如何关闭您拥有的框架并在 JAVA 中打开一个新框架

Question

I want to open a new frame to show more details and for me to start on a new window like a new fresh page

here is my code:

public class OBA {

    public static void main(String[] args) {

        JFrame f = new JFrame("OBA");
        f.setSize(1366, 768);
        f.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
        f.setLayout(null);
        f.setVisible(true);

        JLabel l1 = null;
        JLabel l2 = null;
        JLabel l3 = null;
        l1 = new JLabel("Welcome");
        l1.setBounds(625, 100, 100, 100);
        l1.setFont(new Font("Courier New", Font.BOLD, 22));
        l1.setForeground(Color.BLACK);
        l2 = new JLabel("To", JLabel.CENTER);
        l2.setBounds(625, 100, 100, 150);
        l2.setFont(new Font("Courier New", Font.BOLD, 22));
        l2.setForeground(Color.BLACK);
        l3 = new JLabel("OBA", JLabel.CENTER);
        l3.setBounds(623, 100, 100, 200);
        l3.setFont(new Font("Courier New", Font.BOLD, 22));
        l3.setForeground(Color.BLACK);
        f.add(l1);
        f.add(l2);
        f.add(l3);
    }
}

Answer 1

You created a JFrame, f , so you know how to create a JFrame. To close that frame for good, you can call f.dispose() ; if you just want to hide it, call f.setVisible(false) . To open a new frame, do something like what you did to create f .

I don't know exactly why you want to do this, but if (as I've interpreted your question) you want to close the current window and immediately create a new one, in a lot of situations there's an easier way. In lieu of disposing one JFrame and creating another, you can keep the existing JFrame and remove whatever's already in it, such as with successive calls of f.remove() , one for each component you want gone. If you put your components in a LayoutManager instead of straight into the frame, you could put another LayoutManager in with f.setLayout() and swap everything out in one go, which might be easier.

For more information on JFrame, see the Oracle documentation .

Edit (in response to a comment): If you want to wait before changing what's shown, you need to use a method that causes a delay. java.lang.thread has a static method sleep() that does exactly this; to wait for five seconds, you can use Thread.sleep(5000); (since it accepts milliseconds). This method can throw an exception, though, if you interrupt the thread that's running sleep() . So you should wrap it in a try block:

try {
    Thread.sleep(5000);
} catch(InterruptedException ex) {
    // Your thread was interrupted (maybe the user quit the program?)
    // Handle that here.
}
f.remove(/* The element to remove goes here. */);
// Etc...

Of course, since this pauses the thread for five seconds, you should not call sleep() in a thread that handles things like user input, which could occur during those five seconds.

Oracle has documentation for this, too.

This is getting to be a different topic from that of the original question, but threads in Java (and in general) have lots of little intricacies that trip people up. If you need more help with sleep() or threading, you might want to ask a new question, or look for an existing one that relates to your problem.