import java.awt.FlowLayout;import java.awt.GridLayout;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import javax.swing.BoxLayout;import javax.swing.JTabbedPane;import javax.swing.JPanel;import javax.swing.JFrame;import javax.swing.JButton;import javax.swing.ImageIcon;import javax.swing.UIManager; class TabPane extends JTabbedPane{ JPanel panel1, panel2, panel3, panel4, panel5;  public TabPane () {  //super (a, b);  panel1 = new JPanel ();  panel1.add(new JButton());  panel2 = new JPanel (new BorderLayout());  panel3 = new JPanel (true);  panel4 = new JPanel (new GridLayout(2,3));  panel5 = new JPanel (new FlowLayout(FlowLayout.LEFT, 1, 0));  //以上是JPanel的四种构造方法  //窗体布局器有四种设置：  //new BorderLayout () or new BorderLayout (int hgap, int vgap)  //new GridLayout () or new GridLayout (int rows, int cols) new GridLayout (int rows, int cols, int hgap, int vgap)  //new FlowLayout () or new FlowLayout (int align) or new FlowLayout (int align, int hgap, int vgap)  //new BoxLayout (Container target, int axis)    //public JTabbedPane (int tabPlacement, int tabLayoutPolicy)  //tabPlacement:JTabbedPane.TOP, JTabbedPane.BOTTOM, JTabbedPane.LEFT, or JTabbedPane.RIGHT.  //ltabLayoutPolicy:JTabbedPane.WRAP_TAB_LAYOUT or JTabbedPane.SCROLL_TAB_LAYOUT.  //其他两种JTabbedPane的构造方法:  //JTabbedPane ()  //JTabbedPane (int tabPlacement)  add (panel1, 0);  setBackgroundAt (0, Color.cyan);  setForegroundAt (0,Color.red);   add (panel2, this , 1);  setEnabledAt (1, false);  setTitleAt (1,"panel one");   addTab ("panel3", panel3);  setToolTipTextAt (2, "ToolTip3");   addTab ("panel4", new ImageIcon("QQ.png"), panel4, "ToolTip4");    addTab ("panel5", panel5);    setPreferredSize (new Dimension (500,200));  setTabPlacement (JTabbedPane.BOTTOM);//设置标签的位置  setTabLayoutPolicy (JTabbedPane.SCROLL_TAB_LAYOUT); }} public class JTabbedPaneDemo{ public static void main(String[] args) {  try{UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}catch(Exception e){}//显示风格  TabPane tabPane = new TabPane ();  JFrame frame = new JFrame ("JTabbedPaneDemo");  frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);  frame.setVisible (true);//默认为false  frame.setContentPane(tabPane);  frame.pack(); }}        

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