JFrame frame = new JFrame("Random Data Demo");
    	       frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    	      frame.setSize(600,600);
     
    	    //	DefaultTableModel model = new DefaultTableModel();
    	    	//JTable table =  new JTable(model);
    	    	//table.setModel(tableModel);
     
    	    	table.repaint();
    	    	JScrollPane scrollPane = new JScrollPane(table);
     
     
    	    	//Swingworker mainWorker = new Swingworker(table);
               // mainWorker.execute();
     
    	    	panel.add(table.getTableHeader(), BorderLayout.PAGE_START);
    	    	panel.add(scrollPane, BorderLayout.CENTER);
    	    	//getContentPane().add(panel);
                  frame.add(panel);
    	          frame.setVisible(true);
    	    }
     
    	 //  private static void execTask() 
    	  // {	  
    		//   Swingwor mainWorker = new Swingwor(table);
    	//	   mainWorker.execute(); 
     
       //   }
    }
     
     
    class Swingwor extends SwingWorker<TableModel,TableModel>
    {
     
    	Object data[][]=null;
        private final JTable table;
        int i,r;
        String p;
    	 static Scanner sc=new Scanner(System.in);
        String message=null;
        Object col[] = {"Sensor","Values","Arrival_Time","Status",""};
     
        public Swingwor(JTable table) {
            this.table = table;
         //   this.message = message;
        }    
        @Override
        protected TableModel doInBackground() throws Exception 
        {     	
        	    System.out.println("Write message here: ");									
    			String message = sc.nextLine();
    			System.out.println("Message is: "+message);
     
    			if(!message.equals("ITS EMPTY"))
    			{
    				String[] parts = message.split("\t");
    		            data = new Object[parts.length / 4][5];
    				for (i = 0, r = 0; r < data.length; r++) 
    				{                        	  						
    					data[r][0] =  parts[i++];
    				   //data[r][1] =  new Double(parts[i++]) ;
    				    data[r][1] =  parts[i++] ;
    				    data[r][2] = parts[i++];
    				    data[r][3] = parts[i++];
    				    p=(String) data[r][3];
    				   // w = (String) abc(p);
    				    data[r][4]=Boolean.parseBoolean(p) ;
    				  System.out.println(data[r][4]);
    				}               
    				//System.out.println(java.util.Arrays.deepToString(data));
                 //Display Table     
                      }
     
    			DefaultTableModel tableModel = new DefaultTableModel(data, col);	
    	        tableModel.setDataVector(data, col);
    	        publish(tableModel);
     
    			 return tableModel;
        }
     
     
        @Override
        protected void process(List<TableModel> chunks)
        {
        	TableModel model = null;
    		try {
    			model = get();
    		} catch (InterruptedException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		} catch (ExecutionException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
            table.setModel(model);
        }
     
        @Override
        protected void done() {
            try {
                TableModel model = get();
                table.setModel(model);          
            } catch (InterruptedException | ExecutionException ex) {
                ex.printStackTrace();
            }
        }
     
     
     
    }


    --- Update ---

    norm : is it something that the loop is busy executing the job,thats y its not able to update the GUI ??

  6. #6

  7. #7
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    Default Re: while looping a swing worker does not display results on jtable?

    loop is busy executing the job,thats y its not able to update the GUI
    If the loop is executing using the EDT's thread, the GUI won't be updated until the code using that thread returns it to the JVM.

    To see what thread is being used add a println statement to print out the value of Thread.currentThread() in all the methods being called.
    If you don't understand my answer, don't ignore it, ask a question.

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