Free Java Advanced Theory Notes For Beginners1

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Component and containers

Component and containers Component A component is an independent visual control, such as a push button or slider. A component is an object with a graphical representation that can be displayed on the screen and interact with the user. Examples of components include buttons, checkboxes, and scrollbars commonly found in graphical user interfaces. Swing components inherit from the javax.Swing.JComponent class, which is the root of the swing component hierarchy. Swing components are derived from the JComponent class. JComponent provides the functionality that is common to all components. For example, JComponent supports the pluggable look and feel. JComponent inherits the AWT classes Container and component. Thus, a swing component is built on and compatible with an AWT component. All of the swing's components are represented by classes defined within the package javax.swing. The following table shows the class names for swing components JApplet JColorChooser JDialo...

Model View Controller-Hierarchy of Swing Classes

Model view controller(MVC) The Hierarchy of Swing Classes Model view controller(MVC) Swing mainly follows the Model view controller( MVC ) architecture. Using the Model view controller, we can make changes in one component without impacting or touching other components. It is also known as loosely coupled architecture. The Model-View-Controller is a well-known software architectural pattern ideal for implementing user interfaces on computers by dividing an application into three interconnected parts. Swing uses the Model-View-Controller Architecture( MVC ) as the fundamental design behind each of its components. Essentially, MVC breaks GUI components into three elements. Each of these elements plays a crucial role in how the component behaves. The main goal of MVC is to separate internal representations of an application from the ways information is presented to the user. Initially, MVC was designed for desktop GUI applications but it’s quickly become an ...

The swing packages in java

Sixteen java swing packages and its brief description Delicious plum cake recipe -Malayalam Java swing packages Java swing packages is used to create window-based applications. There are totally sixteen packages in the swing package,a brief description of which is given below: Javax.swing—> Provides a set of lightweight components to the maximum degree possible, work the same on all platforms. Javax.swing.border—> Provides classes and interface for drawing specialized borders around the swing component. javax.swing.colorchooser—> Contains classes and interface used by Jcolorchooser component. Javax.swing.event—> Provides for events fired by swing components. Javax.swing.filechooser—> Contains classes and interface used by Jfilechooser component. Javax.swing.plaf—> Provides one interface and many abstract classes that swing uses to provide its pluggable look and feel capabilities. Javax.swing.plaf.basic—> Provides user interface objects built according to the b...

Introduction to Java Swings`

Java swing short explanation-Difference between AWT and Swing Java Swing Java swing is a part of Java Foundation Classes( JFC ) and is used to create various applications. Swing is an API for providing a graphical user interface ( GUI ) for Java programs. It offers much-improved functionality over AWT .Swing components requires javax.swing package. What is JFC? JFC is the set of GUI components that simplify desktop Applications. Features Of Swing Class Pluggable look and feel. Uses MVC architecture. Lightweight Components. Platform Independent. Swing controls can be customized in a very easy way as visual appearance is independent of internal representation. Swing provides a rich set of advanced controls like Tree TabbedPane, slider, colorpicker, and table controls. Acronyms to remember in Java programming: GUI stands for G raphical U ser I nterface API stands for A pplication P rogram I nterface AWT stands for A bstract W indow T oolkit MVC stands ...

Java AWT Controls-part 4

Java simple theory notes for AWT controls part4 Easy and tasty Christmas cake recipes TextField Control TextField control holds a single line of text that can be edited.Hence, this control is called editable control. The TextField control is a Sub-Class of the TextComponent class.It can be created using the following constructors: TextField test1=new TextField() ; TextField test2=new TextField(int); TextField test3=new TextField(String); TextField test4=new TextField(String,int); Here test1,test2,test3 and test4 are the object name, the programmer can give the desired name as the object name. The first and third constructors create the default TextField . The Second and fourth creates a TextField of size specified by the number of characters. The text field control has the methods getText() and set Text(String) for getting and setting the values in the text field. The text field can be made editable or non-editable by using the following methods: SetEditable...

AWT control fundamentals in java-part 3

AWT components in java Choice control The choice control contains a list of choices from which one can be selected. When it is inactive it takes the same Space as that of a single choice. Choice has only one default constructor, namely: Choice choice1 = new Choice(); Here choice1 is the object name, the programmer can give the desired name as the object name. To add items to the choice created in the above statement, The following method can be used. choice1.addltem(String); choice1.add(String); To get the selected item, the method getSelected Item() is used and the index of the Selected item can be obtained using the method get selectedindex(). Items can also be selected using Select( int index) and Select (String name) when either the index or the name of the item is Known. List control. The list control is similar to the choice control, but multiple items can be selected using the list control.Here the number rows to be visible in the list can be specified, Whereas in the choic...

AWT controls in Java-part 2

Java simple theory notes for AWT controls part2 java AWT CheckBox A check box is a graphical component that can be in either an "on" (true) or "off" (false) state. Clicking on a check box changes its state from "on" to "off," or from "off" to "on." In other words, the checkbox control is used to select or deselect different options.These control also have a label associated with them which describe the option of the checkbox. How to create a label? syntax for creating labels: Checkbox cbox1=new Checkbox(); Checkbox cbox2=new Checkbox(String); Checkbox cbox3=new Checkbox(String,boolean); Here cbox1,cbox2,cbox3 are the object name, the programmer can give the desired name as the object name. Given above are three types of constructor for the checkbox The first one creates a blank default checkbox.The label for checkbox can be set using the setLabel() method The second constructor creates a checkbox with the specified labe...