Bài giảng Java 2 - Trần Duy Thanh - Introduction

e method and take false value 3. Common Control 30 JTextField To set Text in code behind for JTextField: txtTen.setText("Hello Tèo"); To get Text from JTextField: String s=txtTen.getText(); We could convert data: int n=Integer.parseInt(s); double d=Double.parseDouble(s); float f=Float.parseFloat(s); To set focus:txtTen.requestFocus(); 3. Common Control 31 JTextArea Input data multi line JLabel lblDes=new JLabel("Mô tả:"); JTextArea are=new JTextArea(5, 15); JScrollPane sc=new JScrollPane(are); add(lblDes);add(sc); JTextArea are=new JTextArea(5, 15); 5 rows, 15 columns We should use JScrollPane to create Scroll for JTextArea when user input data over limit row or column 3. Common Control 32 ButtonGroup & JRadioButton Make single choice Must add JRadioButton into the ButtonGroup if(rad1.isSelected()) { } 33 ButtonGroup & JRadioButton JPanel pnGroup=new JPanel(); pnGroup.setLayout(new BoxLayout(pnGroup, BoxLayout.Y_AXIS)); Border bor=BorderFactory.createLineBorder(Color.RED); TitledBorder titlebor=new TitledBorder(bor, "Chọn nè:"); pnGroup.setBorder(titlebor); JRadioButton rad1=new JRadioButton("Rất hài lòng"); JRadioButton rad2=new JRadioButton("Hài lòng"); JRadioButton rad3=new JRadioButton("Tạm chấp nhận"); JRadioButton rad4=new JRadioButton("Không chấp nhận"); ButtonGroup group=new ButtonGroup(); group.add(rad1);group.add(rad2); group.add(rad3);group.add(rad4); pnGroup.add(rad1);pnGroup.add(rad2); pnGroup.add(rad3);pnGroup.add(rad4); add(pnGroup); 34 ButtonGroup & JRadioButton Create Border with title: Border bor=BorderFactory.createLineBorder(Color.RED); TitledBorder titlebor=new TitledBorder 	(bor, "Chọn nè:"); pnGroup.setBorder(titlebor); Define a buttongroup to add all radio: ButtonGroup group=new ButtonGroup(); group.add(rad1); And add all Radio into the pnGroup: pnGroup.add(rad1); Add pnGroupd into the Window: add(pnGroup); 3. Common Control 35 JCheckBox Make multi choice JPanel pnCheck=new JPanel(); pnCheck.setLayout(new GridLayout(2, 2)); Border bor2=BorderFactory .createEtchedBorder(Color.BLUE, Color.RED); TitledBorder titlebor2= new TitledBorder(bor2, "Môn học yêu thích:"); pnCheck.setBorder(titlebor2); JCheckBox chk1=new JCheckBox("Java"); JCheckBox chk2=new JCheckBox("F Sharp"); JCheckBox chk3=new JCheckBox("C Sharp"); JCheckBox chk4=new JCheckBox("Ruby"); pnCheck.add(chk1);pnCheck.add(chk2); pnCheck.add(chk3);pnCheck.add(chk4); add(pnCheck); 3. Common Control 36 JCheckBox Make multi choice Set grid layout 2 rows and 2 column pnCheck.setLayout(new GridLayout(2, 2)); Create JCheckBox: JCheckBox chk1=new JCheckBox("Java"); Add chk1 into the pnCheck: pnCheck.add(chk1); Add pnCheck into the Window: add(pnCheck); BorderFactory.createEtchedBorder(Color.BLUE, Color.RED); Create border with 2 color: Blue, Red: if(chk1.isSelected()) { //do something } 3. Common Control 37 JComboBox JComboBox cbo=new JComboBox(); cbo.addItem("Xuất sắc"); cbo.addItem("Giỏi"); cbo.addItem("Khá"); cbo.addItem("Trung bình"); add(cbo); String arr[]={"Xuất sắc" ,"Giỏi" ,"Khá","Trung bình"}; JComboBox cbo=new JComboBox(arr); add(cbo); 3. Common Control 38 JComboBox int n=cbo.getSelectedIndex(); n is position that we selected Object o=cbo.getSelectedItem(); We could cast object to valid another type cbo.setSelectedIndex(-1); To clear selection 3. Common Control 39 JComboBox class Person { private String Id; private String Name; public Person(String id,String name){ Id=id; Name=name; } public String toString() { return Name; } } How to add Array Person to JComboBox? 3. Common Control 40 JComboBox How to add Array Person to JComboBox? Person []list={ new Person("1", "Trần Thành Công"), new Person("2", "Nguyễn Đại Thắng"), new Person("3", "Hoàng Thành Đạt")}; JComboBox cbo2=new JComboBox(list); add(cbo2); We get Person from selected: Person p=(Person)cbo2.getSelectedItem(); 3. Common Control 41 JList 	Person []list={ new Person("1", "Đỗ Công Thành"), new Person("2", "Nguyễn Văn Hùng"), new Person("3", "Trần Duy Thanh"), new Person("4", "Đoàn Ái Nương"), … new Person("10", "Đào Cẩm Hằng") }; JList jl=new JList(list); jl.setSelectionBackground(Color.RED); jl.setSelectionForeground(Color.WHITE); JScrollPane scjl=new JScrollPane(jl, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); add(scjl); 3. Common Control 42 JList ListSelectionModel ListSelectionModel.SINGLE_SELECTION; ListSelectionModel.SINGLE_INTERVAL_SELECTION; ListSelectionModel.MULTIPLE_INTERVAL_SELECTION; jl.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION) int n=jl.getSelectedIndex(); int m[]=jl.getSelectedIndices(); Object o=jl.getSelectedValue(); Object arr[]=jl.getSelectedValues(); 4. Event Listener 43 Inline anonymous listener Listener in variable Listener class 4. Event Listener 44 Inline anonymous listener JButton btn1=new JButton("Say Hello!"); btn1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { JOptionPane.showMessageDialog(null, "Hello tèo"); } }); 4. Event Listener 45 Inline anonymous listener btn1.addMouseListener(new MouseListener() { public void mouseReleased(MouseEvent arg0) { } public void mousePressed(MouseEvent arg0) { } public void mouseExited(MouseEvent arg0) { } public void mouseEntered(MouseEvent arg0) { } public void mouseClicked(MouseEvent arg0) { } }); 4. Event Listener 46 Listener in variable Hold a reference to the Listener in a variable 	 could share event ActionListener btnClick=new ActionListener() { public void actionPerformed(ActionEvent arg0) { JOptionPane.showMessageDialog(null, "Click!"); } }; btn1.addActionListener(btnClick); btn2.addActionListener(btnClick); As the same for mouse events 4. Event Listener 47 Listener class private class MyClick implements ActionListener { @Override public void actionPerformed(ActionEvent arg0) { // TODO Auto-generated method stub } } btn1.addActionListener(new MyClick()); Could use class event anywhere 48 5. Dialogbox JOptionPane JOptionPane.showMessageDialog(null,"Hello Tèo"); int ret=JOptionPane.showConfirmDialog(null,"Thoát hả?","Thoát",JOptionPane.YES_NO_OPTION); if(ret==JOptionPane.YES_OPTION) { } String s=JOptionPane.showInputDialog("Nhập :"); 6. Advanced Control 49 JScrollpane JTable JTree JMenuBar JToolBar 50 JScrollpane Provides a scrollable view of a lightweight component. A JScrollPane manages a viewport, optional vertical and horizontal scroll bars, and optional row and column heading viewports.  ImageIcon img=new ImageIcon("baby.jpg"); JLabel lblImg=new JLabel(img); JScrollPane scimg=new JScrollPane(lblImg, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); scimg.setPreferredSize(new Dimension(600, 500)); add(scimg); 51 JTable The JTable is used to display and edit regular two-dimensional tables of cells. 52 JTable DefaultTableModel dm=new DefaultTableModel(); dm.addColumn("Mã"); dm.addColumn("Tên");	 dm.addColumn("Tuổi"); final JTable tbl=new JTable(dm); dm.addRow(new String[]{"112","Ngô văn Bắp","21"}); dm.addRow(new String[]{"113","Nguyễn Thị Tý","18"}); dm.addRow(new String[]{"114","Trần Văn Tèo","22"}); JScrollPane sc=new JScrollPane(tbl); Container con=getContentPane(); con.setLayout(new BorderLayout()); con.add(sc,BorderLayout.CENTER); 53 JTable How to handle event : Mouse, Key from JTable? tbl.addMouseListener(new MouseListener() { public void mouseReleased(MouseEvent e) {} public void mousePressed(MouseEvent e) {} public void mouseExited(MouseEvent e) {} public void mouseEntered(MouseEvent e) {} public void mouseClicked(MouseEvent e) { int row=tbl.getSelectedRow(); int col=tbl.getSelectedColumn(); String s=(String)tbl.getValueAt(row, col); JOptionPane.showMessageDialog(null, s); }}); 54 JTable How to handle event : Mouse, Key from JTable? tbl.addKeyListener(new KeyListener() { public void keyTyped(KeyEvent arg0) {} public void keyReleased(KeyEvent arg0) { int row=tbl.getSelectedRow(); int col=tbl.getSelectedColumn(); String s=(String)tbl.getValueAt(row, col); JOptionPane.showMessageDialog(null, s); } public void keyPressed(KeyEvent arg0) {} }); 55 JTable dm.setRowCount(0); Clear all data from JTable dm.addRow( new String[]{"ID_002","Võ Tòng","32"}); Vectorvec=new Vector(); vec.add("ID_003"); vec.add("Lâm Sung"); vec.add("30"); dm.addRow(vec); 2 Ways to add new Row: dm.getRowCount(); Get total row from JTable 56 JTree A control that displays a set of hierarchical data as an outline. DefaultMutableTreeNode root= new DefaultMutableTreeNode("ĐH Công Nghiệp"); final JTree tree=new JTree(root); DefaultMutableTreeNode cnttNode=new DefaultMutableTreeNode("Công Nghệ TT"); root.add(cnttNode); DefaultMutableTreeNode dhth1Node=new DefaultMutableTreeNode("Lớp ĐHTH1"); cnttNode.add(dhth1Node); 57 JTree Handle event tree.addMouseListener(new MouseListener() { public void mouseReleased(MouseEvent e) {} public void mousePressed(MouseEvent e) {} public void mouseExited(MouseEvent e) {} public void mouseEntered(MouseEvent e) {} public void mouseClicked(MouseEvent e) { Object o=tree.getLastSelectedPathComponent(); DefaultMutableTreeNode 	node=(DefaultMutableTreeNode)o; JOptionPane.showMessageDialog(null, node); } }); 58 JMenuBar JMenuBar menubar=new JMenuBar(); setJMenuBar(menubar); JMenu mnuFile=new JMenu("File"); JMenu mnuEdit=new JMenu("Edit"); menubar.add(mnuFile); menubar.add(mnuEdit); JMenuItem mnuFileNew=new JMenuItem("New"); JMenuItem mnuFileOpen=new JMenuItem("Open"); JMenuItem mnuFileExit=new JMenuItem("Exit"); mnuFile.add(mnuFileNew); mnuFile.add(mnuFileOpen); mnuFile.addSeparator(); mnuFile.add(mnuFileExit); 59 JMenuBar Handle event as the same JButton mnuFileExit.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { System.exit(0); } }); 6. Advanced Control 60 JToolBar JToolBar toolBar=new JToolBar("MyBar"); JButton btn1=new JButton("New"); JCheckBox chk1=new JCheckBox("Checkme"); toolBar.add(btn1); toolBar.add(chk1); JButton btn2=new JButton("Exit"); toolBar.add(btn2); add(toolBar,BorderLayout.NORTH); Handle event as the same JButton END 61