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我目前正在使用 Netbeans GUI 构建器制作一个 java swing GUI。我正在尝试将一堆面板动态添加到另一个面板，但它们没有显示出来。我已经尝试从可能有意义的每个点使用 repaint()、revalidate()、updateUI() 和 setvisible(true)。我还测试了面板是否添加到容器中。它们被添加，根本不显示。

这是添加面板的代码：

    public void setArrangement(LinkedList<PanelScheduleMusician> scheduledPlaces, LinkedList<PanelMusician> assignedMusicians, LinkedList<PanelMusician> freeMusicians) {

    _scheduledPlaces = scheduledPlaces;
    _assignedMusicians = assignedMusicians;
    _freeMusicians = freeMusicians;
}

public void displayPanels() {

    if(_assignedMusicians != null && _assignedMusicians.size() > 0) {
        Iterator<PanelScheduleMusician> iterator = _scheduledPlaces.iterator();
        for(PanelMusician p: _assignedMusicians) {
            iterator.next().setMusician(p);
        }
    }

    if(_scheduledPlaces != null && _scheduledPlaces.size() > 0) {
        GroupLayout layout = new GroupLayout(panelAssignedMusician);
        panelAssignedMusician.setLayout(layout);
        layout.setAutoCreateGaps(true);
        layout.setAutoCreateContainerGaps(true);
        GroupLayout.ParallelGroup parallelGroup = layout.createParallelGroup();
        GroupLayout.SequentialGroup sequentialGroup = layout.createSequentialGroup();

        for(PanelScheduleMusician p: _scheduledPlaces) {
            parallelGroup.addComponent(p);
            sequentialGroup.addComponent(p);
        }
        layout.setHorizontalGroup(parallelGroup);
        layout.setVerticalGroup(sequentialGroup);
    }

    if(_freeMusicians != null && _freeMusicians.size() > 0) {
        GroupLayout layout = new GroupLayout(panelFreeMusician);
        panelFreeMusician.setLayout(layout);
        layout.setAutoCreateGaps(true);
        layout.setAutoCreateContainerGaps(true);
        GroupLayout.ParallelGroup parallelGroup = layout.createParallelGroup();
        GroupLayout.SequentialGroup sequentialGroup = layout.createSequentialGroup();

        for(PanelMusician p: _freeMusicians) {
            parallelGroup.addComponent(p);
            sequentialGroup.addComponent(p);
        }
        layout.setHorizontalGroup(parallelGroup);
        layout.setVerticalGroup(sequentialGroup);
    }
}

public void reset() {
    removeAll();
    initialise();
}

private void initialise() {
    initComponents();
    displayPanels();
    revalidate();
    updateUI();

}

在这里我创建面板并调用方法：

    public FormEditDuty() {
    initComponents();

    LinkedList<PanelScheduleMusician> l1 = new LinkedList<>();
    LinkedList<PanelMusician> l2 = new LinkedList<>();
    LinkedList<PanelMusician> l3 = new LinkedList<>();

    l1.add(new PanelScheduleMusician());
    l1.add(new PanelScheduleMusician());
    l1.add(new PanelScheduleMusician());
    l1.add(new PanelScheduleMusician());

    l3.add(new PanelMusician());
    l3.add(new PanelMusician());
    l3.add(new PanelMusician());

    panelVioline1.setArrangement(l1, l2, l3);
    panelVioline1.reset();
}

我创建面板的方式只是一个测试，但在我继续之前它需要工作。如果我直接在同一个类中创建和添加面板，它工作正常。

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