File size to string

filesize.java

public static String getStringSizeLengthFile(long size) {

    DecimalFormat df = new DecimalFormat("0.00");

    float sizeKb = 1024.0f;
    float sizeMo = sizeKb * sizeKb;
    float sizeGo = sizeMo * sizeKb;
    float sizeTerra = sizeGo * sizeKb;


    if(size < sizeMo)
        return df.format(size / sizeKb)+ " Kb";
    else if(size < sizeGo)
        return df.format(size / sizeMo) + " Mo";
    else if(size < sizeTerra)
        return df.format(size / sizeGo) + " Go";

    return "";
}