Java by API/javax.swing/JFrame
Содержание
- 1 JFrame: addComponentListener(ComponentListener l)
- 2 JFrame: addContainerListener(ContainerListener l)1
- 3 JFrame: addMouseWheelListener(MouseWheelListener l)
- 4 JFrame: addWindowListener(WindowListener lis)
- 5 JFrame.DISPOSE_ON_CLOSE
- 6 JFrame.DO_NOTHING_ON_CLOSE
- 7 JFrame.EXIT_ON_CLOSE
- 8 JFrame: getAccessibleContext()
- 9 JFrame: getContentPane().getActionMap() [Bind key action to JFrame]
- 10 JFrame: getDefaultCloseOperation()
- 11 JFrame: getFontMetrics(Font font)
- 12 JFrame: getGlassPane()
- 13 JFrame: getLayeredPane()
- 14 JFrame: isFocusOwner()
- 15 JFrame: isUndecorated()
- 16 JFrame: processWindowEvent(WindowEvent e)
- 17 JFrame: setAlwaysOnTop(boolean alwaysOnTop)
- 18 JFrame: setBackground(Color c)
- 19 JFrame: setCursor(Cursor c)
- 20 JFrame: setDefaultButton(JButton bn) (Remove "Enter" key stroke from JTextField)
- 21 JFrame: setDefaultButton(JButton defaultButton)
- 22 JFrame: setDefaultCloseOperation(int option)
- 23 JFrame: setDefaultLookAndFeelDecorated(boolean b)
- 24 JFrame: setExtendedState(int state)
- 25 JFrame: setFocusable(boolean focusable)
- 26 JFrame: setFocusableWindowState(boolean focusableWindowState)
- 27 JFrame: setFocusTraversalPolicy(FocusTraversalPolicy lo)
- 28 JFrame: setIconImage(Image image)
- 29 JFrame: setJMenuBar(JMenuBar bar)
- 30 JFrame: setLocationByPlatform(boolean locationByPlatform)
- 31 JFrame: setLocation(int x, int y)
- 32 JFrame: setLocationRelativeTo(Component c)
- 33 JFrame: setMaximizedBounds(Rectangle bounds)
- 34 JFrame: setSize(int width, int height)
- 35 JFrame: setTitle(String title)
- 36 JFrame: setUndecorated(boolean b)
- 37 JFrame: setVisible(boolean visible)
JFrame: addComponentListener(ComponentListener l)
<source lang="java">
import java.awt.ruponent; import java.awt.Dimension; import java.awt.Point; import java.awt.event.ruponentAdapter; import java.awt.event.ruponentEvent; import java.awt.event.ruponentListener; import javax.swing.JFrame; public class Main {
public static void main() {
ComponentListener listener = new ComponentAdapter() {
public void componentShown(ComponentEvent evt) {
Component c = (Component) evt.getSource();
System.out.println("Component is now visible");
}
public void componentHidden(ComponentEvent evt) {
Component c = (Component) evt.getSource();
System.out.println("Component is now hidden");
}
public void componentMoved(ComponentEvent evt) {
Component c = (Component) evt.getSource();
Point newLoc = c.getLocation();
System.out.println("Get new location");
}
public void componentResized(ComponentEvent evt) {
Component c = (Component) evt.getSource();
Dimension newSize = c.getSize();
System.out.println("Get new size");
}
};
JFrame frame = new JFrame();
frame.setSize(300, 300);
frame.addComponentListener(listener);
frame.setVisible(true);
}
}
</source>
JFrame: addContainerListener(ContainerListener l)1
<source lang="java">
import java.awt.ruponent; import java.awt.Container; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ContainerEvent; import java.awt.event.ContainerListener; import javax.swing.JButton; import javax.swing.JFrame; public class Main {
public static void main(String args[]) {
JFrame frame = new JFrame();
Container contentPane = frame.getContentPane();
ContainerListener cont = new ContainerListener() {
ActionListener listener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("Selected: " + e.getActionCommand());
}
};
public void componentAdded(ContainerEvent e) {
Component c = e.getChild();
if (c instanceof JButton) {
JButton b = (JButton) c;
b.addActionListener(listener);
}
}
public void componentRemoved(ContainerEvent e) {
Component c = e.getChild();
if (c instanceof JButton) {
JButton b = (JButton) c;
b.removeActionListener(listener);
}
}
};
contentPane.addContainerListener(cont);
contentPane.setLayout(new GridLayout(3, 2));
contentPane.add(new JButton("First"));
contentPane.add(new JButton("Second"));
contentPane.add(new JButton("Third"));
contentPane.add(new JButton("Fourth"));
contentPane.add(new JButton("Fifth"));
frame.setSize(300, 200);
frame.show();
}
}
</source>
JFrame: addMouseWheelListener(MouseWheelListener l)
<source lang="java">
import java.awt.Graphics; import java.awt.event.MouseWheelEvent; import java.awt.event.MouseWheelListener; import java.awt.image.BufferedImage; import java.io.File; import javax.imageio.ImageIO; import javax.swing.JFrame; public class Main extends JFrame {
private BufferedImage bi;
private int zoom = 0;
private static final double ZOOM_AMOUNT = 1.1;
public static void main(String[] args) {
new Main("your.jpg").setVisible(true);
}
private void sizeToZoom() {
double factor = Math.pow(ZOOM_AMOUNT, zoom);
setSize((int) (bi.getWidth() * factor), (int) (bi.getHeight() * factor));
}
public Main(String filename) {
setDefaultCloseOperation(EXIT_ON_CLOSE);
try {
bi = ImageIO.read(new File(filename));
} catch (Exception e) {
e.printStackTrace();
}
sizeToZoom();
addMouseWheelListener(new MouseWheelListener() {
public void mouseWheelMoved(MouseWheelEvent e) {
int steps = e.getWheelRotation();
zoom += steps;
sizeToZoom();
}
});
}
public void paint(Graphics g) {
g.drawImage(bi, 0, 0, getWidth(), getHeight(), this);
}
}
</source>
JFrame: addWindowListener(WindowListener lis)
<source lang="java">
import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel {
public MainClass() {
JButton btn1 = new JButton("Button1");
add(btn1);
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.getContentPane().add(new MainClass());
//frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.addWindowListener(new FrameListener());
frame.setSize(200, 200);
frame.setVisible(true);
}
} class FrameListener extends WindowAdapter {
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
</source>
JFrame.DISPOSE_ON_CLOSE
<source lang="java">
import java.awt.Font; import java.awt.GraphicsEnvironment; import javax.swing.JFrame; import javax.swing.JLabel; public class Main extends JFrame {
private String textMessage = "Java Internationalization";
public Main() {
super("TrueType Font Demonstration");
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
ge.getAllFonts();
Font font = new Font("Jokerman", Font.PLAIN, 35);
JLabel textLabel = new JLabel(textMessage);
textLabel.setFont(font);
getContentPane().add(textLabel);
setVisible(true);
}
public static void main(String[] args) {
JFrame frame = new Main();
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
}
</source>
JFrame.DO_NOTHING_ON_CLOSE
<source lang="java">
import javax.swing.JFrame; public class Main {
public static void main(String[] argv) throws Exception {
// Create a frame
JFrame frame = new JFrame();
// Get default close operation
int op = frame.getDefaultCloseOperation(); // HIDE_ON_CLOSE
// Set to ignore the button
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
}
}
</source>
JFrame.EXIT_ON_CLOSE
<source lang="java">
/*
* Output: * */
import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel {
public void paint(Graphics g) {
Dimension d = this.getPreferredSize();
int fontSize = 20;
g.setFont(new Font("TimesRoman", Font.PLAIN, fontSize));
g.setColor(Color.red);
g.drawString("www.jexp.ru", 10, 20);
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.getContentPane().add(new MainClass());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(200,200);
frame.setVisible(true);
}
}
</source>
JFrame: getAccessibleContext()
<source lang="java">
import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.accessibility.AccessibleContext; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JFrame implements ActionListener {
JButton jb;
MainClass(String title) {
super(title);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
AccessibleContext ac = getAccessibleContext();
ac.setAccessibleDescription("Accessibility Demo1 description.");
ac = getRootPane().getAccessibleContext();
ac.setAccessibleName("Root pane");
ac.setAccessibleDescription("Root pane description");
ac = getGlassPane().getAccessibleContext();
ac.setAccessibleName("Glass pane");
ac.setAccessibleDescription("Glass pane description");
ac = getLayeredPane().getAccessibleContext();
ac.setAccessibleName("Layered pane");
ac.setAccessibleDescription("Layered pane description");
ac = getContentPane().getAccessibleContext();
ac.setAccessibleName("Content pane");
ac.setAccessibleDescription("Content pane description");
JPanel p = new JPanel();
ac = p.getAccessibleContext();
ac.setAccessibleName("Panel");
ac.setAccessibleDescription("Panel description");
jb = new JButton("Press Me");
jb.addActionListener(this);
jb.setToolTipText("Press me for accessibility information.");
p.add(jb);
getContentPane().add(p);
setSize(200, 75);
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
dumpInfo(getAccessibleContext());
}
void dumpInfo(AccessibleContext ac) {
System.out.println("Name = " + ac.getAccessibleName());
System.out.println("Description = " + ac.getAccessibleDescription());
int nChildren = ac.getAccessibleChildrenCount();
for (int i = 0; i < nChildren; i++)
dumpInfo(ac.getAccessibleChild(i).getAccessibleContext());
}
public static void main(String[] args) {
new MainClass("Accessibility Demo1");
}
}
</source>
JFrame: getContentPane().getActionMap() [Bind key action to JFrame]
<source lang="java">
import java.awt.event.ActionEvent; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.InputMap; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.KeyStroke; public class MainClass {
public static void main(final String args[]) {
final JFrame frame = new JFrame("Frame Key");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Action actionListener = new AbstractAction() {
public void actionPerformed(ActionEvent actionEvent) {
System.out.println("Got an M");
}
};
JPanel content = (JPanel) frame.getContentPane();
KeyStroke stroke = KeyStroke.getKeyStroke("M");
InputMap inputMap = content.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
inputMap.put(stroke, "OPEN");
content.getActionMap().put("OPEN", actionListener);
frame.setSize(300, 300);
frame.setVisible(true);
}
}
</source>
JFrame: getDefaultCloseOperation()
<source lang="java">
import javax.swing.JFrame; public class Main {
public static void main(String[] argv) throws Exception {
// Create a frame
JFrame frame = new JFrame();
// Get default close operation
int op = frame.getDefaultCloseOperation(); // HIDE_ON_CLOSE
// Set to ignore the button
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
}
}
</source>
JFrame: getFontMetrics(Font font)
<source lang="java">
import java.awt.FontMetrics; import javax.swing.JFrame; public class Main {
public static void main(String args[]) {
JFrame f = new JFrame("JColorChooser Sample");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(300, 200);
f.setVisible(true);
FontMetrics metrics = f.getFontMetrics(f.getFont());
int widthX = metrics.charWidth("X");
System.out.println(widthX);
}
}
</source>
JFrame: getGlassPane()
<source lang="java">
import java.awt.*; import java.awt.event.*; import javax.swing.*; public class MainClass {
public static void main(String[] args) {
JFrame f = new JFrame();
final JPanel p1 = new JPanel();
p1.add(new JLabel("GlassPane Example"));
JButton show = new JButton("Show");
p1.add(show);
p1.add(new JButton("No-op"));
f.getContentPane().add(p1);
final JPanel glass = (JPanel)f.getGlassPane();
glass.setVisible(true);
glass.setLayout(new GridBagLayout());
JButton glassButton = new JButton("Hide");
glass.add(glassButton);
f.setSize(150, 80);
f.setVisible(true);
show.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
glass.setVisible(true);
p1.repaint();
}
});
glassButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
glass.setVisible(false);
p1.repaint();
}
});
}
}
</source>
JFrame: getLayeredPane()
<source lang="java">
import java.awt.Color; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLayeredPane; public class Main extends JFrame {
public Main() {
super("LayeredPane");
setSize(200, 150);
setDefaultCloseOperation(EXIT_ON_CLOSE);
JLayeredPane lp = getLayeredPane();
// Create 3 buttons
JButton top = new JButton();
top.setBackground(Color.white);
top.setBounds(20, 20, 50, 50);
JButton middle = new JButton();
middle.setBackground(Color.gray);
middle.setBounds(40, 40, 50, 50);
JButton bottom = new JButton();
bottom.setBackground(Color.black);
bottom.setBounds(60, 60, 50, 50);
// Place the buttons in different layers
lp.add(middle, new Integer(2));
lp.add(top, new Integer(3));
lp.add(bottom, new Integer(1));
}
public static void main(String[] args) {
Main sl = new Main();
sl.setVisible(true);
}
}
</source>
JFrame: isFocusOwner()
<source lang="java">
import javax.swing.JFrame; public class Main {
public static void main() {
JFrame f = new JFrame();
boolean b = f.isFocusOwner();
}
}
</source>
JFrame: isUndecorated()
<source lang="java">
import java.awt.Frame; public class Main {
public static void main() {
Frame frame = new Frame();
frame.setUndecorated(true);
// Get the current decorated state
boolean undecorated = frame.isUndecorated();
}
}
</source>
JFrame: processWindowEvent(WindowEvent e)
<source lang="java">
import java.awt.event.WindowEvent; import javax.swing.JFrame;
public class Main extends JFrame {
public Main(String title) {
setTitle(title);
// setDefaultCloseOperation(EXIT_ON_CLOSE);
enableEvents(java.awt.AWTEvent.WINDOW_EVENT_MASK);
}
protected void processWindowEvent(WindowEvent e) {
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
System.out.println(WindowEvent.WINDOW_CLOSING);
dispose();
System.exit(0);
}
super.processWindowEvent(e); // Pass on the event
}
public static void main(String[] a) {
Main window = new Main("Sketcher");
window.setBounds(30, 30, 300, 300);
window.setVisible(true);
}
}
</source>
JFrame: setAlwaysOnTop(boolean alwaysOnTop)
<source lang="java">
import javax.swing.JFrame; import javax.swing.JLabel; public class Main{
public static void main(String[] args) {
JFrame frame = new JFrame("Hello!!");
frame.setAlwaysOnTop(true);
frame.setLocationByPlatform(true);
frame.add(new JLabel(" Always visible"));
frame.pack();
frame.setVisible(true);
}
}
</source>
JFrame: setBackground(Color c)
<source lang="java">
import java.awt.Color; import java.awt.ruponent; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.SwingUtilities; public class Main extends JFrame {
public Main() {
this.setSize(400, 100);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLayout(new FlowLayout(FlowLayout.CENTER));
JButton button = new JButton("Change Frame Color");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Component component = (Component) e.getSource();
JFrame frame = (JFrame) SwingUtilities.getRoot(component);
frame.setBackground(Color.RED);
}
});
this.getContentPane().add(button);
}
public static void main(String[] args) {
new Main().setVisible(true);
}
}
</source>
JFrame: setCursor(Cursor c)
<source lang="java">
import java.awt.Color; import java.awt.Cursor; import java.awt.Toolkit; import javax.swing.JFrame; public class MainClass {
public static void main(String[] args) {
JFrame aWindow = new JFrame();
aWindow.setBounds(200, 200, 200, 200);
aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
aWindow.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
aWindow.getContentPane().setBackground(Color.PINK);
aWindow.setVisible(true);
}
}
</source>
JFrame: setDefaultButton(JButton bn) (Remove "Enter" key stroke from JTextField)
<source lang="java">
import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.KeyStroke; import javax.swing.text.Keymap; public class MainClass {
public static void main(final String args[]) {
JFrame frame = new JFrame("Default Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextField textField = new JTextField();
frame.add(textField, BorderLayout.NORTH);
JPanel panel = new JPanel();
JButton defaultButton = new JButton("Default Button");
defaultButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
System.out.println(actionEvent.getActionCommand() + " selected");
}
});
panel.add(defaultButton);
JButton otherButton = new JButton("Other Button");
otherButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
System.out.println(actionEvent.getActionCommand() + " selected");
}
});
panel.add(otherButton);
frame.add(panel, BorderLayout.SOUTH);
Keymap keymap = textField.getKeymap();
KeyStroke keystroke = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, false);
keymap.removeKeyStrokeBinding(keystroke);
frame.getRootPane().setDefaultButton(defaultButton);
frame.setSize(250, 150);
frame.setVisible(true);
}
}
</source>
JFrame: setDefaultButton(JButton defaultButton)
<source lang="java">
import java.awt.GridLayout; import java.awt.event.KeyEvent; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JRootPane; public class MainClass {
public static void main(String[] a) {
JFrame frame = new JFrame("DefaultButton");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridLayout(2, 2, 10, 10));
JButton button1 = new JButton("Text Button");
button1.setMnemonic(KeyEvent.VK_B);
frame.add(button1);
JButton button2 = new JButton("warn");
frame.add(button2);
JButton button3 = new JButton("Warning");
frame.add(button3);
String htmlButton = "<html>HTML Button
"
+ "Multi-line";
JButton button4 = new JButton(htmlButton);
frame.add(button4);
JRootPane rootPane = frame.getRootPane();
rootPane.setDefaultButton(button2);
frame.setSize(300, 200);
frame.setVisible(true);
}
}
</source>
JFrame: setDefaultCloseOperation(int option)
<source lang="java">
/*
* Output: * */
import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel {
public void paint(Graphics g) {
Dimension d = this.getPreferredSize();
int fontSize = 20;
g.setFont(new Font("TimesRoman", Font.PLAIN, fontSize));
g.setColor(Color.red);
g.drawString("www.jexp.ru", 10, 20);
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.getContentPane().add(new MainClass());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(200,200);
frame.setVisible(true);
}
}
</source>
JFrame: setDefaultLookAndFeelDecorated(boolean b)
<source lang="java">
import javax.swing.JFrame; public class MainClass {
public static void main(final String args[]) {
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("Adornment Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300, 100);
frame.setVisible(true);
}
}
</source>
JFrame: setExtendedState(int state)
<source lang="java">
import java.awt.Frame; public class Main {
public static void main() {
Frame frame = new Frame();
frame.setSize(300, 300);
frame.setVisible(true);
iconify(frame);
}
public static void iconify(Frame frame) {
int state = frame.getExtendedState();
// Set the iconified bit
state |= Frame.ICONIFIED;
// Iconify the frame
frame.setExtendedState(state);
}
}
</source>
JFrame: setFocusable(boolean focusable)
<source lang="java">
import javax.swing.JFrame; public class Main {
public static void main(String[] argv) throws Exception {
JFrame frame = new JFrame();
frame.setFocusable(false);
}
}
</source>
JFrame: setFocusableWindowState(boolean focusableWindowState)
<source lang="java">
import javax.swing.JFrame; public class Main {
public static void main(String[] argv) throws Exception {
JFrame frame = new JFrame();
frame.setFocusableWindowState(false);
}
}
</source>
JFrame: setFocusTraversalPolicy(FocusTraversalPolicy lo)
<source lang="java">
import java.awt.ruponent; import java.awt.Container; import java.awt.FocusTraversalPolicy; import java.awt.GridLayout; import java.util.Arrays; import java.util.ruparator; import java.util.List; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.SortingFocusTraversalPolicy; public class MainClass {
public static void main(String args[]) {
JFrame frame = new JFrame("Reverse Sample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridLayout(3, 3));
for (int i = 9; i > 0; i--) {
JButton button = new JButton(Integer.toString(i));
frame.add(button, 0);
}
final Container contentPane = frame.getContentPane();
Comparator<Component> comp = new Comparator<Component>() {
public int compare(Component c1, Component c2) {
Component comps[] = contentPane.getComponents();
List list = Arrays.asList(comps);
int first = list.indexOf(c1);
int second = list.indexOf(c2);
return second - first;
}
};
FocusTraversalPolicy policy = new SortingFocusTraversalPolicy(comp);
frame.setFocusTraversalPolicy(policy);
frame.setSize(300, 200);
frame.setVisible(true);
}
}
</source>
JFrame: setIconImage(Image image)
<source lang="java">
import java.awt.Image; import java.awt.Toolkit; import javax.swing.JFrame; /*
*/
public class MainClass {
public static void main(String[] unused) {
JFrame f = new JFrame("FrameIcon");
Image im = Toolkit.getDefaultToolkit().getImage("FrameIcon.gif");
f.setIconImage(im);
f.setSize(100, 100);
f.setLocation(200, 200);
f.setVisible(true);
}
}
</source>
JFrame: setJMenuBar(JMenuBar bar)
<source lang="java">
import java.awt.event.KeyEvent; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JRadioButtonMenuItem; public class MainClass {
public static void main(String args[]) {
JFrame f = new JFrame("JRadioButtonMenuItem Sample");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuBar bar = new JMenuBar();
JMenu menu = new JMenu("Options");
menu.setMnemonic(KeyEvent.VK_O);
ButtonGroup group = new ButtonGroup();
JRadioButtonMenuItem menuItem = new JRadioButtonMenuItem("A");
group.add(menuItem);
menu.add(menuItem);
menuItem = new JRadioButtonMenuItem("B");
group.add(menuItem);
menu.add(menuItem);
menuItem = new JRadioButtonMenuItem("C");
group.add(menuItem);
menu.add(menuItem);
bar.add(menu);
f.setJMenuBar(bar);
f.setSize(300, 200);
f.setVisible(true);
}
}
</source>
JFrame: setLocationByPlatform(boolean locationByPlatform)
<source lang="java">
import javax.swing.JFrame; import javax.swing.JLabel; public class Main{
public static void main(String[] args) {
JFrame frame = new JFrame("Hello!!");
frame.setAlwaysOnTop(true);
frame.setLocationByPlatform(true);
frame.add(new JLabel(" Always visible"));
frame.pack();
frame.setVisible(true);
}
}
</source>
JFrame: setLocation(int x, int y)
<source lang="java">
import java.awt.Dimension; import java.awt.Toolkit; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; public class Main extends JFrame {
public Main() {
setTitle("CenteredFrame");
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension screenSize = tk.getScreenSize();
int screenHeight = screenSize.height;
int screenWidth = screenSize.width;
setSize(screenWidth / 2, screenHeight / 2);
setLocation(screenWidth / 4, screenHeight / 4);
}
public static void main(String[] args) {
JFrame frame = new Main();
frame.setVisible(true);
}
}
</source>
JFrame: setLocationRelativeTo(Component c)
<source lang="java">
import java.awt.Dimension; import javax.swing.JFrame; import javax.swing.JSlider; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; public class Main {
public static void main(String[] args) {
JFrame f = new JFrame();
final JSlider slider = new JSlider(0, 150, 0);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
slider.setPreferredSize(new Dimension(150, 30));
slider.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent event) {
int value = slider.getValue();
if (value == 0) {
System.out.println("0");
} else if (value > 0 && value <= 30) {
System.out.println("value > 0 && value <= 30");
} else if (value > 30 && value < 80) {
System.out.println("value > 30 && value < 80");
} else {
System.out.println("max");
}
}
});
f.add(slider);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
</source>
JFrame: setMaximizedBounds(Rectangle bounds)
<source lang="java">
import java.awt.Frame; import java.awt.Rectangle; public class Main {
public static void main() {
Frame frame = new Frame();
Rectangle bounds = new Rectangle(20, 20, 200, 200);
frame.setMaximizedBounds(bounds);
frame.setVisible(true);
}
}
</source>
JFrame: setSize(int width, int height)
<source lang="java">
/*
* Output: * */
import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel {
public void paint(Graphics g) {
Dimension d = this.getPreferredSize();
int fontSize = 20;
g.setFont(new Font("TimesRoman", Font.PLAIN, fontSize));
g.setColor(Color.red);
g.drawString("www.jexp.ru", 10, 20);
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.getContentPane().add(new MainClass());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(200,200);
frame.setVisible(true);
}
}
</source>
JFrame: setTitle(String title)
<source lang="java">
import javax.swing.JFrame; public class Main extends JFrame {
public static void main(String[] args) {
new Main();
}
public Main() {
this.setSize(200, 100);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setTitle("Hello World!");
this.setVisible(true);
}
}
</source>
JFrame: setUndecorated(boolean b)
<source lang="java">
import javax.swing.JFrame; import javax.swing.JRootPane; public class MainClass {
public static void main(final String args[]) {
JFrame frame = new JFrame("Adornment Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setUndecorated(true);
frame.getRootPane().setWindowDecorationStyle(JRootPane.FRAME);
frame.setSize(300, 100);
frame.setVisible(true);
}
}
</source>
JFrame: setVisible(boolean visible)
<source lang="java">
/*
* Output: * */
import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel {
public void paint(Graphics g) {
Dimension d = this.getPreferredSize();
int fontSize = 20;
g.setFont(new Font("TimesRoman", Font.PLAIN, fontSize));
g.setColor(Color.red);
g.drawString("www.jexp.ru", 10, 20);
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.getContentPane().add(new MainClass());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(200,200);
frame.setVisible(true);
}
}
</source>
