jframe

How can I get the JFrame in which a JPanel is living? My current solution is to ask the panel for it's parent (and so on) until I find a Window: Container parent = this; // this is a JPanel do { parent = parent.getParent(); } while (!(parent instanceof Window) && parent != null); if (parent != null) { // found a parent Window } Is there a more elegant way, a method in the Standard Library may be? You could use SwingUtilities.getWindowAncestor(...) method that will return a Window that you could cast to your top level type. JFrame topFrame = (JFrame) SwingUtilities.getWindowAncestor(this);

I am learning Java gui. The way I learnt to create a window is to inherit or Extend JFrame class and it is good to use it, as JFrame contains all the properties of a Window. Now If I want to add something to this window, I need to use add() method. But Today I came across JPanel which also creates a windows and we can add stuff by jpanelObjec.add() . What is the difference between the two methods? Are they somehow related? You should not extend the JFrame class unnecessarily (only if you are adding extra functionality to the JFrame class) JFrame : JFrame extends Component and Container . It is

I have two JFormattedTextField objects on my JFrame object. I want a basic Math (addition) by the values of these JFormattedTextField objects. I want it happen when focus lost either the first or the second textfield. But when " focusLost() ", event doesn't get the last value, it gets the previous value. For example; tf1 has 0 and tf2 has 0 at first. I write 2 to tf1 , and when focusLost() , result ( tf1+tf2 ) become still 0. when I change any of them, the result becomes 2 (the previous value) How do I get the last values on focusLost? Here is my code: JFormattedTextField tf1,tf2; NumberFormat

public void myMethod { MyProgessBarFrame progFrame = new MyProgressBarFrame(); // this is a JFrame progFrame.setVisible(true); // show my JFrame loading // do some processing here while the progress bar is running // ..... progFrame.setvisible(false); // hide my progress bar JFrame } // end method myMethod I have the code above. But when I run it, the do some processing section does not process until I close the progress bar JFrame. How will I show my progress bar and tell Java to continue in the do processing section? You've got a classic problem with concurrency and Swing. Your problem is

I am developing a swing application. I am using two screens 1.A button from screen1 will launch screen 2. PseudoCode : ScreenA extends JFrame{ onButtonClick(){ Screen2.setVisible(true); } System.out.println("Hai"); } Screen2 extends JFrame{ onButtonClick{ Hide this screen; } } Now the output is : The screen 2 will be displayed 2.Hai will be printed. My Objective : I want to display hai only when a button from screen 2 is clicked and screen 2 dissppears. How do i achieve it ? I tried setting a flag for buttonclicked in screen two. But the program just passes through the condition and goes on to