some help

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
 * Test class to simulate how a "gif" works.
 */
public class Test extends Actor
{
    private final String imageName = "Vegeta_";
    private int timeDurationToNextImage, currentIndex, counter;
    private int numberOfImages;
    
    // To work, you have to name your images right.
    // it goes through each image from 0 - (numberOfImages - 1)
    // hope it helps
    public void act() {
        if ( currentIndex < numberOfImages ) {
            // Like: setImage( "Vegeta_0.png" ); 
            setImage( imageName + currentIndex + ".png" );  
            if ( counter >= timeDurationToNextImage ) {
                counter = 0;
                currentIndex += 1;
            } else {
                counter += 1;
            }
        } else {
            currentIndex= 0;
        }     
    }
}