— Scott McNealy, Sun Microsystems Chairman, President and ceo

swing
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JList
Constructor
String [] listEntries = {“alpha”, “beta”, “gamma”, “delta”, 
 
 
 
 
“epsilon”, “zeta”, “eta”, “theta “};
list = new JList(listEntries);
How to use it
Make it have a vertical scrollbar
JScrollPane scroller = new JScrollPane(list);
scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
scroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
panel.add(scroller);
1
Restrict the user to selecting only ONE thing at a time
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
3
Register for list selection events
list.addListSelectionListener(this);
4
Handle events (find out which thing in the list was selected)
public void valueChanged(ListSelectionEvent lse) {
 
if( !lse.getValueIsAdjusting()) {
String selection = (String) list.getSelectedValue();
 
System.out.println(selection);
 
}
}
5
Set the number of lines to show before scrolling
list.setVisibleRowCount(4);
2
This is just like with 
JTextArea -- you 
make a 
JScrollPane (and give it the list), then add the 
scroll pane (NOT the list) to the panel.
You’ll get the event TWICE if you don’t 
put in this if test.
getSelectedValue() actually 
returns an Object. A list isn’t 
limited to only String objects.
JList constructor takes an array of any object 
type. They don’t have to be Strings, but a 
String representation will appear in the list.
there are no
Dumb Questions

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