package trial;

import java.awt.Color;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;

public class Test {

public static void main(String arg[]){
    JFrame rootframe = new JFrame("Test panel");
    rootframe.setSize(800,550);
    rootframe.setExtendedState(JFrame.MAXIMIZED_BOTH);

    JPanel basePanel = new JPanel(); //fills rootFrame
    basePanel.setOpaque(true);
    basePanel.setBackground(Color.yellow );     

    JPanel panelContainingRadioButtons = new JPanel();//wraps radio buttons
    panelContainingRadioButtons.setOpaque(true);
    panelContainingRadioButtons.setBackground(new Color(0,100) );

    ButtonGroup buttonGroup1 = new ButtonGroup();

    JRadioButton jRadioButton1 = new JRadioButton();
    jRadioButton1.setText("Text A...............................");
    jRadioButton1.setOpaque(false);
    jRadioButton1.setForeground( Color.white);
    buttonGroup1.add(jRadioButton1);

    JRadioButton jRadioButton2 = new JRadioButton();
    jRadioButton2.setOpaque(false);
    jRadioButton2.setForeground( Color.white);
    buttonGroup1.add(jRadioButton2);
    jRadioButton2.setText("Text B.......................");

    JRadioButton jRadioButton3 = new JRadioButton();
    jRadioButton3.setOpaque(false);
    jRadioButton3.setForeground( Color.white);
    buttonGroup1.add(jRadioButton3);
    jRadioButton3.setText("Text C................................");

    panelContainingRadioButtons.add(jRadioButton1);
    panelContainingRadioButtons.add(jRadioButton2);
    panelContainingRadioButtons.add(jRadioButton3);

    basePanel.add(panelContainingRadioButtons);

    rootframe.add(basePanel);
    rootframe.setVisible(true);

}
}

我相信这不是单选按钮的问题,因为在另一个场合,我观察到在相同条件下,如果我将JLabel添加到顶部JPanel,并将侦听器添加到顶部面板,以便jLabel文本的颜色将当鼠标悬停时更改,并在鼠标退出时重置为原始颜色,文本将在不同位置重绘,如下图所示： –

如有必要,我也会发布该代码.我认为这两个案例都存在同样的问题.