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How to set a tooltip text for each item of a JList in Java?
A JList is a subclass of JComponent class and it can be used to display a list of objects that allows the user to select one or more items. A JList can generate a ListSelectiionListener interface and need to implement the abstract method valueChanged(). A JToolTip class is used to display a text or a tip of the component, we can set a tooltip text for each item of a list by implementing the getToolTipText() method of JToolTip class.
Example
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class JListTooltipTest extends JFrame {
private Vector vector;
public JListTooltipTest() {
setTitle("JListTooltip Test");
setLayout(new FlowLayout());
vector = new Vector();
for (int i=1; i < 15; i++) {
vector.addElement("Item #" + i);
}
final JList list = new JList(vector) {
public String getToolTipText(MouseEvent me) {
int index = locationToIndex(me.getPoint());
if (index > -1) {
String item = (String) getModel().getElementAt(index);
return "Tooltip for " + item;
}
return null;
}
};
list.setToolTipText("");
add(new JScrollPane(list));
setSize(375, 250);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
public static void main(String[] args) {
new JListTooltipTest();
}
}Output
Updated on: 10-Feb-2020
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