tabbedpaneexam.java

Java程序设计实用教程源代码 本书源代码按章分别放置在不同的文件夹中,所有程序均在JDK1.6环境下编译运行正常,除了第13章需要建立ODBC数据源之外,其他程序只要有Java运行环境即可直接运行

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class tabbedPaneExam extends JFrame implements ActionListener {
  private JTabbedPane jtab;
  private JButton topjbutton = new JButton("顶部");
  private JButton bottomjbutton = new JButton("底部");
  private JButton leftjbutton = new JButton("左边");
  private JButton rightjbutton = new JButton("右边");
  private JButton addjbutton = new JButton("添加选项卡");
  private JButton removejbutton = new JButton("删除选项卡");
  public tabbedPaneExam() { //构造方法
    super("TabbedPane演示");
    JPanel buttonPanel = new JPanel();
    buttonPanel.setLayout(new GridLayout(1, 6));
    topjbutton.addActionListener(this);
    bottomjbutton.addActionListener(this);
    leftjbutton.addActionListener(this);
    rightjbutton.addActionListener(this);
    addjbutton.addActionListener(this);
    removejbutton.addActionListener(this);
    buttonPanel.add(topjbutton);
    buttonPanel.add(bottomjbutton);
    buttonPanel.add(leftjbutton);
    buttonPanel.add(rightjbutton);
    buttonPanel.add(addjbutton);
    buttonPanel.add(removejbutton);
    //把选项卡布局管理器和面板加入到内容窗格中
    jtab = new JTabbedPane(SwingConstants.TOP);
    getContentPane().add("South", buttonPanel);
    getContentPane().add("Center", jtab);
    //创建3个选项卡
    createTab();
    createTab();
    createTab();
    //显示第一个选项卡
    jtab.setSelectedIndex(0);
  }
  public void createTab() {
    JLabel jl = null;
    switch (jtab.getTabCount() % 3) {
      case 0:
        jl = new JLabel("选项卡" + jtab.getTabCount(),SwingConstants.CENTER);
        break;
      case 1:
        jl = new JLabel("选项卡" + jtab.getTabCount(),SwingConstants.CENTER);
        break;
      case 2:
        jl = new JLabel("选项卡" + jtab.getTabCount(),SwingConstants.CENTER);
        break;
    }
    jl.setVerticalTextPosition(SwingConstants.BOTTOM);
    jl.setHorizontalTextPosition(SwingConstants.CENTER);
    jl.setOpaque(true);
    jl.setBackground(Color.white);
    jtab.addTab("选项卡" + jtab.getTabCount(), jl);
  }
  public void deleteTab() {
    if (jtab.getTabCount() > 0)
      jtab.removeTabAt(jtab.getTabCount() - 1);
  }
  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == topjbutton)
      jtab.setTabPlacement(SwingConstants.TOP);
    else if (e.getSource() == bottomjbutton)
      jtab.setTabPlacement(SwingConstants.BOTTOM);
    else if (e.getSource() == leftjbutton)
      jtab.setTabPlacement(SwingConstants.LEFT);
    else if (e.getSource() == rightjbutton)
      jtab.setTabPlacement(SwingConstants.RIGHT);
    else if (e.getSource() == addjbutton)
      createTab();
    else if (e.getSource() == removejbutton)
      deleteTab();
    jtab.revalidate();
    jtab.repaint();
  }
  public static void main(String[] args) {
    tabbedPaneExam jframe = new tabbedPaneExam();
    jframe.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    jframe.pack();
    jframe.setVisible(true);
  }
}