online auction
PRACTICAL: 1
Aim : Write a program to implement Calculator using java applet.
Tools : NetBeans IDE 7.0.1,JDK
Theory:- Pluggable look and feel is a mechanism used in the Java Swing widget toolkit allowing to change the look and feel of the graphical user interface at runtime.
Swing allows an application to specialize the look and feel of widgets by modifying the default (via runtime parameters), deriving from an existing one, by creating one from scratch.
The javax.swing.plaf package consists of abstract classes derived from ComponentUI, and the classes in the javax.swing.plaf.basic package extend these abstract classes to implement the Basic look-and-feel. This is the set of UI delegates that all other look-and-feel classes are expected to use as a base for building off of. The Basic look-and-feel cannot be used on its own because BasicLookAndFeel is an abstract class. There are three pluggable look-and-feel implementations derived from the Basic look-and-feel:
Windows: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
CDE\Motif: com.sun.java.swing.plaf.motif.MotifLookAndFeel
Metal (default): javax.swing.plaf.metal.MetalLookAndFeel
Each look-and-feel package contains a class derived from the abstract class javax.swing.LookAndFeel: BasicLookAndFeel, MetalLookAndFeel, WindowsLookAndFeel, etc. These are the central points of access to each look-and-feel package. You use them when changing the current look-and-feel, and the UIManager class (which is used to manage installed look-and-feels) uses them to access the current look-and-feel's UIDefaults table (which contains, among other things, UI delegate class names for each Swing component's corresponding look-and-feel).
SwingUtilities.updateComponentTreeUI() informs all children of the specified component that the look-and-feel has changed and that they need to discard their UI delegate in exchange for a different one of the specified type.
Program : package cal1;
import java.awt.*;
import
Aim : Write a program to implement Calculator using java applet.
Tools : NetBeans IDE 7.0.1,JDK
Theory:- Pluggable look and feel is a mechanism used in the Java Swing widget toolkit allowing to change the look and feel of the graphical user interface at runtime.
Swing allows an application to specialize the look and feel of widgets by modifying the default (via runtime parameters), deriving from an existing one, by creating one from scratch.
The javax.swing.plaf package consists of abstract classes derived from ComponentUI, and the classes in the javax.swing.plaf.basic package extend these abstract classes to implement the Basic look-and-feel. This is the set of UI delegates that all other look-and-feel classes are expected to use as a base for building off of. The Basic look-and-feel cannot be used on its own because BasicLookAndFeel is an abstract class. There are three pluggable look-and-feel implementations derived from the Basic look-and-feel:
Windows: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
CDE\Motif: com.sun.java.swing.plaf.motif.MotifLookAndFeel
Metal (default): javax.swing.plaf.metal.MetalLookAndFeel
Each look-and-feel package contains a class derived from the abstract class javax.swing.LookAndFeel: BasicLookAndFeel, MetalLookAndFeel, WindowsLookAndFeel, etc. These are the central points of access to each look-and-feel package. You use them when changing the current look-and-feel, and the UIManager class (which is used to manage installed look-and-feels) uses them to access the current look-and-feel's UIDefaults table (which contains, among other things, UI delegate class names for each Swing component's corresponding look-and-feel).
SwingUtilities.updateComponentTreeUI() informs all children of the specified component that the look-and-feel has changed and that they need to discard their UI delegate in exchange for a different one of the specified type.
Program : package cal1;
import java.awt.*;
import