The selection mode of a JList determines how many items the user can select in the list. By default, the selection mode of a JList is set to SINGLE_SELECTION, which allows the user to select only one item at a time. However, you can set the selection mode to one of the following values:
- SINGLE_SELECTION: allows the user to select only one item at a time (default)
- SINGLE_INTERVAL_SELECTION: allows the user to select a contiguous range of items
- MULTIPLE_INTERVAL_SELECTION: allows the user to select any number of non-contiguous items
To set the selection mode of a JList, you can use the setSelectionMode method, which takes an integer constant as an argument.
Here's an example:
JList<String> list = new JList<String>(items);
list.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
In this example, the JList is created with an array of items as before. Then, the setSelectionMode method is called on the JList instance to set the selection mode to MULTIPLE_INTERVAL_SELECTION, which allows the user to select any number of non-contiguous items.
You will also need to import the ListSelectionModel class from the javax.swing package in order to use the selection mode constants:
import javax.swing.ListSelectionModel;
You can also get the current selection mode of a JList by calling the getSelectionMode method:
int selectionMode = list.getSelectionMode();
This will return an integer constant representing the current selection mode of the JList.
