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How can I put a CASE SWITCH on a JList?

Posted on 2008-10-21
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Last Modified: 2012-05-05
How can I put a case switch on JList selection entered?  

case one:
case two:
case three:
case four:
case five:
import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
 
    public class Lister {
      public static void main(String[] args) {
        JFrame frame = new JFrame("Lister v1.0");
 
 
        String [] items = { "one", "two", "three", "four", "five" };
 
 
 
        final JList list = new JList(items);
 
        // create a button; when it's pressed, print out
        // the selection in the list
        JButton button = new JButton("Per favore");
        button.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent ae) {
            Object[] selection = list.getSelectedValues();
            System.out.println("-----");
            for ( Object o : selection )
              System.out.println( o );
          }
        });
 
        // put the controls the content pane
        Container c = frame.getContentPane();  // unnecessary  in 5.0+
        JPanel comboPanel = new JPanel();
        c.add(new JScrollPane(list), BorderLayout.CENTER);
        c.add(button, BorderLayout.SOUTH);
 
        frame.setSize(200, 200);
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        frame.setVisible(true);
      }
    }

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Question by:glynco
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2 Comments
 
LVL 8

Accepted Solution

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MatthiasVance earned 500 total points
ID: 22765527
First of all you should change the selection mode of your control, then you can use list.getSelectedValue(). Note that you cannot use a string in a switch, so you have to think of something else to do (maybe a private class that holds the string and the numerical value of it, and then switch() the numerical value).

Kind regards,

Matthias Vance
// Private Value class
private class Value {
    		public String text;
    		public int num;
    		Value(String text, int num) {
    			this.text = text;
    			this.num = num;
    		}
    		public String toString(){
				return text;
    		}
    	}
 
// Change selection mode
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
 
// Get selected value
Value selection = (Value)list.getSelectedValue();
            switch(selection.num) {
            	case 1:
            		System.out.println("You selected one!");
            		break;
            }

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Expert Comment

by:muktajindal
ID: 22765826
You may use Enum instead of String if you want to use switch-case here.
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