Java GUI (graphical user interface) exercises

Java GUI (graphical user interface) exercises

6.1.3 a simple GUI Program

Package six; import javax. swing. *; import java. awt. *; import java. awt. event. *; public class Main {private static int numclicks = 0; // number of records private static JFrame frame = new JFrame ("simple GUI "); private static JLabel label = new JLabel ("button clicks:" + "0"); private static JButton button = new JButton ("Click me! ~~~ "); Private static JPanel pane = new JPanel (); // container public static void main (String [] args) {pane. setBorder (BorderFactory. createEmptyBorder (60, 60, 20, 60); pane. setLayout (new GridLayout (0, 1); // you can specify pane for the layout. add (button); pane. add (label); frame. getContentPane (). add (pane, BorderLayout. CENTER); button. setMnemonic (KeyEvent. VK_ I); button. addActionListener (new ActionListener () {// click the event public void actionreceivmed (ActionEvent e) {numclicks ++; label. setText ("button clicks:" + numclicks) ;}}); frame. setdefaclocloseoperation (JFrame. EXIT_ON_CLOSE); frame. pack (); frame. setVisible (true );}}

6.4.2 use FlowLayout layout manager

FlowLayout can automatically adjust the layout according to the window size

Package six; import javax. swing. *; import java. awt. *; import java. awt. event. *; public class Main {JButton b1, b2, b3, b4, b5; JFrame frame; // form public void display () {frame = new JFrame ("test sequence layout manager"); frame. setdefaclocloseoperation (JFrame. EXIT_ON_CLOSE); // b1 = new JButton ("button 1"); b2 = new JButton ("button 2"); b3 = new JButton ("button 3 "); b4 = new JButton ("button 4"); b5 = new JButton ("button 5"); FlowLayout flowLayout = new FlowLayout (); // The sequential layout manager Container contentPane = frame. getContentPane (); // container contentPane. setLayout (flowLayout); contentPane. add (b1); contentPane. add (b2); contentPane. add (b3); contentPane. add (b4); contentPane. add (b5); contentPane. setSize (200,100); frame. pack (); frame. setVisible (true);} public static void main (String [] args) {new Main (). display (); // silly B }}

6.4.3 use the regional layout manager BorderLayout

BorderLayout is divided into the east, west, and north, and the north and south always maintain the best height.

Package six; import javax. swing. *; import java. awt. *; import java. awt. event. *; public class Main {JButton b1, b2, b3, b4, b5; JFrame frame; // form public void display () {frame = new JFrame ("test sequence layout manager"); frame. setdefaclocloseoperation (JFrame. EXIT_ON_CLOSE); // b1 = new JButton ("button 1"); b2 = new JButton ("button 2"); b3 = new JButton ("button 3 "); b4 = new JButton ("button 4"); b5 = new JButton ("button 5"); BorderLayout borderLayout = new BorderLayout (); Container contentPane = frame. getContentPane (); // container contentPane. setLayout (borderLayout); contentPane. add (b1, BorderLayout. EAST); contentPane. add (b2, BorderLayout. WEST); contentPane. add (b3, BorderLayout. SOUTH); contentPane. add (b4, BorderLayout. NORTH); contentPane. add (b5, BorderLayout. CENTER); contentPane. setSize (200,100); frame. pack (); frame. setVisible (true);} public static void main (String [] args) {new Main (). display (); // silly B }}

6.4.5 card layout manager CardLayout

The card layout manager uses a container as a card and only one card is visible at a time.

Package six; import javax. swing. *; import java. awt. *; import java. awt. event. actionEvent; import java. awt. event. actionListener; public class Main extends JFrame {// class Main inherited from JFrameprivate JPanel pane = null; private JPanel p = null; private CardLayout card = null; private JButton button_1 = null; private JButton button_2 = null; private JButton b1 = null, b2 = null, b3 = null; private JPanel p1 = null, p2 = null, p3 = null; public Main () // {super ("card layout manager test"); try {UIManager. setLookAndFeel ("com. sun. java. swing. plaf. windows. windowsLookAndFeel ");} catch (Exception ex) {ex. printStackTrace ();} // create a new card layout card = new CardLayout (5, 5); pane = new JPanel (card); p = new JPanel (); button_1 = new JButton ("<previous"); button_2 = new JButton ("next>"); b1 = new JButton ("1 "); b2 = new JButton ("2"); b3 = new JButton ("3"); b1.setMargin (new Insets (,); b2.setMargin (new Insets, ); b3.setMargin (new Insets (,); p. add (button_1); p. add (b1); p. add (b2); p. add (b3); p. add (button_2); p1 = new JPanel (); p2 = new JPanel (); p3 = new JPanel (); p1.setBackground (Color. RED); p2.setBackground (Color. BLUE); p3.setBackground (Color. GREEN); p1.add (new JLabel ("JPanel_1"); p2.add (new JLabel ("JPanel_2"); p3.add (new JLabel ("JPanel_3"); pane. add (p1, "p1"); pane. add (p2, "p2"); pane. add (p3, "p3"); // flip card layout action button_1.addActionListener (new ActionListener () {public void actionreceivmed (ActionEvent e) {card. previous (pane) ;}}); button_2.addActionListener (new ActionListener () {public void actionreceivmed (ActionEvent e) {card. next (pane) ;}}); b1.addActionListener (new ActionListener () {public void actionreceivmed (ActionEvent e) {card. show (pane, "p1") ;}}); b2.addActionListener (new ActionListener () {public void actionreceivmed (ActionEvent e) {card. show (pane, "p2") ;}}); b3.addActionListener (new ActionListener () {public void actionreceivmed (ActionEvent e) {card. show (pane, "p3") ;}}); this. getContentPane (). add (pane); this. getContentPane (). add (p, BorderLayout. SOUTH); this. setdefaclocloseoperation (JFrame. EXIT_ON_CLOSE); this. setSize (300,200); this. setVisible (true);} public static void main (String [] args) {new Main (); // silly B }}