swing组件部分讲义

1、一 文本框1 JTextField 例1 public class JTextDemo01public static void main(String args)JFrame frame = new JFrame("Welcome To MLDN") ;JTextField name = new JTextField(30) ;JTextField noed = new JTextField("MLDN",10) ;JLabel nameLab = new JLabel("输入用户姓名：") ;JLabel noedLab = new

2、 JLabel("不可编辑文本：") ;name.setColumns(30) ;noed.setColumns(10) ;noed.setEnabled(false) ;/ 表示不可编辑nameLab.setBounds(10,10,100,20) ;noedLab.setBounds(10,40,100,20) ;name.setBounds(110,10,80,20) ;noed.setBounds(110,40,50,20) ;frame.setLayout(null) ;frame.add(nameLab) ;frame.add(name) ;frame.add(

3、noedLab) ;frame.add(noed) ;frame.setSize(300,100) ;frame.setLocation(300,200) ;frame.setVisible(true) ;2 JPasswordField例2 JPasswordField jpf2 = new JPasswordField() ;jpf2.setEchoChar('#') ;/ 设置回显3 JTextArea 例3 public class JTextAreaDemo02public static void main(String args)JFrame frame = new

4、 JFrame("Welcome To MLDN") ;JTextArea jta = new JTextArea(3,10) ;/ 设置大小JLabel lab = new JLabel("多行文本域：") ;JScrollPane scr = new JScrollPane(jta,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS ,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS ) ;frame.setLayout(new GridLayout(2,1) ;/ 取消布局管理器frame.ad

5、d(lab) ;frame.add(scr) ;frame.setSize(300,150) ;frame.setLocation(300,200) ;frame.setVisible(true) ;二 单选框 例5 class MyRadio1 implements ItemListenerprivate JFrame frame = new JFrame("Welcome TO MLDN") ;private Container cont = frame.getContentPane() ;private JRadioButton jrb1 = new JRadioBu

6、tton("MLDN") ;private JRadioButton jrb2 = new JRadioButton("MLDNJAVA") ;private JRadioButton jrb3 = new JRadioButton("智囊团") ;private JPanel pan = new JPanel() ;private JLabel la1=new JLabel("请选择选项");public MyRadio1()pan.setBorder(BorderFactory.createTitledBord

7、er("请选择最喜爱的网站") ;/ 设置一个边框的显示条pan.setLayout(new GridLayout(1,3) ;pan.add(this.jrb1) ;pan.add(this.jrb2) ;pan.add(this.jrb3) ;ButtonGroup group = new ButtonGroup() ;group.add(this.jrb1) ;group.add(this.jrb2) ;group.add(this.jrb3) ;cont.add(pan,"North");cont.add(la1);jrb1.addItemLis

8、tener(this) ;jrb2.addItemListener(this) ;jrb3.addItemListener(this) ;this.frame.setSize(400,300) ;this.frame.setVisible(true) ;this.frame.addWindowListener(new WindowAdapter()public void windowClosing(WindowEvent obj)System.exit(1) ;) ;public void itemStateChanged(ItemEvent e)if(e.getSource()=jrb1)l

9、a1.setText("你选择了第一项");elsela1.setText("你选择了其他");public class JRadioButtonDemo02public static void main(String args)new MyRadio1() ;三 组合框class MyItemListener implements ItemListenerprivate String right = "d:" + + "right.png" ;private String wrong = "d:&quo

10、t; + + "wrong.gif" ;public void itemStateChanged(ItemEvent e)/ 不管如何操作，则肯定由JCheckBox产生事件JCheckBox jcb = (JCheckBox)e.getItem() ;/ 得到产生的事件if(jcb.isSelected()/ 如果被选中了，则显示正确的图片jcb.setIcon(new ImageIcon(right) ;elsejcb.setIcon(new ImageIcon(wrong) ;class MyCheckBoxprivate String wrong = "d

11、:" + + "wrong.gif" ;private JFrame frame = new JFrame("Welcome To MLDN") ;/ 定义窗体private Container cont = frame.getContentPane() ;/ 得到窗体容器private JCheckBox jcb1 = new JCheckBox("MLDN",new ImageIcon(wrong) ;/ 定义一个复选框private JCheckBox jcb2 = new JCheckBox("MLDNJA

12、VA",new ImageIcon(wrong) ;/ 定义一个复选框private JCheckBox jcb3 = new JCheckBox("智囊团",new ImageIcon(wrong) ;/ 定义一个复选框private JPanel pan = new JPanel() ;public MyCheckBox()pan.setBorder(BorderFactory.createTitledBorder("请选择最喜爱的网站") ;pan.setLayout(new GridLayout(1,3) ;/ 设置组件的排版 pan.

13、add(this.jcb1) ;/ 增加组件pan.add(this.jcb2) ;/ 增加组件pan.add(this.jcb3) ;/ 增加组件jcb1.addItemListener(new MyItemListener() ;jcb2.addItemListener(new MyItemListener() ;jcb3.addItemListener(new MyItemListener() ;cont.add(pan) ;/ 将面板加入到容器之中this.frame.setSize(330,80) ;this.frame.setVisible(true) ;/ 设置可显示this.f

14、rame.addWindowListener(new WindowAdapter()public void windowClosing(WindowEvent arg)System.exit(1) ;) ;public class JCheckBoxDemo02public static void main(String args)new MyCheckBox() ;四 菜单例6 public class JMenuDemo03public static void main(String args)JFrame frame = new JFrame("Welcome To MLDN&

15、quot;) ; final JTextArea text = new JTextArea() ;text.setEditable(true) ;/ 可编辑frame.getContentPane().add(new JScrollPane(text) ;/ 加入滚动条JMenu menuFile = new JMenu("文件") ;menu(new ImageIcon("d:"+"icons"+"") ;JMenuBar menuBar = new JMenuBar() ;menuBar.add(menuFil

16、e) ;JMenuItem newItem = new JMenuItem("新建",new ImageIcon("d:"+"icons"+"new.gif") ;JMenuItem openItem = new JMenuItem("打开",new ImageIcon("d:"+"icons"+"open.gif") ;JMenuItem closeItem = new JMenuItem("关闭",new Ima

17、geIcon("d:"+"icons"+"close.gif") ;JMenuItem exitItem = new JMenuItem("退出",new ImageIcon("d:"+"icons"+"exit.gif") ;/ 此时定义完了四个菜单的选项，定义完成之后，增加快捷键newItem.setMnemonic('N') ;openItem.setMnemonic('O') ;closeItem.setMnemon

18、ic('C') ;exitItem.setMnemonic('E') ;newItem.setAccelerator(KeyStroke.getKeyStroke('N',java.awt.Event.CTRL_MASK) ;openItem.setAccelerator(KeyStroke.getKeyStroke('O',java.awt.Event.CTRL_MASK) ;closeItem.setAccelerator(KeyStroke.getKeyStroke('C',java.awt.Event.AL

19、T_MASK) ;exitItem.setAccelerator(KeyStroke.getKeyStroke('E',java.awt.Event.ALT_MASK) ;newItem.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e)text.append("= 选择了“新建”菜单项n") ;) ;openItem.addActionListener(new ActionListener()public void actionPerformed(

20、ActionEvent e)text.append("= 选择了“打开”菜单项n") ;) ;closeItem.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e)text.append("= 选择了“关闭”菜单项n") ;) ;exitItem.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e)text.append("= 选

21、择了“退出”菜单项n") ;) ;menu(newItem) ;menu(openItem) ;menu(closeItem) ;menu();/menu(exitItem) ;frame.setJMenuBar(menuBar) ;/ 菜单是需要通过此方法增加的frame.addWindowListener(new WindowAdapter()public void windowClosing(WindowEvent e)System.exit(1) ;) ;frame.setVisible(true) ;frame.setSize(500,300) ;frame.setLoca

22、tion(300,200) ;五 文件选项框例7 class Note implements ActionListenerprivate JTextArea area = new JTextArea(8,10) ;/ 定义文本区private JFrame frame = new JFrame("Welcome To MLDN") ;private JButton open = new JButton("打开文件") ;private JButton save = new JButton("保存文件") ;private JLabel

23、 label = new JLabel("现在没有打开的文件") ;private JPanel butPan = new JPanel() ;public Note()this.butPan.add(open) ;/ 在面板中加入按钮this.butPan.add(save) ;/ 在面板中加入按钮this.frame.setLayout(new BorderLayout(3,3) ;this.frame.add(this.label,BorderLayout.NORTH) ;this.frame.add(this.butPan,BorderLayout.SOUTH) ;

24、this.frame.add(new JScrollPane(this.area),BorderLayout.CENTER) ;this.frame.setSize(330,180) ;this.frame.setVisible(true) ;this.frame.addWindowListener(new WindowAdapter()public void windowClosing(WindowEvent e)System.exit(1) ;) ;this.open.addActionListener(this) ;this.save.addActionListener(this) ;p

25、ublic void actionPerformed(ActionEvent e) = null ;/ 接收文件int result = 0 ;/ 接收操作状态J = new J() ;/ 文件选择框if(e.getSource()=this.open)/ 表示执行的是打开操作this.area.setText("") ;/ 打开将文字区域的内容清空("确定") ;("打开文件") ;result = (this.frame) ;if(result=J.APPROVE_OPTION)/ 选择的是确定按钮file = () ;/ 得到选择的文件this.labe