Java Jcomponents以本机外观显示问题

我有一个简单的GUI，其中包含JButton、JMenuBar。这在正常情况下工作良好（显示和对齐），但如果我使用下面的UIManager代码，则不正确

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

我面临的问题的SSSCE发布在下面

import java.awt.HeadlessException;
import javax.swing.GroupLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class UiManagerEx extends JFrame{
    JMenuBar menuBar;
    JTextField textField;
    JLabel labl;
    JButton btn;

    public static void main(String[] args) {
        new UiManagerEx();
    }

    public UiManagerEx() throws HeadlessException {
        init();
    }
    private void init(){
        JPanel panel = new JPanel();

        menuBar = new JMenuBar();
        JMenu fileMenu = new JMenu("Example");
        menuBar.add(fileMenu);

        JMenuItem menuAction = new JMenuItem("ONE");
        fileMenu.add(menuAction);

        JMenuItem menu1Action = new JMenuItem("TWO");
        fileMenu.add(menu1Action);

        labl = new JLabel("Test");
        textField = new JTextField("example Program");
        btn = new JButton("enable");
        btn.setEnabled(false); // Make it true and the text will be visible.

        GroupLayout settingsLayout = new GroupLayout(panel);
        panel.setLayout(settingsLayout);
        settingsLayout.setAutoCreateGaps(true);
        settingsLayout.setAutoCreateContainerGaps(true);
        GroupLayout.SequentialGroup hGroup = settingsLayout.createSequentialGroup();
        hGroup.addGroup(settingsLayout.createParallelGroup()
                .addComponent(labl));
        hGroup.addGap(10);
        hGroup.addGroup(settingsLayout.createParallelGroup()
                .addComponent(textField,GroupLayout.PREFERRED_SIZE, 200, GroupLayout.PREFERRED_SIZE));
        hGroup.addGap(10);
        hGroup.addGroup(settingsLayout.createParallelGroup()
                .addComponent(btn,GroupLayout.PREFERRED_SIZE, 100, GroupLayout.PREFERRED_SIZE));
        hGroup.addGap(10);
        settingsLayout.setHorizontalGroup(hGroup);
        GroupLayout.SequentialGroup vGroup = settingsLayout.createSequentialGroup();
        vGroup.addGap(10);
        vGroup.addGroup(settingsLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                .addComponent(labl)
                .addComponent(textField)
                .addComponent(btn));
        vGroup.addGap(10);

        settingsLayout.setVerticalGroup(vGroup);
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); //Comment this to make "alignement of JmenuItem" work properly
        } catch (ClassNotFoundException ex) {}
        catch (InstantiationException ex) {}
        catch (IllegalAccessException ex) {}
        catch (UnsupportedLookAndFeelException ex) {}

        add(panel);
        setJMenuBar(menuBar);
        setTitle("Stack overflow");
        setResizable(true);
        setSize(400, 200);
        setLocationRelativeTo(this);
        setVisible(true);
    }
}

以本地的外观和感觉

如果我使用

Jbutton.SetEnabled（false）

JmenuBar显示不正确。（单击菜单栏时，菜单项未正确对齐）

在处理这些问题的java应用程序中，是否有什么方法可以获得本机的外观

---

我对这件事还不熟悉。。请帮忙

在创建对象之前设置LookAndFeel。然后显示按钮文本： 但我无法解释原因。也许会有一些初始状态取决于外观和感觉

private void init(){
 try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); // Comment this to make
                                                                           // "alignement of JmenuItem" work
                                                                           // properly
    }
    catch (ClassNotFoundException ex) {
      ex.printStackTrace();
    }
    catch (InstantiationException ex) {
      ex.printStackTrace();
    }
    catch (IllegalAccessException ex) {
      ex.printStackTrace();
    }
    catch (UnsupportedLookAndFeelException ex) {
      ex.printStackTrace();
    }
    JPanel panel = new JPanel();