原子一號

Reader 讀入流


Writer 輸出流


InputStreamReader 讀入流? OutputStreamWriter 輸出流


BufferedRead BufferedWriter? 緩沖流


封裝形式
——————
功能流(字符流（字節流）)


<以上為圖片顯示，如想查看，請右鍵點擊查看圖片。或者查看相冊Java文件流。>

posted @ 2006-10-31 23:23 遲到的魚 閱讀(460) | 評論 (0) | 編輯 收藏

?1 import ?java.awt. * ;
?2 import ?java.awt.event. * ;
?3 import ?javax.swing. * ;
?4 class ?PlafPanel? extends ?JPanel {
?5 ???? public ?PlafPanel() {
?6 ????????makeButton( " Metal " , " javax.swing.plaf.metal.MetalLookAndFeel " );
?7 ????????makeButton( " Motif " , " com.sun.java.swing.plaf.motif.MotifLookAndFeel " );
?8 ????????makeButton( " Windows " , " com.sun.java.swing.plaf.windows.WindowsLookAndFeel " );
?9 ????}
10 ???? void ?makeButton(String?name, final ?String?plafName) {
11 ????????JButton?button = new ?JButton(name);
12 ????????add(button);
13 ????????button.addActionListener( new ?ActionListener() {
14 ???????????????? public ? void ?actionPerformed(ActionEvent?event) {
15 ???????????????? try {
16 ????????????????????UIManager.setLookAndFeel(plafName);
17 ????????????????????SwingUtilities.updateComponentTreeUI(PlafPanel. this );
18 ????????????????}
19 ???????????????? catch (Exception?e) {
20 ????????????????????e.printStackTrace();
21 ????????????????}
22 ????????????}
23 ????????} );
24 ????}
25 ????
26 }
27 class ?PlafFrame? extends ?JFrame {
28 ???? public ? static ? final ? int ?DEFAULT_WIDTH = 300 ;
29 ???? public ? static ? final ? int ?DEFAULT_HEIGHT = 200 ;
30 ???? public ?PlafFrame() {
31 ????????setTitle( " PlafTest " );
32 ????????setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);
33 ????????PlafPanel?panel = new ?PlafPanel();
34 ????????Container?contentPane = getContentPane();
35 ????????contentPane.add(panel);
36 ????}
37 }
38 public ? class ?PlafTest? {
39 ???? public ? static ? void ?main(String[]?args) {
40 ????????PlafFrame?frame = new ?PlafFrame();
41 ????????frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
42 ????????frame.setVisible( true );
43 ????}
44 }
45

posted @ 2006-10-19 15:05 遲到的魚 閱讀(232) | 評論 (0) | 編輯 收藏

?1 import ?java.awt. * ;
?2 import ?javax.swing. * ;
?3 import ?javax.swing.text. * ;
?4 import ?java.awt.event. * ;
?5
?6 public ? class ?TextFieldDemo? extends ?JFrame
?7 {
?8 ???? public ?TextFieldDemo()
?9 ???? {
10
11 ????????Container?contentPane = ? this .getContentPane();
12
13 ????????contentPane.setLayout( new ?FlowLayout());
14 ???????? // 內容窗格容器中加入兩個文本組件，第一個只能輸入數字????????
15 ????????DigitalText?txtDigitalText? = ? new ?DigitalText( 10 );
16 ????????JTextField?txtNormal? = ? new ?JTextField( 10 );
17 ???????? // JTextArea?txtNormal=new?JTextArea();
18 ????????contentPane.add( new ?JLabel( " 數字文本框 " ));
19 ????????contentPane.add(txtDigitalText);
20 ????????contentPane.add( new ?JLabel( " 任意文本框 " ));
21 ????????contentPane.add(txtNormal);
22
23 ????????pack();
24 ????????setVisible( true );
25 ????????setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
26 ????}
27
28 ???? public ? static ? void ?main(String?args[])?
29 ???? {
30 ?????????TextFieldDemo?frame? = ? new ?TextFieldDemo();
31 ????}
32 }
33 // 該類從JTextField中派生，只允許用戶輸入數字
34 class ?DigitalText? extends ?JTextField
35 {
36 ???? public ?DigitalText()
37 ???? {
38 ????}
39 ??????? public ?DigitalText(? int ?column)
40 ???? {
41 ???????? super (column);
42 ????}
43 ???? public ?DigitalText(String?strText,? int ?column)
44 ???? {
45 ???????? super (strText,column);
46 ????}
47 ???? protected ?Document?createDefaultModel()
48 ???? {
49 ???????? return ? new ?DigitalTextDocument();
50 ????}
51 ????
52 ???? class ?DigitalTextDocument? extends ?PlainDocument
53 ???? {
54 ???????? public ? void ?insertString(? int ?offs,?String?str,?AttributeSet?a)? throws ?BadLocationException
55 ???????? {
56 ???????????? if (?str? == ? null ?)? return ;
57 ???????????? try
58 ???????????? {
59 ????????????????Integer.parseInt(str);
60 ???????????????? super .insertString(offs,str,a);
61 ????????????}
62 ???????????? catch ?(?NumberFormatException?e)
63 ???????????? {
64 ????????????????JOptionPane.showMessageDialog( null , " 請輸入數字。 " , " 驗證錯誤 " ,JOptionPane.ERROR_MESSAGE);????????????????
65 ????????????}
66 ????????}
67 ????}
68 }

posted @ 2006-10-19 15:03 遲到的魚 閱讀(228) | 評論 (0) | 編輯 收藏

?1 import ?java.awt. * ;
?2 import ?javax.swing. * ;
?3 import ?javax.swing.text. * ;
?4 import ?java.awt.event. * ;
?5
?6 public ? class ?TextFieldDemo? extends ?JFrame
?7 {
?8 ???? public ?TextFieldDemo()
?9 ???? {
10
11 ????????Container?contentPane = ? this .getContentPane();
12
13 ????????contentPane.setLayout( new ?FlowLayout());??????
14 ????????DigitalText?txtDigitalText? = ? new ?DigitalText( 10 , 10 );
15 ????????contentPane.add( new ?JLabel( " 文本框 " ));
16 ????????contentPane.add(txtDigitalText);
17 ???????
18
19 ????????pack();
20 ????????setVisible( true );
21 ????????setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
22 ????}
23
24 ???? public ? static ? void ?main(String?args[])?
25 ???? {
26 ?????????TextFieldDemo?frame? = ? new ?TextFieldDemo();
27 ????}
28 }
29 // 用戶自定義類
30 class ?DigitalText? extends ?JTextField?
31 {
32 ???? int ?len;
33 ???? public ?DigitalText( int ?len)
34 ???? {
35 ???????? this .len = len;
36 ????}
37 ??????? public ?DigitalText(? int ?column, int ?len)
38 ???? {
39
40 ???????? super (column);
41 ???????? this .len = len;
42 ????}
43 ???? public ?DigitalText(String?strText,? int ?column, int ?len)
44 ???? {
45 ???????? super (strText,column);
46 ???????? this .len = len;
47 ????}
48 ???? protected ?Document?createDefaultModel()
49 ???? {
50 ???????? return ? new ?DigitalTextDocument();
51 ????}
52 ????
53 ???? class ?DigitalTextDocument? extends ?PlainDocument?
54 ???? {
55 ???????? public ? void ?insertString(? int ?offs,?String?str,?AttributeSet??a)? throws ?BadLocationException
56 ???????? {
57 ???????????? if (?str? == ? null ?)? return ;???????????
58 ???????????? if (( this .getLength() + str.length()) > len)
59 ??????????????? return ;
60 ???????????? super .insertString(offs,str,a);
61 ????????}
62 ????}
63
64 }

posted @ 2006-10-19 15:02 遲到的魚 閱讀(212) | 評論 (0) | 編輯 收藏

?1 import ?java.io. * ;
?2 import ?java.util. * ;
?3
?4 class ?ReadVectorObj
?5 {
?6 ???? public ? static ? void ??main?(String[]?args)
?7 ???? {
?8 ???????? try
?9 ???????? {
10 ???????????????? /**/ /* ?打開文件，讀取Vector?存放的對象數據? */
11 ????????????????FileInputStream?objfile? = ? new ?FileInputStream( " testvector.obj " );
12 ????????????????ObjectInputStream?q? = ? new ?ObjectInputStream(objfile);
13 ???????????????? /**/ /* ?獲取對象原始數據? */
14 ????????????????TestVector?myvector? = ?(TestVector)q.readObject();
15 ????????????????myvector.print();?
16 ????????}
17 ???????? catch ?(Exception?e)?
18 ???????? {
19 ????????????????e.printStackTrace();??
20 ????????}
21 ????}
22 }

posted @ 2006-10-19 14:58 遲到的魚 閱讀(213) | 評論 (0) | 編輯 收藏

?

?1 import ?java.io. * ;
?2 import ?java.util. * ;
?3
?4 class ?TestVector? implements ?java.io.Serializable
?5 {
?6 ???? private ?Vector?vect = new ?Vector();
?7 ????
?8 ???? public ? void ?add(Object?obj)
?9 ???? {
10 ???????????? this .vect.add(obj);
11 ????}
12 ???? public ? void ?print()
13 ???? {
14 ????????????System.out.println( this .vect);
15 ????}
16 ???? public ? static ? void ?main(String[]?args)
17 ???? {
18 ???????? try ?
19 ???????? {
20 ???????????? /**/ /* ?將對象寫到一個文件里? */
21 ????????????FileOutputStream?objfile? = ? new ?FileOutputStream( " testvector.obj " );
22 ???????????? /**/ /* ?創建一個輸出流? */
23 ????????????ObjectOutputStream?p? = ? new ?ObjectOutputStream(objfile);
24 ???????????? /**/ /* ?創建一個TestVector對象? */
25 ????????????TestVector?tv? = new ?TestVector();
26 ???????????? /**/ /* 給Vector寫入幾String個對象 */
27 ????????????tv.add( " One " );
28 ????????????tv.add( " Two " );
29 ????????????tv.add( " Three " );
30 ????????????p.writeObject(tv);? // ?把tv寫入流
31 ????????????p.flush();
32 ????????????objfile.close();???? // ?關閉文件對象
33 ????????} ?
34 ???????? catch ?(Exception?e)?
35 ???????? {
36 ????????????e.printStackTrace();
37 ????????}
38 ????}
39 }

posted @ 2006-10-19 14:56 遲到的魚 閱讀(175) | 評論 (0) | 編輯 收藏