Different Heights for JList Elements

Question

Either the height does not change,Or the size of the full list changes.
Suggestions??
class CustomRenderer extends JLabel implements ListCellRenderer
int newHeight;
int flag=0;
int index;
public CustomRenderer(int newHeight,int resizingRow)
//newHeight to be assigned to tat particular list element
this.newHeight=newHeight;
//Row of List to Resized
this.index=resizingRow;
setOpaque( true );
public Component getListCellRendererComponent(
JList list, Object value, int index, boolean isSelected, boolean cellHasFocus)
if(index==resizingRow){                           
flag=1;
setText(value.toString());
list.setFixedCellHeight(-1);
Dimension d = getPreferredSize();
d.height = newHeight;
setPreferredSize(d);
else{   
flag=0;
setText(value.toString());
Dimension d = getPreferredSize(newHeight);
setPreferredSize(d);
return this;
public Dimension getPreferredSize() {
if(flag==1){
//Wen clicked on the particular Index, Resize it
Dimension dim = super.getPreferredSize();
return new Dimension(dim.width,newHeight);
else{
//Else Let it be the same size
Dimension dim = super.getPreferredSize();
JOptionPane.showMessageDialog(this,""+super.getPreferredSize());
return new Dimension(dim.width,50);
public Dimension getPreferredSize(int newHeight) {
Dimension dim = super.getPreferredSize();
return new Dimension(dim);
}

Answer 1

try this
import javax.swing.*;
import java.awt.*;
import javax.swing.event.*;
class Testing extends JFrame
  String[] cities = {"London","Madrid","New York","Rome","Sydney","Toronto","Washington"};
  DefaultListModel listModel = new DefaultListModel();
  JList list = new JList(listModel);
  public Testing()
    setLocation(400,300);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    list.setCellRenderer(new MyRenderer());
    for(int x = 0; x < cities.length; x++) listModel.addElement(cities[x]);
    JScrollPane sp = new JScrollPane(list);
    sp.setPreferredSize(new Dimension(100,150));
    getContentPane().add(sp);
    pack();
    list.addListSelectionListener(new ListSelectionListener(){
      public void valueChanged(ListSelectionEvent lse){
        if(lse.getValueIsAdjusting() == false)
          for(int x = 0; x < listModel.size(); x++)
            listModel.setElementAt(listModel.getElementAt(x),x);
  public static void main(String[] args){new Testing().setVisible(true);}
class MyRenderer extends DefaultListCellRenderer
  public Component getListCellRendererComponent(JList list,Object value,
                      int index,boolean isSelected,boolean cellHasFocus)
    JLabel lbl = (JLabel)super.getListCellRendererComponent(list,value,index,isSelected,cellHasFocus);
    if(list.getSelectedIndex() == index) lbl.setPreferredSize(new Dimension(100,75));
    else lbl.setPreferredSize(new Dimension(100,20));
    return lbl;
}