JAVA Swing

Prepared by

Miss. Arati A. Gadgil

Difference between AWT and Swing

AWT Swing

platform-dependent. platform-independent heavyweight. lightweight.

doesn't support pluggable look supports pluggable look and feel. and feel.

provides less components than provides more powerful Swing. components such as

tables, lists, scrollpanes, colorchooser,tabbedpane.

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Methods

public void add(Component c)

public void setSize(int width,int height)

public void setLayout(LayoutManager m)

public void setVisible(boolean b)

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JButton class

Constructors:JButton()JButton(String s)JButton(Icon i)

Methods1) public void setText(String s)2) public String getText()3) public void setEnabled(boolean b)4) public void setIcon(Icon b)5) public Icon getIcon()6) public void setMnemonic(int a)7) public void addActionListener(ActionListener a)

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JRadioButton class

ConstructorsJRadioButton()JRadioButton(String s)JRadioButton(String s, boolean selected)

Methods1) public void setText(String s)2) public String getText()3) public void setEnabled(boolean b) 4) public void setIcon(Icon b)5) public Icon getIcon() 6) public void setMnemonic(int a)7) public void addActionListener(ActionListener a)

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JTextArea class

ConstructorsJTextArea():JTextArea(String s)JTextArea(int row, int column)JTextArea(String s, int row, int column)

Methods1) public void setRows(int rows)2) public void setColumns(int cols)3) public void setFont(Font f)4) public void insert(String s, int position)5) public void append(String s)

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JTable class

Constructors

JTable()

JTable(Object[][] rows, Object[] columns)

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Graphics classMethodspublic abstract void drawString(String str, int x, int y)

is used to draw the specified string.

public void drawRect(int x, int y, int width, int height)draws a rectangle with the specified width and height.

public abstract void fillRect(int x, int y, int width, int height)is used to fill rectangle with the default color and specified width and height.

public abstract void drawOval(int x, int y, int width, int height)is used to draw oval with the specified width and height.

public abstract void setFont(Font font) is used to set the graphics current font to the specified font

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Methodspublic abstract void fillOval(int x, int y, int width, int height)is used to fill oval with the default color and specified width and height.

public abstract void drawLine(int x1, int y1, int x2, int y2)is used to draw line between the points(x1, y1) and (x2, y2).

public abstract void drawArc(int x, int y, int width, int height, int startAngle, int arcAngle)is used draw a circular or elliptical arc.

public abstract void fillArc(int x, int y, int width, int height, int startAngle, int arcAngle)is used to fill a circular or elliptical arc.

public abstract void setColor(Color c)is used to set the graphics current color to the specified color. 9

Methods

The following three methods are involved in displaying graphics. Default versions of each are provided by class Component. Methods update() and paint() should be redefined to perform the desired graphics operations.

repaint() The repaint() method requests that a component be repainted.

public void repaint() public void repaint(long tm) public void repaint(int x, int y, int w, int h) public void repaint(long tm, int x, int y, int w, int h)

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update()

public void update(Graphics g)

The update() method is called in response to a repaint() request, or in response to a portion of the component being uncovered or displayed for the first time.

paint()

public void paint(Graphics g)

The paint() method is called from an update() method, and is responsible for actually drawing the graphics.

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JComboBox classConstructorsJComboBox()JComboBox(Object[] items)

methods 1)public void addItem(Object anObject): is used to add an item to the item list.2) public void removeItem(Object anObject) is used to delete an item to the item list.3) public void removeAllItems() is used to remove all the items from the list.4) public void setEditable(boolean b) is used to determine whether the JComboBox is editable.5) public void addActionListener(ActionListener a) is used to add the ActionListener.6) public void addItemListener(ItemListener i) is used to add the ItemListener.

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JColorChooser classConstructors

JColorChooser()is used to create a color chooser pane with white color initially.

JColorChooser(Color initialColor) is used to create a color chooser pane with the specified color initially.

Method

public static Color showDialog(Component c, String title, Color initialColor) is used to show the color-chooser dialog box.

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JProgressBar classConstructors

JProgressBar()is used to create a horizontal progress bar but no string text.

JProgressBar(int min, int max)is used to create a horizontal progress bar with the specified minimum and maximum value.

JProgressBar(int orient)is used to create a progress bar with the specified orientation, it can be either Vertical or Horizontal by using SwingConstants.VERTICAL and SwingConstants.HORIZONTAL constants.

JProgressBar(int orient, int min, int max)is used to create a progress bar with the specified orientation, minimum and maximum value 14

Methods

1)public void setStringPainted(boolean b): is used to determine whether string should be displayed.

2) public void setString(String s) is used to set value to the progress string.

3) public void setOrientation(int orientation) is used to set the orientation, it may be either vertical or horizontal by using SwingConstants. VERTICAL and SwingConstants.HORIZONTAL constants..

4) public void setValue(int value)  is used to set the current value on the progress bar

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JSlider classConstructorsJSlider()creates a slider with the initial value of 50 and range of 0 to 100.

JSlider(int orientation)creates a slider with the specified orientation set by either JSlider.HORIZONTAL or JSlider.VERTICAL with the range 0 to 100 and initial value 50.

JSlider(int min, int max)creates a horizontal slider using the given min and max.

JSlider(int min, int max, int value): creates a horizontal slider using the given min, max and value.

JSlider(int orientation, int min, int max, int value): creates a slider using the given orientation, min, max and value 16

Methods

1)public void setMinorTickSpacing(int n): is used to set the minor tick spacing to the slider.

2) public void setMajorTickSpacing(int n) is used to set the major tick spacing to the slider.

3) public void setPaintTicks(boolean b) is used to determine whether tick marks are painted

4) public void setPaintLabels(boolean b) is used to determine whether labels are painted.

5) public void setPaintTracks(boolean b) is used to determine whether track is painted.

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The Model-View-Controller Design Pattern

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Roots in MVC Swing architecture is rooted in the model-view-controller ( MVC) design that dates back to SmallTalk. MVC architecture calls for a visual application to be broken up into three separate parts:

• A model that represents the data for the application.

• The view that is the visual representation of that data.

• A controller that takes user input on the view and translates that to changes in the model.

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Menus

A menu provides a space-saving way to let the user choose one of several options. Other components with which the user can make a one-of-many choice include combo boxes, lists, radio buttons, spinners, and tool bars.

Creating menu bars

To create a menu bar:

add a JMenuBar to a JFrame

add JMenus to the JMenuBar and

add JMenuItems to the JMenus

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Pluggable Look and Feel

The Swing toolkit allows you to decide how to configure the particular look and feel of your application. If you don't specify a look and feel, the Swing UI manager figures out which one to use.

Leave it up to the Swing UI manager. If a particular look and feel is not specified by the program, Swing's UI manager checks whether the user has specified a preference. If that preference hasn't been specified or isn't available, the default look and feel is used.

The default look and feel is determined by the supplier of the JRE. For the JRE that Sun provides, the Java look and feel (called Metal) is used. The Java look and feel works on all platforms.

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Use the look and feel of the native platform. If the application is running on a Microsoft Windows XP machine, the Windows look and feel is used. On Mac OS platforms, the Aqua look and feel is used. On UNIX platforms, such as Solaris or Linux, either the GTK+ look and feel or the CDE/Motif look and feel is used, depending on the user's desktop choice.

Specify a particular look and feel. Swing ships with four look and feels: Java (also called Metal), Microsoft Windows, GTK+, and CDE/Motif. The GTK+ look and feel requires a theme, and there are many available for free on the Internet.

Create your own look and feel using the Synth package.

Use an externally provided look and feel.

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Thank You

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