CHAPTER:08 JAVA IDE PROGRAMMING-III Prepared By Prepared By :
VINAY ALEXANDER ( ) PGT(CS),KV JHAGRAKHAND Slide 2 Objective In
this presentation you will learn about the following swing controls
i.e. Purpose, their design time Properties and Run time Methods.
List (jList) Combo (List+Text Field) (jComboBox) Timers Random
Number Generation & use Slide 3 Working with jList control A
List (or List box) is box shaped control containing list of
objects, from which single or multiple selection can be made. jList
control offers the following features- A box shaped control capable
to displaying a list of choices (Text or graphics/images). It
Allows single or multiple selection of items using mouse. Equipped
with built-in scroll bar to view a large list. valueChanged()
method of ListSelection Listener is used to handle the JList events
Slide 4 How to add jList control with Frame A jList can be attached
with frame in following way- Select List control from Swing
palette, and drag and drop on the frame. Select the jList control
and click on() button of Model property. A dialog box appears. Type
list of choices in ListModelEditor dialog box. Finally press OK
button. List Box is displayed on the frame with typed choices.
Slide 5 Slide 6 int [ ] getSelectedIndices( ) Returns an array of
all of the selected indices, in increasing order, or an empty if
nothing is selected Slide 7 Slide 8 Slide 9 Slide 10
Adding/Removing Items at run time (Dynamic List) Step 1. Add a list
control to your form. Step 2. Define its through DefaultListModel
Step3:The following steps should be followed in the event handler
of the button, where you want to implement the command. 1. Make a
model object as- DefaultListModel dlm = (DefaultListModel)
jList1.getModel(); Slide 11 2. Use following command as per
requirement- // add item in the end of the list//
dlm.addElement(Apple); // Insert item at given index in the list//
dlm.addElementAt(Apple,2); // Remove selected item from the list//
dlm.removeElement(jList1.getSelectedIndex()); // Remove item from
given position from the list// dlm.removeElementAt(4); // Remove
given item from from the list// dlm.removeElement(Banana); 3.
Reflect all changes to the list jList1.setModel(dlm) Slide 12 Slide
13 Slide 14 Slide 15 Slide 16 Slide 17 Slide 18 Table: It is
responsible for displaying or representing the data in tabular way
i.e, in row and column format using JTable. But the data to a
Jtable is provided via a Table Model. A Table Model is responsible
for storing data that will act as source for Jtable. Slide 19 Steps
for Adding a row in a table: 1.Create a table in netbeans. if a
table stores details like empno, empname, desig, basic. 2. create
an object array out of the data for the new row by specifying data
in the same order as determined in step 1 object
newRow[]={1105,ram, head,108000}; Or object[ ] newRow={
emn.getText, emname.getText(), emdesig. getText(), emsal. getText()
}; Slide 20 3. Obtain the tables model in a DefaultTableModel
object. Syntax: DefaultTableModel =(DefaultTableModel). getMode();
Example: DefaultTableModel tm=(DefaultTableModel) emptbl.
getMode(); Import javax.swing.table.*; // top of source editor 4.
Now add the object array created in step 2 into the table-model
object of step 3 using addRow( ) method. Syntax:.addRow ( ; OR
tm.addRow(newRow); // add a row in a table tm.removeRow(2); //
remove row 3 from table Slide 21 Commonly used methods of Jtable
class Ml getModelethodDescription int getColumnCount( )Return the
number of column in the table int getRowCount ( )Return the number
of row in the table TableMode getModel( )Return the TableModel that
provides the data displayed by this JTable Object getValueAt(int
row,int column)Return the cell value at row and column Slide 22
MENU BASIC => Horizontal menu known as Menu bar. It contains one
or more menus and has a customary,platform-dependent location.
=> Vertical Menu known as popup menu/pull-down/ sub menu. It is
invisible until the user performs more mouse action. => A
Toolbar is a collection of buttons that correspond to items in an
applications menu, providing a graphic interface for the user to
access an applications most frequently used functions and commands.
Slide 23
