Java 水平滚动条不适用于JScrollPane

这是我使用Miglayout的应用程序插件：

这是MigLayout初始代码，布局占据主面板100%的空间：

resPanel.setLayout(new BoxLayout(resPanel, BoxLayout.Y_AXIS));
mainPanel.setLayout(new MigLayout("", "[][grow][grow][]", "[][][][grow]"));
mainPanel.add(new JLabel("Class expression"), "wrap");
mainPanel.add(owlDescriptionEditor, "growx,span 3");
mainPanel.add(calcButton, "wrap");
mainPanel.add(new JLabel("Definitions found"), "span 2");
mainPanel.add(new JLabel("Target signature"), "span 2,wrap");
JScrollPane jsp = new JScrollPane(resPanel);
mainPanel.add(jsp, "growy, growx, span 2");
jsp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
mainPanel.add(new JScrollPane(deltaList), "growx,growy,span 2");

问题在于无法使用左侧列表的水平滚动条，即带有BoxLayout的JPanel，尽管我为此调用了setVerticalScrollBarPolicy。JPanel使用以下循环动态填充：

static void updateList(JPanel panel, Collection<OWLClassExpression> list) {
    panel.removeAll();
    for (int i = 0; i < 3; i++) {
        for (OWLClassExpression p : list) {
            String name = ((OWLNamedObject) p).getIRI().getShortForm();
            JEditorPane jep = new JEditorPane("text/html", name+"QWQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ");
            jep.setPreferredSize(new Dimension(200,20));
            jep.setEditable(false);
            jep.setOpaque(false);
            panel.add(jep);
        }
    }
    panel.add( Box.createVerticalStrut(400) );
}

静态无效更新列表（JPanel面板，集合列表）{
panel.removeAll（）；
对于（int i=0；i<3；i++）{
for（owlclasspression:list）{
字符串名称=（（OWLNamedObject）p.getIRI（）.getShortForm（）；
JEditorPane jep=新的JEditorPane（“text/html”，name+“qwqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq；
jep.setPreferredSize（新尺寸（200,20））；
jep.setEditable（false）；
jep.setOpaque（假）；
新增专家组（jep）；
}
}
面板。添加（框。垂直支柱（400））；
}

我必须添加最后一行，以使垂直滚动条工作。如果我不添加它，那么它也会丢失，即使它有底部额外空白的副作用。如何使滚动条正常工作

jep.setPreferredSize(new Dimension(200,20));

不要硬编码首选尺寸

每个组件将根据组件的属性（文本、字体等）动态地确定自己的首选大小

然后，布局管理器可以根据每个组件的首选大小动态地确定面板的大小，并在需要时显示滚动条

此外，在完成将所有组件添加到面板后，还需要使用：

panel.revalidate();

---

调用布局管理器，以便计算面板的新尺寸。

要更快获得更好的帮助，请发布或。如果MCVE/SSCCE只使用J2SE布局，这会有所帮助。