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POswing window getting frozen ,not displaying content
 

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    <pre><code>public class Main extends JFrame{ JLabel lb1,lb2,lb3,lb4; Button b,b1; public Main() { setLayout(null); Container c=getContentPane(); setDefaultCloseOperation(EXIT_ON_CLOSE); getContentPane().setBackground(Color.red); setVisible(true); b1=new Button("CONTINUE"); b1.setFont(new Font("Algerian", 1, 20)); b1.setForeground(Color.black); b1.setBounds(550, 480, 200,40); b1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { setVisible(false); try { new Frame(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); c.add(b1); setSize(1290,900); } public static void main(String...s) throws InterruptedException { new Main(); } } </code></pre> <p>this is the main class..and this the frame class that it calls..</p> <pre><code>public class Frame extends JFrame{ Frame() throws InterruptedException { JFrame f=new JFrame(); f.setVisible(true); f.setLayout(null); f.setBounds(0,0,200,200); Container p=f.getContentPane(); p.setBackground(Color.GREEN); f.setResizable(false); Thread.sleep(5000); setVisible(false); new Frame1(); } } </code></pre> <p>the main class calls the frame class..that needs to hold for a certain time and then move to another frame.. but what happens is that the main class calls it, the frame appears , but there is no content in it..nothing is displayed.then it moves to frame1()//</p> <p>but if i run like</p> <blockquote> <p>new Frame();</p> </blockquote> <p>then it holds ,shows content , and then moves..</p> <p>so why doesnt it work when Frame() is called by Main() ?</p> <p>even this code doesnt' work ..instead of Thread.sleep()...this way i am not blocking any even thread..am i ?</p> <pre><code>for(double i=0;i&lt;30;i++) { for(double j=0;j&lt;10000;j++) { } } </code></pre> <p>new Frame1();</p>
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    1. CODon't block the EDT (Event Dispatch Thread) - the GUI will 'freeze' when that happens. Instead of calling `Thread.sleep(n)` implement a Swing `Timer` for repeating tasks or a `SwingWorker` for long running tasks. See [Concurrency in Swing](http://docs.oracle.com/javase/tutorial/uiswing/concurrency/) for more details.
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      1. USAndrew Thompson
    2. CO.. 2) A single blank line of white space in source code is *always* enough. Blank lines after `{` or before `}` are also typically redundant. 3) Don't set the size of top level containers. Instead layout the content & call `pack()`. 4) See [The Use of Multiple JFrames, Good/Bad Practice?](http://stackoverflow.com/a/9554657/418556)
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      1. USAndrew Thompson
    3. COby freezing , u mean it will freeze with its content displayed? because that is exactly what i am aiming for.the Frame() is supposed to display a message window for 4-5 seconds and then move to Frame1()//
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