Bài giảng Lập trình Cơ sở dữ liệu – Java: Bài 3.1 - Nguyễn Hữu Thể

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Bài giảng Lập trình cơ sở dữ liệu Java - Bài 3: Components. Chương này cung cấp cho người học các nội dung: JTable, JButton, JMenu, JTextField, JToolBar, JCheckBox, JOptionPane, JRadioButton, JFileChooser, JPanelJComboBox, JList. Mời các bạn cùng tham khảo nội dung chi tiết.

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LẬP TRÌNH JAVA CSDL BÀI 3 COMPONENTS Nguyễn Hữu Thể 1
Nội dung  JLabel  JTable  JButton  JMenu  JTextField  JToolBar  JCheckBox  JOptionPane  JRadioButton  JFileChooser  JPanel  JComboBox, JList 2
GUI Components  JButton, JLabel, JTextField, JCheckBox, JRadioButton, and JComboBox.  Each GUI component class provides several constructors that you can use to create GUI component objects. 3
GUI Components // Create a button with text OK JButton btOK = new JButton("OK"); // Create a label with text "Enter your name: " JLabel lbName = new JLabel("Enter your name: "); // Create a text field with text "Type Name Here" JTextField txtName = new JTextField("Type Name Here"); // Create a check box with text bold JCheckBox chkBold = new JCheckBox("Bold"); // Create a radio button with text red JRadioButton rbRed = new JRadioButton("Red"); // Create a combo box with choices red, green, blue JComboBox cboColor = new JComboBox(new String[]{"Red", "Green", "Blue"}); 4
Working with Components  javax.swing.Jcomponent  Several methods:  setEnabled(boolean): receive user input (an argument of true) or is inactive and cannot receive input (false). Components are enabled by default.  isEnabled() returns a boolean value.  setVisible(boolean): for all components. Use true to display a component and false to hide it.  isVisible()  setSize(int, int): width and height specified as arguments  setSize(Dimension) uses a Dimension  getSize(): returns a Dimension object with height and width 5
Working with Components  setText()  getText()  setValue() and getValue() for components that store a numeric value. 6
JLabel  Display Text, not editable  Constructor:  Label() : An empty label  JLabel(String) : A label with the specified text  JLabel(String, int) : A label with the specified text and alignment LEFT, CENTER, and RIGHT.  JLabel(String, Icon, int) : A label with the specified text, icon, and Alignment 7
JLabel Common Methods:  void setFont (Font f)  void setText(String S)  String getText()  void setIcon(Icon) 8
JLabel  Example: JLabel lbl=new JLabel("Họ và tên:"); JLabel lbl=new JLabel("Ngày sinh:"); 9
JLabel  The use of HTML is supported by most Swing components.  Example: use HTML markup to create multiline and multifont labels: JLabel lbHoten = new JLabel("Dòng 1Dòng 2"); 10
JTextField  Display data, Input data  Constructors  JTextField(): An empty text field  JTextField(int): A text field with the specified width  JTextField(String): A text field with text  JTextField(String, int): A text field with the specified text and width  Common Methods  void setText(String S)  String getText()  void setEditable(boolean b)  boolean isEditable()
JTextField  Example setLayout(new FlowLayout()); JLabel lbHoten = new JLabel("Nhập họ và tên"); add(lbHoten); JTextField txtHoten = new JTextField(20); add(txtHoten);
JTextField  Don’t allow input data txtHoten.setEditable(false)  To set Text in code behind for JTextField txtHoten.setText("Hello world");  To get Text from JTextField String s = txtHoten.getText();  We could convert data int n = Integer.parseInt(s); //s is String double d = Double.parseDouble(s); float f = Float.parseFloat(s);  To set focus: txtHoten.requestFocus();
JPasswordField  Hide the characters a user is typing into the field.  JPasswordField class, a subclass of JTextField.  JPasswordField constructor methods take the same arguments as those of its parent class.  Methods:  JPasswordField(String text, int columns)  char[] getPassword(): returns the text contained in this password field
JPasswordField  setEchoChar(char): replacing each input character with the specified character JPasswordField pass = new JPasswordField(20); pass.setEchoChar('#');
JTextArea  Input is more than one line long  Constructors  JTextArea(): Create a default text area.  JTextArea(int rows, int columns): Create a text area with the specified number of rows and columns.  JTextArea(String text)  JTextArea(String text, int rows, int columns)  JTextArea(Document doc): Create a text area that uses the specified Document.  JTextArea(Document doc, String text, int rows, int columns)
JTextArea  Common methods  void append(String str)  Append the given text to the end of the document.  void insert(String str, int pos)  Insert the specified text at the given position . To insert text at the beginning of the document, use a position of 0.  void replaceRange(String str, int start, int end)  Replace a section of the document
JTextArea  public int getLineStartOffset(int line) throws BadLocationException  Return the character offset (from the beginning) that marks the beginning of the specified line number.  public int getLineEndOffset(int line) throws BadLocationException  Return the character offset (from the beginning) that marks the end of the specified line number. This is actually the offset of the first character of the next line.  public int getLineOfOffset(int offset) throws BadLocationException  Return the line number that contains the given character offset (from the beginning of the document).
JTextArea JPanel contentPane = new JPanel(); JLabel lblNewLabel = new JLabel("Nhập dữ liệu:"); contentPane.add(lblNewLabel); JTextArea textArea = new JTextArea(3,15); textArea.setWrapStyleWord(true); textArea.setLineWrap(true); JScrollPane scrollPane = new JScrollPane(textArea); contentPane.add(scrollPane);
class MyJTextArea extends JFrame { private JPanel contentPane; JTextArea public MyJTextArea() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 257, 128); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5)); JLabel lblNewLabel = new JLabel("Nhập dữ liệu:"); contentPane.add(lblNewLabel); JScrollPane scrollPane = new JScrollPane(); JTextArea textArea = new JTextArea(3,15); textArea.setWrapStyleWord(true); textArea.setLineWrap(true); scrollPane.setViewportView(textArea); contentPane.add(scrollPane); }