How to check if a jframe is opened?

Question

My code below create a new array and sends it to chat(jFrame).

String info1[]=new String[3];
 // username , userid , userid2 are variables
 info1[0]=username4;
 info1[1]=""+userid;
 info1[2]=""+userid2;

 chat.main(info1);

But i need to modify this code to work such a way that it , if the chat jframe was opened, then dont open a new jFrame .But instead open a new tab in chat jframe . The code for chat frame is :

private void formWindowActivated(java.awt.event.WindowEvent evt) {       
  JScrollPane panel2 = new JScrollPane();
  JTextArea ta=new JTextArea("");
  ta.setColumns(30);
  ta.setRows(19);
  panel2.setViewportView(ta);
  jTabbedPane1.add("Hello", panel2);   
}

I swear to god I saw this same question earlier today. Have you tried searching this? — Tdorno, Jul 01 '13 at 04:28
See also - [The Use of Multiple JFrames, Good/Bad Practice?](http://stackoverflow.com/a/9554657/418556) — Andrew Thompson, Jul 01 '13 at 06:16

Hovercraft Full Of Eels · Accepted Answer · 2013-07-01T04:34:32.487

I wonder if you shouldn't be using JDialogs instead of JFrames, if the window is dependent on another window.

A solution is to use a class field to hold a reference to the window (JFrame or JDialog) and checking if it is null or visible, and if so, then lazily create/open the window,

public void newChat(User user) {
  if (chatWindow == null) {
    // create chatWindow in a lazy fashion
    chatWindow = new JDialog(myMainFrame, "Chat", /* modality type */);
    // ...  set up the chat window dialog
  }

  chatWindow.setVisible(true);
  addTabWithUser(user);
}

but that's about all I can say based on the information provided. If you need more specific help, then you will need to provide more information.

Thank you for giving me the idea of JDialog. – Sarang Jul 01 '13 at 05:04 — Sarang, Jul 01 '13 at 05:04

score 1 · Answer 2 · answered Sep 25 '15 at 13:24

1

If using JFrames it can be simply done like this:

if (Frame1.component != null) {
   Frame1 is opened
} else if (Frame2.component == null) {
   Frame2 is closed
}

Component ex.JTextField, JComboBox etc.

answered Sep 25 '15 at 13:24

Rytis Plečkauskas

33
9

1

getting "error: component has private access in Container" – Akhil Mar 13 '17 at 07:31

How to check if a jframe is opened?

2 Answers2

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