SWING - JFrame Class
Introduction
The class JFrame is an extended version of java.awt.Frame that adds support for the JFC/Swing component architecture.
Class declaration
Following is the declaration for javax.swing.JFrame class:
public class JFrame extends Frame implements WindowConstants, Accessible, RootPaneContainer
Field
Following are the fields for java.awt.Component class:
protected AccessibleContext accessibleContext --The accessible context property.
static int EXIT_ON_CLOSE -- The exit application default window close operation.
protected JRootPane rootPane -- The JRootPane instance that manages the contentPane and optional menuBar for this frame, as well as the glassPane.
protected boolean rootPaneCheckingEnabled -- If true then calls to add and setLayout will be forwarded to the contentPane.
Class constructors
S.N. | Constructor & Description |
---|---|
1 | JFrame() Constructs a new frame that is initially invisible. |
2 | JFrame(GraphicsConfiguration gc) Creates a Frame in the specified GraphicsConfiguration of a screen device and a blank title. |
3 | JFrame(String title) Creates a new, initially invisible Frame with the specified title. |
4 | JFrame(String title, GraphicsConfiguration gc) Creates a JFrame with the specified title and the specified GraphicsConfiguration of a screen device. |
Class methods
S.N. | Method & Description |
---|---|
1 | protected void addImpl(Component comp, Object constraints, int index) Adds the specified child Component. |
2 | protected JRootPane createRootPane() Called by the constructor methods to create the default rootPane. |
3 | protected void frameInit() Called by the constructors to init the JFrame properly. |
4 | AccessibleContext getAccessibleContext() Gets the AccessibleContext associated with this JFrame. |
5 | Container getContentPane() Returns the contentPane object for this frame. |
6 | int getDefaultCloseOperation() Returns the operation that occurs when the user initiates a "close" on this frame. |
7 | Component getGlassPane() Returns the glassPane object for this frame. |
8 | Graphics getGraphics() Creates a graphics context for this component. |
9 | JMenuBar getJMenuBar() Returns the menubar set on this frame. |
10 | JLayeredPane getLayeredPane() Returns the layeredPane object for this frame. |
11 | JRootPane getRootPane() Returns the rootPane object for this frame. |
12 | TransferHandler getTransferHandler() Gets the transferHandler property. |
13 | static boolean isDefaultLookAndFeelDecorated() Returns true if newly created JFrames should have their Window decorations provided by the current look and feel. |
14 | protected boolean isRootPaneCheckingEnabled() Returns whether calls to add and setLayout are forwarded to the contentPane. |
15 | protected String paramString() Returns a string representation of this JFrame. |
16 | protected void processWindowEvent(WindowEvent e) Processes window events occurring on this component. |
17 | void remove(Component comp) Removes the specified component from the container. |
18 | void repaint(long time, int x, int y, int width, int height) Repaints the specified rectangle of this component within time milliseconds. |
19 | void setContentPane(Container contentPane) Sets the contentPane property. |
20 | void setDefaultCloseOperation(int operation) Sets the operation that will happen by default when the user initiates a "close" on this frame. |
21 | static void setDefaultLookAndFeelDecorated(boolean defaultLookAndFeelDecorated) Provides a hint as to whether or not newly created JFrames should have their Window decorations (such as borders, widgets to close the window, title...) provided by the current look and feel. |
22 | void setGlassPane(Component glassPane) Sets the glassPane property. |
23 | void setIconImage(Image image) Sets the image to be displayed as the icon for this window. |
24 | void setJMenuBar(JMenuBar menubar) Sets the menubar for this frame. |
25 | void setLayeredPane(JLayeredPane layeredPane) Sets the layeredPane property. |
26 | void setLayout(LayoutManager manager) Sets the LayoutManager. |
27 | protected void setRootPane(JRootPane root) Sets the rootPane property. |
28 | protected void setRootPaneCheckingEnabled(boolean enabled) Sets whether calls to add and setLayout are forwarded to the contentPane. |
29 | void setTransferHandler(TransferHandler newHandler) Sets the transferHandler property, which is a mechanism to support transfer of data into this component. |
30 | void update(Graphics g) Just calls paint(g). |
Methods inherited
This class inherits methods from the following classes:
java.awt.Frame
java.awt.Window
java.awt.Container
java.awt.Component
java.lang.Object
JFrame Example
Create the following java program using any editor of your choice in say D:/ > SWING > com > tutorialspoint > gui >
SwingContainerDemo.javapackage com.tutorialspoint.gui; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingContainerDemo { private JFrame mainFrame; private JLabel headerLabel; private JLabel statusLabel; private JPanel controlPanel; private JLabel msglabel; public SwingContainerDemo(){ prepareGUI(); } public static void main(String[] args){ SwingContainerDemo swingContainerDemo = new SwingContainerDemo(); swingContainerDemo.showJFrameDemo(); } private void prepareGUI(){ mainFrame = new JFrame("Java Swing Examples"); mainFrame.setSize(400,400); mainFrame.setLayout(new GridLayout(3, 1)); mainFrame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent windowEvent){ System.exit(0); } }); headerLabel = new JLabel("", JLabel.CENTER); statusLabel = new JLabel("",JLabel.CENTER); statusLabel.setSize(350,100); msglabel = new JLabel("Welcome to TutorialsPoint SWING Tutorial.", JLabel.CENTER); controlPanel = new JPanel(); controlPanel.setLayout(new FlowLayout()); mainFrame.add(headerLabel); mainFrame.add(controlPanel); mainFrame.add(statusLabel); mainFrame.setVisible(true); } private void showJFrameDemo(){ headerLabel.setText("Container in action: JFrame"); final JFrame frame = new JFrame(); frame.setSize(300, 300); frame.setLayout(new FlowLayout()); frame.add(msglabel); frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent windowEvent){ frame.dispose(); } }); JButton okButton = new JButton("Open a Frame"); okButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { statusLabel.setText("A Frame shown to the user."); frame.setVisible(true); } }); controlPanel.add(okButton); mainFrame.setVisible(true); } }
Compile the program using command prompt. Go to D:/ > SWING and type the following command.
D:\SWING>javac com\tutorialspoint\gui\SwingContainerDemo.java
If no error comes that means compilation is successful. Run the program using following command.
D:\SWING>java com.tutorialspoint.gui.SwingContainerDemo
Verify the following output
![SWING JFrame](/swing/images/swing_jframe.jpg)