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JAVA JComboBox

This example shows how to add tooltips to JCombobox item




import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.plaf.basic.*;

public class ToolTipComboBoxExample extends JFrame {

String[] items = {"Apple" ,"Pear" ,"Banana" };
String[] tooltips = {"From apple ","From pear ","From banana "};

public ToolTipComboBoxExample() {
super("ToolTip ComboBox Example");

JComboBox combo = new JComboBox(items);
combo.setRenderer(new MyComboBoxRenderer());

getContentPane().setLayout(new FlowLayout());
getContentPane().add(combo);
}

class MyComboBoxRenderer extends BasicComboBoxRenderer {
public Component getListCellRendererComponent( JList list,
Object value, int index, boolean isSelected, boolean cellHasFocus) {
if (isSelected) {
setBackground(list.getSelectionBackground());
setForeground(list.getSelectionForeground());
if (-1 < index) {
list.setToolTipText(tooltips[index]);
}
} else {
setBackground(list.getBackground());
setForeground(list.getForeground());
}
setFont(list.getFont());
setText((value == null) ? "" : value.toString());
return this;
}
}

public static void main (String args[]) {
ToolTipComboBoxExample frame = new ToolTipComboBoxExample();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
frame.setSize(200, 140);
frame.setVisible(true);
}
}

 


 

 


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Best books about JAVA programming from Amazon
Professional Java, JDK 5 Edition (Paperback Simply Java Programming: An Application-Driven Tutorial Approach (Paperback) Effective Java Programming Language Guide (Paperback) Head First Java, 2nd Edition (Paperback) Java : An Introduction to Problem Solving and Programming (4th Edition)

 

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