JTabbedPane中的图标未显示 [英] icon in JTabbedPane is not shown

问题描述

我的标签出现问题：

JTabbedPane tab = new JTabbedPane();
    frame.add(tab, BorderLayout.CENTER);

    JPanel contact = new JPanel();
    contact.add(backgroundContact);
    tab.add("Contacto", contact);
    //tab.addTab("Contacto",new ImageIcon("images/image2.gif"), contact,"");

    JPanel schedule = new JPanel();
    schedule.add(backgroundSchedule);
    tab.add("Horario", schedule);
    //tab.addTab("Horario", new ImageIcon("images/image2.gif"), schedule,"");

    JPanel cost = new JPanel();
    cost.add(backgroundCost);
    tab.add("Tarifas", cost);
    //tab.addTab("Tarifas", new ImageIcon("images/image3.gif"), cost,"");


      // Los iconos
    tab.setIconAt(0, new ImageIcon("images/image1.gif"));
    tab.setIconAt(1, new ImageIcon("images/image2.gif"));
    tab.setIconAt(2, new ImageIcon("images/image3.gif"));

我已尝试过两种选项，但图标未显示。为什么会这样？

I've tried both options, but the icons are not shown. Why is it happening?

我也试过：新的ImageIcon（images / im.gif）哪个不存在而我没有任何错误

I also tried: new ImageIcon("images/im.gif") which doesn't exist and I haven any error

推荐答案

试试这个：

URL urlToImage3 = this.getClass().getResource("/" + "images/image3.gif");
... new ImageIcon(urlToImage3);

您可以连接/+images / image3.gif - 我只想突出显示领先的 / ，因为从类路径的根搜索更加健壮。

You might concatenate "/" + "images/image3.gif" - I just wanted to highlight the leading /, since it is more robust to search from the root of the class-path.

如果我怀疑这些图像是嵌入式资源，那么在运行时它们将无法通过文件获得，但是在应用程序的一个Jars中的类路径上，因此可以通过 URL 获得。

If these images are an 'embedded resource' as I suspect, they will not be available by File at run-time, but should be on the class-path in one of the Jars of the app., and therefore available by URL.

这篇关于JTabbedPane中的图标未显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！