Lập trình components

LẬP TRÌNH JAVA CSDL BÀI 3 COMPONENTS Nguyễn Hữu Thể 1 .Nội dung JLabel JButton JTextField JCheckBox JRadioButton JPanel JComboBox, JList JTable JMenu JToolBar JOptionPane JFileChooser 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", 4 "Green", "Blue"}); .Working with Components 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 .