Thread: JInternalFrame Only Show one Window

Window1 is JInternalFrame
I want when the menu item is clicked, the JInternalFrame only can show one window, if we click the menu item again, i will detect that JInternalFrame is exist, how to do that?

Here is my code :

    private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {                                           
        // TODO add your handling code here:
        Window1 frm1 = new Window1();
        if (frm1.isShowing()) {
            JOptionPane.showMessageDialog(null, "yo");
        } else {
            desktopPane.add(frm1);
            frm1.show();
        }
    }

it still showing new Window everytime i click the menu item

Originally Posted by sadaharu

it still showing new Window everytime i click the menu item

That is what the code says to do. thing t = new thing;
if you don't want a new one each time don't make a new one each time, keep a reference to the old one

Originally Posted by jps

That is what the code says to do. thing t = new thing;
if you don't want a new one each time don't make a new one each time, keep a reference to the old one

how to keep it as it old one dude?

In the posted method, frm1 is declared as a local variable. (Defined within the scope of the method)

Any variable created within a method is garbage when the method returns. (Either by hitting a return statement or reaching the } closing the method)

Declare the variable as a class variable. Check the link and post any questions you may have left