ListModel: getElementAt(int index)

ListModel: getElementAt(int index)

ListModel: getElementAt(int index)  method is used to get a specific element at a specified Index x.
Other JList methods and Listener you should check out are ListSelectionListener , Java JList:getModel

ListModel: getElementAt(int index) Example

[

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
public class JavaJListExample extends JFrame  {
    public JList list;

    JavaJListExample()
    {
        super("JList");

        String language []={"Java","C++","PHP","Python","C#"};
        list=new JList();
        list.setListData(language);
        list.setVisibleRowCount(3);

        JScrollPane pane=new JScrollPane(list);
        pane.setBounds(50, 20, 100, 50);
        add(pane);

        list.addMouseListener(new MouseAdapter()
        {
            public void mouseClicked(MouseEvent event)
            {
                list=(JList)event.getSource();
                if(event.getClickCount()==2)
                {
                    int i=list.locationToIndex(event.getPoint());
                    if(i>=0)
                    {
                        Object object=list.getModel().getElementAt(i);
                        String s=object.toString();
                        JOptionPane.showMessageDialog(null,"You Double clicked on "+ s,
                                "JList getElement",JOptionPane.INFORMATION_MESSAGE);

                    }
                }

            }
        });



        setSize(400,400);
        setLayout(null);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String args[])
    {
        new JavaJListExample();

    }

}

]

ListModel: getElementAt(int index) Code Explanation

When user double clicks on a item in JList ..this code is executed[ list.addMouseListener(new MouseAdapter()

        {
            public void mouseClicked(MouseEvent event)
            {
                list=(JList)event.getSource();
                if(event.getClickCount()==2)
                {
                    int i=list.locationToIndex(event.getPoint());
                    if(i>=0)
                    {
                        Object object=list.getModel().getElementAt(i);
                        String s=object.toString();
                        JOptionPane.showMessageDialog(null,"You Double clicked on "+ s,
                                "JList getElement",JOptionPane.INFORMATION_MESSAGE);

                    }
                }

            }
        });

]

A JOptionPane showMessage Dialog pops up displaying the item that has been double-clicked.

Other methods used in this program 

• [pane.setBounds(50, 20, 100, 50);] -sets JScrollPane location on JFrame window.
• [ setDefaultCloseOperation(EXIT_ON_CLOSE);]-sets default close operation of JFrame window i.e..exits application.

See also:

Java JList:getModel() method

JList addJListSelectionListener