怎样用Java做出选项卡解决方法

import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import java.awt.Image;import java.awt.Toolkit;import java.io.File;import javax.swing.AbstractButton;import javax.swing.BorderFactory;import javax.swing.BoxLayout;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JComponent;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTabbedPane;import javax.swing.border.LineBorder;import javax.swing.border.TitledBorder;public class BoxAlignmentDemo extends JPanel {    public BoxAlignmentDemo() {        super(new BorderLayout());        JTabbedPane tabbedPane = new JTabbedPane();//■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■做出选项卡■■■■■■■■■■■■■■■■■■■■■■■■■■■        JPanel buttonRow = new JPanel();        // Use default FlowLayout.        buttonRow.add(createButtonRow(false));        buttonRow.add(createButtonRow(true));        tabbedPane.addTab("Altering alignments", buttonRow);//■■■■■■■■■■■■■■■■■■■■■■■选项卡上添加组件■■■■■■■■■■■■■■■■■■■■■■        JPanel labelAndComponent = new JPanel();        // Use default FlowLayout.        labelAndComponent.add(createLabelAndComponent(false));        labelAndComponent.add(createLabelAndComponent(true));        tabbedPane.addTab("X alignment mismatch", labelAndComponent);//■■■■■■■■■■■■■■■■■■选项卡上添加组件■■■■■■■■■■■■■■■■■■        JPanel buttonAndComponent = new JPanel();        // Use default FlowLayout.        buttonAndComponent.add(createYAlignmentExample(false));        buttonAndComponent.add(createYAlignmentExample(true));        tabbedPane.addTab("Y alignment mismatch", buttonAndComponent);//■■■■■■■■■■■■■■■■■■选项卡上添加组件■■■■■■■■■■■■■■■■■        // Add tabbedPane to this panel.        add(tabbedPane, BorderLayout.CENTER);    }    protected JPanel createButtonRow(boolean changeAlignment) {        String prefix = System.getProperty("user.dir") + File.separator;        String pathPrefix = System.getProperty("user.dir");        String path1 = pathPrefix + "\\images\\geek-cght.gif";        String path2 = pathPrefix + "\\images\\middle.gif";        // System.out.println(File.separator);        // System.out.println("尼玛手工输入的"+"\\");        Image img_1 = Toolkit.getDefaultToolkit().getImage(path1);        ImageIcon img1 = new ImageIcon(img_1);        Image img_2 = Toolkit.getDefaultToolkit().getImage(path2);        ImageIcon img2 = new ImageIcon(img_2);        JButton button1 = new JButton("A JButton", img2);        button1.setVerticalTextPosition(AbstractButton.BOTTOM);        button1.setHorizontalTextPosition(AbstractButton.CENTER);        // JButton button2 = new JButton("Another JButton",        // createImageIcon("E:\\Users\\hp\\ee_TDDOWNLOAD\\workspace1\\CS_SE\\images\\geek-cght.gif"));        JButton button2 = new JButton("Another JButton", img1);        button2.setVerticalTextPosition(AbstractButton.BOTTOM);        button2.setHorizontalTextPosition(AbstractButton.CENTER);        String title;        if (changeAlignment) {            title = "Desired";            button1.setAlignmentY(BOTTOM_ALIGNMENT);// JComponent setAlignmentY            button2.setAlignmentY(BOTTOM_ALIGNMENT);        } else {            title = "Default";        }        JPanel pane = new JPanel();        pane.setBorder(BorderFactory.createTitledBorder(title));        pane.setLayout(new BoxLayout(pane, BoxLayout.X_AXIS));        pane.add(button1);        pane.add(button2);        return pane;    }    protected JPanel createLabelAndComponent(boolean doItRight) {        JPanel pane = new JPanel();        JComponent component = new JPanel();        Dimension size = new Dimension(150, 100);        component.setMaximumSize(size);        component.setPreferredSize(size);        component.setMinimumSize(size);        TitledBorder border = new TitledBorder(new LineBorder(Color.black),                "A JPanel", TitledBorder.CENTER, TitledBorder.BELOW_TOP);        border.setTitleColor(Color.black);        component.setBorder(border);        JLabel label = new JLabel("This is a JLabel");        String title;        if (doItRight) {            title = "Matched";            label.setAlignmentX(CENTER_ALIGNMENT);        } else {            title = "Mismatched";        }        pane.setBorder(BorderFactory.createTitledBorder(title));        pane.setLayout(new BoxLayout(pane, BoxLayout.Y_AXIS));        pane.add(label);        pane.add(component);        return pane;    }    protected JPanel createYAlignmentExample(boolean doItRight) {        JPanel pane = new JPanel();        String title;        JComponent component1 = new JPanel();        Dimension size = new Dimension(100, 50);        component1.setMaximumSize(size);        component1.setPreferredSize(size);        component1.setMinimumSize(size);        TitledBorder border = new TitledBorder(new LineBorder(Color.black),                "A JPanel", TitledBorder.CENTER, TitledBorder.BELOW_TOP);        border.setTitleColor(Color.black);        component1.setBorder(border);        JComponent component2 = new JPanel();        size = new Dimension(100, 50);        component2.setMaximumSize(size);        component2.setPreferredSize(size);        component2.setMinimumSize(size);        border = new TitledBorder(new LineBorder(Color.black), "A JPanel",                TitledBorder.CENTER, TitledBorder.BELOW_TOP);        border.setTitleColor(Color.black);        component2.setBorder(border);        if (doItRight) {            title = "Matched";        } else {            component1.setAlignmentY(TOP_ALIGNMENT);//顶部对其            title = "Mismatched";        }        pane.setBorder(BorderFactory.createTitledBorder(title));        pane.setLayout(new BoxLayout(pane, BoxLayout.X_AXIS));        pane.add(component1);        pane.add(component2);        return pane;    }    /** Returns an ImageIcon, or null if the path was invalid. */    protected static ImageIcon createImageIcon(String path) {        java.net.URL imgURL = BoxAlignmentDemo.class.getResource(path);        if (imgURL != null) {            return new ImageIcon(imgURL);        } else {            System.err.println("Couldn't find file: " + path);            return null;        }    }    /**     * Create the GUI and show it. For thread safety, this method should be     * invoked from the event-dispatching thread.     */    private static void createAndShowGUI() {        // Create and set up the window.        JFrame frame = new JFrame("BoxAlignmentDemo");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        // Create and set up the content pane.        BoxAlignmentDemo newContentPane = new BoxAlignmentDemo();        newContentPane.setOpaque(true); // content panes must be opaque        frame.setContentPane(newContentPane);        // Display the window.        frame.pack();        frame.setVisible(true);    }    public static void main(String[] args) {        // Schedule a job for the event-dispatching thread:        // creating and showing this application's GUI.        javax.swing.SwingUtilities.invokeLater(new Runnable() {            public void run() {                createAndShowGUI();            }        });    }}