A single-selection JList. : List « Swing JFC « Java

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Java » Swing JFC » List

A single-selection JList.






import java.awt.FlowLayout;



import javax.swing.JFrame;

import javax.swing.JList;

import javax.swing.JScrollPane;

import javax.swing.ListSelectionModel;

import javax.swing.event.ListSelectionEvent;

import javax.swing.event.ListSelectionListener;



public class Main {



  String languages[] = { "Java", "Perl", "Python", "C++", "Basic", "C#" };



  JList jlst = new JList(languages);



  Main() {

    JFrame jfrm = new JFrame("Use JList");

    jfrm.setLayout(new FlowLayout());

    jfrm.setSize(200, 160);

    jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    jlst.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

    jlst.addListSelectionListener(new ListSelectionListener() {

      public void valueChanged(ListSelectionEvent le) {

        int idx = jlst.getSelectedIndex();

        if (idx != -1)

          System.out.println("Current selection: " + languages[idx]);

        else

          System.out.println("Please choose a language.");

      }

    });



    jfrm.add(new JScrollPane(jlst));

    jfrm.setSize(300, 300);

    jfrm.setVisible(true);

  }



  public static void main(String args[]) {

    new Main();

  }

}

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38.	Listening for Changes to the Items in a JList Component
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42.	changes the layout orientation so that its items are displayed top-to-bottom and left-to-right.
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45.	The selected items must be in a contiguous range
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48.	import javax.swing.JList;
49.	Select all the items
50.	Clear all selections
51.	Select the first item
52.	Add another selection - the third item
53.	Deselect the first item
54.	Select a single item
55.	Getting the Selected Items in a JList Component
56.	Get the index of the last selected item
57.	Determine if the third item is selected
58.	Determine if there are any selected items
59.	Return the selected item objects:
60.	Adding and Removing an Item in a JList Component
61.	Append an item
62.	Insert an item at the beginning
63.	Create a list that allows adds and removes
64.	Set method replaces an item
65.	Methods are used to remove items
66.	Getting the Items in a JList Component
67.	Methods are used to find an item:
68.	These methods can be used to find the range of visible items:
69.	Get index of first visible item
70.	Get index of last visible item
71.	Setting a Tool Tip for an Item in a JList Component
72.	Setting the Dimensions of an Item in a JList Component
73.	It is also possible to set the item dimensions using a sample value:
74.	Creating a JList Component
75.	The items can be arbitrary objects. The toString() method of the objects is displayed in the list component.
76.	Determining the Selected JRadioButton in a Button Group
77.	A spinner that rolls from the end of a list to beginning

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