Returns true if the specified file extension can be read

     
import java.io.File;
import java.util.Iterator;

import javax.imageio.ImageIO;

public class Main {
  public static void main(String[] argv) throws Exception {
    boolean b;

    b = canReadExtension("yourExtensionName"); 
    b = canReadExtension("gif"); 
    b = canReadExtension("giF"); 
  }
  public static boolean canReadExtension(String fileExt) {
    Iterator iter = ImageIO.getImageReadersBySuffix(fileExt);
    return iter.hasNext();
  }

}

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Returns true if the specified file extension can be read : Image IO « 2D Graphics GUI « Java

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