JAVA learning Swing chapter button component JButton simple learning, swingjbutton

JAVA learning Swing chapter button component JButton simple learning, swingjbutton

Package com. swing; import java. awt. container; import java. awt. dimension; import java. awt. gridLayout; import java. awt. event. actionEvent; import java. awt. event. actionListener; import java.net. URL; import javax. swing. icon; import javax. swing. imageIcon; import javax. swing. JButton; import javax. swing. JFrame; import javax. swing. JOptionPane; import javax. swing. windowConstants;/*** 1: A button is a common component in Swing, used to trigger a specific action * Swin G provides multiple buttons, including the submit button, check box, and single-choice button. * these buttons are inherited from the AbstractButton class. ** 2: The submit button component (JButton) in Swing) the JButton object indicates that * JButton contains four main constructor Methods * parameter text. The icon indicates that the text label and icon are displayed. ** 3: This example uses two methods to create buttons, the first is to assign the button Icon and text * to the initialization button. You must first obtain the image path and then instantiate the path to the Icon, then, load the Button. * The second method is to create a Button object without defining icons and text, and then use the * setIcon () method to create an icon for the Button. * The setToolTipText () method sets the prompt text for the button, and you can move the cursor over the button. * The setBorderPainted () method sets whether the boundary shows * setMaximumSize () the size of the button set by the method is the same as that of the icon. The parameter type required by this method is * Dimension class object, so that the image is placed in the form just like a button, * You can also use the setEnabled () method to set whether the button is available ** @ author biexiansheng **/public class JButtonTest extends JFrame {public JButtonTest () {// define a constructor // obtain the URL of the image. Pay attention to the following two lines of code: URL url = JButtonTest. class. getResource ("imageButtoo.jpg"); Icon icon = new ImageIcon (url ); // instantiate the Icon object // set the grid layout manager to 3 rows, 2 columns, horizontal 5 Vertical 5 setLayout (new GridLayout )); // create Container container Container = getContentPane (); for (int I = 0; I <5; I ++) {// create button, set the button text and icon JButton jb = new JButton ("button" + I, icon); container. add (jb); // add the button to the container if (I % 2 = 0) {jb. setEnabled (false); // set some of the buttons to be unavailable} // instantiate JButton jb2 = new JButton (); // instantiate a button without text and image jb2.setMaximumSize (new Dimension (90,30); // set the button to the same size as the image jb2.setIcon (icon ); // set the icon jb2.setHideActionText (true) for the button; jb2.setToolTipText ("image button"); // The prompt for setting the button is jb2.setBorderPainted (false ); // The jb2.addActionListener (new ActionListener () {@ Override public void actionreceivmed (ActionEvent e) {// TODO Auto-generated method stub // The JOptionPane dialog box is displayed. showMessageDialog (null, "pop-up dialog box") ;}}); container. add (jb2); // add the button to the container setTitle ("submit button component button"); // set the window title setVisible (true ); // set the window visualization setSize (500,550); // set the window size // set the window closing method setdefaclocloseoperation (WindowConstants. EXIT_ON_CLOSE);} public static void main (String [] args) {// TODO Auto-generated method stub JButtonTest jb = new JButtonTest ();}}

The running result of the case is as follows:

 

 

 

Package com. swing; import java. awt. borderLayout; import java. awt. container; import java. awt. event. actionEvent; import java. awt. event. actionListener; import javax. swing. JCheckBox; import javax. swing. JFrame; import javax. swing. JPanel; import javax. swing. JScrollPane; import javax. swing. JTextArea; import javax. swing. windowConstants;/*** 1: check box component JCheckBox * is widely used in Swing components and has a square icon, A section of descriptive text is added. * The check box is different from the single-choice button. Each check box provides two statuses: select and not select. ** @ author biexiansheng **/public class CheckBoxTest extends JFrame {private JPanel jp1 = new JPanel (); // initialize the Panel object private JPanel jp2 = new JPanel (); //// if a scrolling panel is added, JTextArea must be added first and the size of the compiler must be specified. private JTextArea jt = new JTextArea (20, 50 ); // create the text domain component private JCheckBox jc1 = new JCheckBox (); // instantiate the check button private JCheckBox jc2 = new JCheckBox (); // private JCheckBox jc3 = new JCheckBox (); // public CheckBoxTest () {// set to a constructor Container container = getContentPane (); // create a container // set the layout manager Container. setLayout (new BorderLayout (); // initialize the border layout manager container. add (jp1, BorderLayout. NORTH); // Add to the container final JScrollPane js = new JScrollPane (jt); // create a JScrollPane panel object/* if you need to place multiple components in the JScrollPane panel, you need to place multiple components on the JPanel * and add the JPanel as a whole component to the JScrollPane component **/jp1.add (js); container. add (jp2, BorderLayout. SOUTH); jp2.add (jc1); jc1.addActionListener (new ActionListener () {@ Override public void actionreceivmed (ActionEvent e) {// TODO Auto-generated method stub jt. append ("check box 1 Selected \ n") ;}}); jp2.add (jc2); jc2.addActionListener (new ActionListener () {@ Override public void actionreceivmed (ActionEvent e) {// TODO Auto-generated method stub jt. append ("check box 2 Selected \ n") ;}}); jp2.add (jc3); jc3.addActionListener (new ActionListener () {@ Override public void actionreceivmed (ActionEvent e) {// TODO Auto-generated method stub jt. append ("check box 3 selected \ n") ;}}); setTitle ("use of check box"); setSize (600,650); setVisible (true); setdefaclocloseoperation (WindowConstants. EXIT_ON_CLOSE);} public static void main (String [] args) {// TODO Auto-generated method stub CheckBoxTest cb = new CheckBoxTest (); // call the constructor during instantiation }}

The instance running result is as follows:

In order to differentiate the running, special colors are added.

Be familiar with the color control of each panel

 

 

Package com. swing; import java. awt. container; import javax. swing. buttonGroup; import javax. swing. JButton; import javax. swing. JFrame; import javax. swing. JLabel; import javax. swing. JPanel; import javax. swing. JRadioButton; import javax. swing. windowConstants;/*** 1: by default, the single-choice button JRadioButton displays a circular icon, and usually places * Descriptive text next to the icon, while in the application, generally, multiple single-choice buttons are placed in the button group to make these single-choice buttons * show a certain function. When a user selects a single-choice button, other buttons in the button group will be automatically canceled. ** 2: the single-choice button is the JRadioButton class object in the Swing component, which is a subclass of JToggleButton * and the JToggleButton class is a subclass of the javasactbutton class, therefore, many methods to control single-choice buttons are in the * AbstractButton class. ** 3: A ButtonGroup class exists in Swing to generate a button group. * If you want to place all the single-choice buttons in the button group, you need to instantiate a JRadioButton object * and use this object to call add () method Add single-choice button * @ author biexiansheng **/public class extends JFrame {private JRadioButton jr1 = new JRadioButton (); private JRadioButton jr2 = new JRadioButton (); private JRadioButton jr3 = new JRadioButton (); // initialize a single-choice button // instantiate a single-choice button group private ButtonGroup group = new ButtonGroup (); private JPanel jp = new JPanel (); // initialize the Panel public JRadioButtonTest () {Container container = getContentPane (); // create a Container group. add (jr1); group. add (jr2); group. add (jr3); jp. add (jr1); jp. add (jr2); jp. add (jr3); // add the radio button to the Panel container. add (jp); // add the panel to the container // set the container feature setTitle ("simple exercise for single-choice buttons"); // The container title setVisible (true ); // visualized setSize (200,150); // container size // set the container closing method setdefaclocloseoperation (WindowConstants. EXIT_ON_CLOSE);} public static void main (String [] args) {// TODO Auto-generated method stub JRadioButtonTest jb = new JRadioButtonTest ();}}

The running result of a simple instance is as follows:

This example briefly describes how to implement the single-choice button without any response. It is only a Case demonstration.

 

Package com. swing; import java. awt. color; import java. awt. container; import java. awt. gridLayout; import javax. swing. buttonGroup; import javax. swing. JButton; import javax. swing. JCheckBox; import javax. swing. JFrame; import javax. swing. JLabel; import javax. swing. JPanel; import javax. swing. JRadioButton; import javax. swing. windowConstants; public class Test extends JFrame {private JRadioButton jr1; private extends jr2; private ButtonGroup bg1; private JCheckBox cb1; private JCheckBox cb2; private JCheckBox cb3; private JLabel jl1; private JLabel jl2; private JPanel jp1; private JPanel jp2; private JPanel jp3; private JButton jb1; private JButton jb2; public Test () {Container container = getContentPane (); // create a container cb1 = new JCheckBox ("basketball"); cb2 = new JCheckBox ("soccer"); cb3 = new JCheckBox ("Volleyball "); jl1 = new JLabel ("your favorite sports"); jl2 = new JLabel ("your gender"); jb1 = new JButton ("Submit "); jb2 = new JButton ("reset"); jr1 = new JRadioButton ("male"); jr2 = new JRadioButton ("female"); bg1 = new ButtonGroup (); setLayout (new GridLayout (3, 1); // set jp1 = new JPanel (); jp1.add (jl1); jp1.add (cb1 ); // Add the single-choice button to the Panel jp1.add (cb2), jp1.add (cb3), and container. add (jp1); jp2 = new JPanel (); jp2.add (jl2); bg1.add (jr1); // add the single button to the ButtonGroup bg1.add (jr2 ); jp2.add (jr1); jp2.add (jr2); container. add (jp2); jp3 = new JPanel (); jp3.add (jb1); jp3.add (jb2); container. add (jp3); setTitle ("button usage"); setSize (400,300); setVisible (true); setdefaclocloseoperation (WindowConstants. EXIT_ON_CLOSE);} public static void main (String [] args) {// TODO Auto-generated method stub new Test ();}}

The running result of the case is as follows: