Returns true if the specified file extension can be written

     
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 = canWriteExtension("yourExtensionName"); 
    b = canWriteExtension("gif"); 
    b = canWriteExtension("giF"); 
  }

  public static boolean canWriteExtension(String fileExt) {
    Iterator iter = ImageIO.getImageWritersBySuffix(fileExt);
    return iter.hasNext();
  }
}

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

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