如何更改JSplitPane的颜色

Question

我在阅读有关挥杆的书时编写了一个小程序，该程序在两个标签之间创建了一个JSplitPane。问题在于，几乎看不到JSplitPane（至少在我的操作系统-
MAC OS Lion中），并且在其上设置某些属性（如前景色）似乎不起作用。

这是代码：

//Demonstrate a simple JSplitPane


package swingexample4_6;

import javax.swing.*;
import java.awt.*;

public class SplitPaneDemo {

    //constructor
    public SplitPaneDemo()
    {
        //Create a new JFrame container.
        //Use the default border layout
        JFrame jfrm = new JFrame("Split Pane Demo");

        //Give the frame an initial size
        jfrm.setSize(380, 150);

        //Terminate the program when the user closes the application
        jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //--Make two labels to show the split pane
        JLabel jlab = new JLabel(" Left side: ABCDEFGHIJKLMNOPQRSTUVWXYZ");
        JLabel jlab2 = new JLabel(" Right side: ABCDEFGHIJKLMNOPQRSTUVWXYZ");

        //Set the minimum size for each label
        //This step is not technically needed to use a split pane,
        //but it enables the split pane resizing features to be
        //used to their maximum extent
        jlab.setMinimumSize(new Dimension(90, 30));
        jlab2.setMinimumSize(new Dimension(90, 30));

        //--Create a split pane
        JSplitPane jsp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, true, jlab, jlab2);

        //Code to get a list of component names in the console
        Component[] listComponents = jsp.getComponents();

        String theList;
        for (Component myComponent: listComponents)
        {
            theList = myComponent.toString();
            System.out.println(theList);
        }


        //Add the split pane to the content pane
        jfrm.getContentPane().add(jsp);

        //Display the frame
        jfrm.setVisible(true);
    }

    public static void main(String[] args) {
        //Create the frame on the event dispatching thread
        SwingUtilities.invokeLater(new Runnable(){

            @Override
            public void run() {
                new SplitPaneDemo();
            }

        });
    }
}

有什么方法可以改变它的颜色，使其真正脱颖而出吗？谢谢。

Answer 1

JLabel是默认设置NON_Opaque，简单是透明的，您可以

• 更改JLabels为JComponent或JPanel可能更好

• 通过改变不透明度 JLabel#setOpaque(true)