java barcode api Handling Choice Lists in Java

Encoder Denso QR Bar Code in Java Handling Choice Lists

Handling Choice Lists
Making QR Code JIS X 0510 In Java
Using Barcode creation for Java Control to generate, create Quick Response Code image in Java applications.
QR Code ISO/IEC18004 Reader In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Each time a choice is selected, an item event is generated This is sent to any listeners that previously registered an interest in receiving item event notifications from that component Each listener implements the ItemListener interface That interface defines the itemStateChanged( ) method An ItemEvent object is supplied as the argument to this method Here is an example that creates two Choice menus One selects the operating system The other selects the browser
Barcode Drawer In Java
Using Barcode drawer for Java Control to generate, create bar code image in Java applications.
Scanning Barcode In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
// Demonstrate Choice lists import javaawt*; import javaawtevent*;
Printing QR-Code In Visual C#
Using Barcode maker for VS .NET Control to generate, create QR Code image in Visual Studio .NET applications.
Create QR Code In VS .NET
Using Barcode generator for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.
Part II:
Print QR Code In VS .NET
Using Barcode creator for .NET framework Control to generate, create QR Code JIS X 0510 image in VS .NET applications.
QR-Code Drawer In Visual Basic .NET
Using Barcode generator for Visual Studio .NET Control to generate, create Denso QR Bar Code image in .NET framework applications.
The Java Library
European Article Number 13 Generation In Java
Using Barcode creation for Java Control to generate, create UPC - 13 image in Java applications.
Matrix Barcode Generator In Java
Using Barcode encoder for Java Control to generate, create Matrix 2D Barcode image in Java applications.
import javaapplet*; /* <applet code="ChoiceDemo" width=300 height=180> </applet> */ public class ChoiceDemo extends Applet implements ItemListener { Choice os, browser; String msg = ""; public void init() { os = new Choice(); browser = new Choice(); // add items to os list osadd("Windows XP"); osadd("Windows Vista"); osadd("Solaris"); osadd("Mac OS"); // add items to browser list browseradd("Internet Explorer"); browseradd("Firefox"); browseradd("Opera"); // add choice lists to window add(os); add(browser); // register to receive item events osaddItemListener(this); browseraddItemListener(this); } public void itemStateChanged(ItemEvent ie) { repaint(); } // Display current selections public void paint(Graphics g) { msg = "Current OS: "; msg += osgetSelectedItem(); gdrawString(msg, 6, 120); msg = "Current Browser: "; msg += browsergetSelectedItem(); gdrawString(msg, 6, 140); } }
Linear Creation In Java
Using Barcode creation for Java Control to generate, create Linear 1D Barcode image in Java applications.
GS1 DataBar Truncated Drawer In Java
Using Barcode generation for Java Control to generate, create GS1 DataBar Expanded image in Java applications.
Sample output is shown in Figure 24-4
ISSN - 10 Generation In Java
Using Barcode drawer for Java Control to generate, create ISSN - 13 image in Java applications.
Bar Code Recognizer In VS .NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
24:
Drawing GTIN - 12 In None
Using Barcode encoder for Office Word Control to generate, create UPC-A Supplement 5 image in Microsoft Word applications.
Creating Barcode In VS .NET
Using Barcode generation for VS .NET Control to generate, create barcode image in .NET framework applications.
Using AWT Controls, Layout Managers, and Menus
Printing GS1 128 In C#
Using Barcode drawer for .NET framework Control to generate, create EAN128 image in VS .NET applications.
Code 128 Code Set B Creator In Visual C#
Using Barcode generator for VS .NET Control to generate, create Code 128 Code Set B image in .NET applications.
FIGURE 24-4
Barcode Maker In None
Using Barcode encoder for Microsoft Word Control to generate, create bar code image in Microsoft Word applications.
Matrix 2D Barcode Encoder In VS .NET
Using Barcode creator for ASP.NET Control to generate, create 2D Barcode image in ASP.NET applications.
Sample output from the ChoiceDemo applet
Using Lists
The List class provides a compact, multiple-choice, scrolling selection list Unlike the Choice object, which shows only the single selected item in the menu, a List object can be constructed to show any number of choices in the visible window It can also be created to allow multiple selections List provides these constructors: List( ) throws HeadlessException List(int numRows) throws HeadlessException List(int numRows, boolean multipleSelect) throws HeadlessException The first version creates a List control that allows only one item to be selected at any one time In the second form, the value of numRows specifies the number of entries in the list that will always be visible (others can be scrolled into view as needed) In the third form, if multipleSelect is true, then the user may select two or more items at a time If it is false, then only one item may be selected To add a selection to the list, call add( ) It has the following two forms: void add(String name) void add(String name, int index) Here, name is the name of the item added to the list The first form adds items to the end of the list The second form adds the item at the index specified by index Indexing begins at zero You can specify 1 to add the item to the end of the list For lists that allow only single selection, you can determine which item is currently selected by calling either getSelectedItem( ) or getSelectedIndex( ) These methods are shown here: String getSelectedItem( ) int getSelectedIndex( ) The getSelectedItem( ) method returns a string containing the name of the item If more than one item is selected, or if no selection has yet been made, null is returned getSelectedIndex( )
Part II:
The Java Library
returns the index of the item The first item is at index 0 If more than one item is selected, or if no selection has yet been made, 1 is returned For lists that allow multiple selection, you must use either getSelectedItems( ) or getSelectedIndexes( ), shown here, to determine the current selections: String[ ] getSelectedItems( ) int[ ] getSelectedIndexes( ) getSelectedItems( ) returns an array containing the names of the currently selected items getSelectedIndexes( ) returns an array containing the indexes of the currently selected items To obtain the number of items in the list, call getItemCount( ) You can set the currently selected item by using the select( ) method with a zero-based integer index These methods are shown here: int getItemCount( ) void select(int index) Given an index, you can obtain the name associated with the item at that index by calling getItem( ), which has this general form: String getItem(int index) Here, index specifies the index of the desired item
Copyright © OnBarcode.com . All rights reserved.