真的又快又脏（肯定需要改进和改变），但我想这样的东西可能对你有用（但不是 JTabbePane）：
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
public class Test {
/**
* FlowLayout subclass that fully supports wrapping of components.
*/
public static class WrapLayout extends FlowLayout {
private Dimension preferredLayoutSize;
/**
* Constructs a new <code>WrapLayout</code> with a left alignment and a
* default 5-unit horizontal and vertical gap.
*/
public WrapLayout() {
super();
}
/**
* Constructs a new <code>FlowLayout</code> with the specified alignment
* and a default 5-unit horizontal and vertical gap. The value of the
* alignment argument must be one of <code>WrapLayout</code>,
* <code>WrapLayout</code>, or <code>WrapLayout</code>.
*
* @param align
* the alignment value
*/
public WrapLayout(int align) {
super(align);
}
/**
* Creates a new flow layout manager with the indicated alignment and
* the indicated horizontal and vertical gaps.
* <p>
* The value of the alignment argument must be one of
* <code>WrapLayout</code>, <code>WrapLayout</code>, or
* <code>WrapLayout</code>.
*
* @param align
* the alignment value
* @param hgap
* the horizontal gap between components
* @param vgap
* the vertical gap between components
*/
public WrapLayout(int align, int hgap, int vgap) {
super(align, hgap, vgap);
}
/**
* Returns the preferred dimensions for this layout given the
* <i>visible</i> components in the specified target container.
*
* @param target
* the component which needs to be laid out
* @return the preferred dimensions to lay out the subcomponents of the
* specified container
*/
@Override
public Dimension preferredLayoutSize(Container target) {
return layoutSize(target, true);
}
/**
* Returns the minimum dimensions needed to layout the <i>visible</i>
* components contained in the specified target container.
*
* @param target
* the component which needs to be laid out
* @return the minimum dimensions to lay out the subcomponents of the
* specified container
*/
@Override
public Dimension minimumLayoutSize(Container target) {
Dimension minimum = layoutSize(target, false);
minimum.width -= getHgap() + 1;
return minimum;
}
/**
* Returns the minimum or preferred dimension needed to layout the
* target container.
*
* @param target
* target to get layout size for
* @param preferred
* should preferred size be calculated
* @return the dimension to layout the target container
*/
private Dimension layoutSize(Container target, boolean preferred) {
synchronized (target.getTreeLock()) {
// Each row must fit with the width allocated to the containter.
// When the container width = 0, the preferred width of the
// container
// has not yet been calculated so lets ask for the maximum.
int targetWidth = target.getSize().width;
if (targetWidth == 0) {
targetWidth = Integer.MAX_VALUE;
}
int hgap = getHgap();
int vgap = getVgap();
Insets insets = target.getInsets();
int horizontalInsetsAndGap = insets.left + insets.right + hgap * 2;
int maxWidth = targetWidth - horizontalInsetsAndGap;
// Fit components into the allowed width
Dimension dim = new Dimension(0, 0);
int rowWidth = 0;
int rowHeight = 0;
int nmembers = target.getComponentCount();
for (int i = 0; i < nmembers; i++) {
Component m = target.getComponent(i);
if (m.isVisible()) {
Dimension d = preferred ? m.getPreferredSize() : m.getMinimumSize();
// Can't add the component to current row. Start a new
// row.
if (rowWidth + d.width > maxWidth) {
addRow(dim, rowWidth, rowHeight);
rowWidth = 0;
rowHeight = 0;
}
// Add a horizontal gap for all components after the
// first
if (rowWidth != 0) {
rowWidth += hgap;
}
rowWidth += d.width;
rowHeight = Math.max(rowHeight, d.height);
}
}
addRow(dim, rowWidth, rowHeight);
dim.width += horizontalInsetsAndGap;
dim.height += insets.top + insets.bottom + vgap * 2;
// When using a scroll pane or the DecoratedLookAndFeel we need
// to
// make sure the preferred size is less than the size of the
// target containter so shrinking the container size works
// correctly. Removing the horizontal gap is an easy way to do
// this.
Container scrollPane = SwingUtilities.getAncestorOfClass(JScrollPane.class, target);
if (scrollPane != null) {
dim.width -= hgap + 1;
}
return dim;
}
}
/*
* A new row has been completed. Use the dimensions of this row
* to update the preferred size for the container.
*
* @param dim update the width and height when appropriate
* @param rowWidth the width of the row to add
* @param rowHeight the height of the row to add
*/
private void addRow(Dimension dim, int rowWidth, int rowHeight) {
dim.width = Math.max(dim.width, rowWidth);
if (dim.height > 0) {
dim.height += getVgap();
}
dim.height += rowHeight;
}
}
public static class MyTabbedPane extends JPanel {
private JPanel buttonPanel;
private JPanel currentview;
private Tab currentTab;
private class Tab {
String name;
JComponent component;
}
private List<Tab> tabs = new ArrayList<Tab>();
public MyTabbedPane() {
super(new BorderLayout());
buttonPanel = new JPanel(new WrapLayout());
currentview = new JPanel();
add(buttonPanel, BorderLayout.NORTH);
add(currentview);
}
public void addTab(String name, JComponent tabView, int index) {
if (index < 0 || index > tabs.size()) {
throw new IllegalArgumentException("Index out of bounds");
}
final Tab tab = new Tab();
tab.component = tabView;
tab.name = name;
tabs.add(index, tab);
JButton b = new JButton(name);
b.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
setCurrentTab(tab);
}
});
buttonPanel.add(b, index);
buttonPanel.validate();
}
public void removeTab(int i) {
Tab tab = tabs.remove(i);
if (tab == currentTab) {
if (tabs.size() > 0) {
if (i < tabs.size()) {
setCurrentTab(tabs.get(i));
} else {
setCurrentTab(tabs.get(i - 1));
}
} else {
setCurrentTab(null);
}
}
buttonPanel.remove(index);
}
void setCurrentTab(final Tab tab) {
if (currentTab == tab) {
return;
}
if (currentTab != null) {
currentview.remove(currentTab.component);
}
if (tab != null) {
currentview.add(tab.component);
}
currentTab = tab;
currentview.validate();
}
}
public static void main(String[] args) {
JFrame frame = new JFrame();
MyTabbedPane tabbedPane = new MyTabbedPane();
for (int i = 0; i < 100; i++) {
tabbedPane.addTab("Button " + (i + 1), new JLabel("Dummy Label " + (i + 1)), i);
}
frame.add(tabbedPane);
frame.pack();
frame.setSize(new Dimension(1000, 800));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
WrapLayout 取自 SO 上的另一篇文章。