打开另一个JFrame时JFrame卡住了

Question

EDIT2 : Tested it. It is definetily a problem with the new JPanel.

SOLUTION : As proposed the answer is that i forgot to explicitely set my JPanel onto my JFrame. Change:

setContentPane(contentPanetagesliste);

to

frame.setContentPane(contentPanetagesliste);

and it works for me!

---

My Problem is a strange behavior of JFrame.

In my code I got a radioButton on my MainFrame. When it is pressed it opens up the other Frame.

RadioBTNtagesliste.addActionListener (new ActionListener () {
    public void actionPerformed(ActionEvent e) {
                    frame.setSize(590, 450); ...

In my new Frame I made a JPanel. Before adding the JPanel the other Frame didn't freeze, so I believe the problem got something to do with the new JPanel.

JPanel contentPanetagesliste;

contentPanetagesliste = new JPanel();

contentPanetagesliste.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPanetagesliste);

In the end I add a JScrollPane to the JPanel (that's the reason why I had to make one) and make the JFrame visible.

JScrollPane jsp = new JScrollPane(contentPanetagesliste);
frame.add(jsp);


frame.setVisible(true);

I absolutely have no clue how the new JPanel could interfere with the Main JFrame or the JPanel lying above the MainJFrame. I hope some of you can help me.

EDIT: because it wasn't clear to some: by stuck i mean unresponsive and when i move it, it goes blank grey.

To the image: When I press the radio button to the far top right, the new window opens, is fully functional but the old window is stuck.

image

---

For additional information I'll post the complete code from my action listener with explanation.

RadioBTNtagesliste.addActionListener (new ActionListener () {
    public void actionPerformed(ActionEvent e) {
        try {
            if(RadioBTNtagesliste.isSelected() == true){
                String Eintrag = HttpClass.httpRequestEintrag(usernamevar,EintragStringPK,"eintragTABLE");
                 JSONObject jsonObjectEintrag = new JSONObject(Eintrag); 
                int ProjektJSONlength = jsonObjectEintrag.length() - 1;

                frame.setSize(590, 450);
                JPanel contentPanetagesliste;

                contentPanetagesliste = new JPanel();

                contentPanetagesliste.setBorder(new EmptyBorder(5, 5, 5, 5));
                setContentPane(contentPanetagesliste);

                double[] temp = new double[ProjektJSONlength+2];
                temp[0] = 10;
                temp[1] = 30;
                for(int i = 0; i < ProjektJSONlength; i++){
                    temp[i+2] = 25;
                }

                double size[][] = {{2, 90, 90, 90, 90, 90,90, 2}, // Columns
                    temp}; // Rows                      
                contentPanetagesliste.setLayout(new TableLayout(size));                     
                String label[] = {"Eintrag Nr.", "Projekt", "Aktivität", "Dauer", "Beschreibung", "Symbol"};

                JButton button[] = new JButton[label.length];
                JTextField textfield[] = new JTextField[label.length];

                for (int i = 0; i < label.length; i++) {
                    button[i] = new JButton(label[i]);
                }   

                contentPanetagesliste.add(button[0], "1, 1");
                contentPanetagesliste.add(button[1], "2, 1");
                contentPanetagesliste.add(button[2], "3, 1");
                contentPanetagesliste.add(button[3], "4, 1");
                contentPanetagesliste.add(button[4], "5, 1");
                contentPanetagesliste.add(button[5], "6, 1");

                EintragStringPK = "Neu";                        

                for (int key=0; key<=ProjektJSONlength;key++) {
                    JSONObject jsonObjectProjekteObjekt0 = jsonObjectEintrag.getJSONObject(String.valueOf(key));  
                    String Eintraege = jsonObjectProjekteObjekt0.toString();
                    String EintragStringDauer = jsonObjectProjekteObjekt0.getString("dauer");  // String auslesen!!!                            
                    String EintragStringBEschreibung = jsonObjectProjekteObjekt0.getString("beschreibung");  // String auslesen!!!      
                    String EintragStringProjektname = jsonObjectProjekteObjekt0.getString("projektname");  // String auslesen!!!                            
                    String EintragStringAktivitaet = jsonObjectProjekteObjekt0.getString("kategorie");  // String auslesen!!!                           
                    EintragStringPK = jsonObjectProjekteObjekt0.getString("pk_ei_id");  // String auslesen!!!               

                    System.out.println("test" + key);
                    System.out.println(ProjektJSONlength);  
                    String labelCONTENT[] = {EintragStringPK, EintragStringProjektname, EintragStringAktivitaet, EintragStringDauer, EintragStringBEschreibung, "Symbol"};

                    for (int i = 0; i < labelCONTENT.length; i++) {
                        textfield[i] = new JTextField(labelCONTENT[i]);
                    }
                    int keypone = key+2;
                    String keyString = Integer.toString(keypone);
                    contentPanetagesliste.add(textfield[0], "1, "+keyString);
                    contentPanetagesliste.add(textfield[1], "2, "+keyString);
                    contentPanetagesliste.add(textfield[2], "3, "+keyString);
                    contentPanetagesliste.add(textfield[3], "4, "+keyString);
                    contentPanetagesliste.add(textfield[4], "5, "+keyString);
                    contentPanetagesliste.add(textfield[5], "6, "+keyString);
                }

                JScrollPane jsp = new JScrollPane(contentPanetagesliste);
                frame.add(jsp);
                frame.setVisible(true);
                System.out.println("ende");
            }else{
                frame.setVisible(false);
                System.out.println("ende2");    
            }
            System.out.println("ende3");

        } catch (JSONException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        System.out.println("ende4");

    }
});

Explanation:

I create the JFrame, afterwards the JPanel.

Create an Array and the rest necessary for my Table, because the goal is to make a generated table with data from a SQL DB.

There is also a HTTPrequest and a loop to get out the data and put it into the table fields. Still in the loop the filled table fields are added to the content pane and at the very and the Jpanel get's his JScrollPane and the frame is set visible.

I really hope someone can help me, and if you got tips for making better questions I've got an open ear.

Answer 1

setContentPane(contentPanetagesliste); should be explicit set to the new frame you created like this: frame.setContentPane(contentPanetagesliste); .