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Creating A Dynamic User Interface in Java


 

Almost all new java programmers want to know that how to create dynamic interfaces in java language. Creating GUI (graphical user interface) is not going to be very easy and something not easy for new programmers. However interface builder can provide you a time and money saving solution to build a dynamic user interface in java. You can use interface builder for creating your company’s first java language application. Super Java App Builder is mostly for this purpose and you should know that it has some basis limitations and design specifications need windows to be populated with various widgets. Number, type and widgets placement should be changed dynamically.

In this article you will find read how to create user interface in java which changes dynamically with code example. It needs some manual work, how it is easy to create in java language by making use of Abstract Window Toolkit(AWT).

 

Need of Hand-Code User Interface:

 

There are some conditions where interface builders are not helpful and among them one situation is dynamic user interface building in java language. Making user interface application which changes automatically depending upon current application state. In more details it is that window which needs to add and remove application components replying to user actions. Window can act just like a control panel containing more that one mode with one option selected and it displays some set of controls for switching. Window which shows more or fewer user interfaces depending on the user’s selection like operating system has “find file” window and when user click on this button it expands as it finds more items adding new item to the bottom of the window.

 


You can download demo applications created in java for review from internet. Many programmers have placed java demo applications for free reviews. Download them and run then using this command Java application-name However demo applications are not totally useful and contains source code of the basis part of the application and if you are already expert in java programming then you may find solution behind that. Here this example contains code which is used by many layout managers from Abstract Window Toolkit. Follow Layout manager is completely used for the panel which application displays. It lays application components from left to right and wrapped them around as required same like many word processors do.

  panelTopLevel = new Panel();

  panelTopLevel.setLayout(new BorderLayout(5,5));

BorderLayout components are used for setting positions towards different angles like North,West,East and South.

Add(panelTopLevel);

 With BorderLayout, you specify components’ positions as North, West, East, South, and Center. This top-level panel is placed in the application’s main panel: add(panelTopLevel);Choice component could be placed in new panel which is located at north top panel.panelDynamic will use GridLayout manager and its code ispanelDynamic.setLayout(new GridLayout(3,2));panel.Dynamic.setLayout(new GridLayout(3,2)0;Method makeMiscControls() routine is used to create makeButtonGrid and it displays different components which appears while selecting “Control Panel”.

 Receiving Events

 addItemListener() method is used for receive events while new users make choices.Choices.addItemListerner(this);addItemListener method is used as part of ItemSelectable interface and by using this method program classes of Applet shows components which applets wants to receive while making new selections and events are received using this methoditemStateChanged() callback.Same like this addActionListerner() receives events whenever users clicks on Add and remove buttons.

buttonAdd.addActionListener(this); … button. Remove.addActionListener(this);

actionPerformed() callback routine will be called whenever either of these buttons are clicked and each routine checks the current size of buttons and adds removes buttons if necessary.


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