How to update ACL of a file in Google Cloud Storage using Java API -

i trying upload image google cloud storage , add acl of

allusers  reader 

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java code , question

public static storageobject uploadsimpleimageandmakeitpublic(         storage storage, string bucketname, string objectname,         inputstream imagedata) throws ioexception {     inputstreamcontent mediacontent = new inputstreamcontent("image/png", imagedata);     storage.objects.insert insertobject = storage.objects().insert(bucketname, null, mediacontent).setname(objectname);     insertobject.getmediahttpuploader().setdisablegzipcontent(true);     storageobject uploadedimage = insertobject.execute();      // new acl make public     objectaccesscontrol publicaclitem = new objectaccesscontrol();     publicaclitem.setentity("allusers");     publicaclitem.setrole("reader");      uploadedimage.getacl().add(publicaclitem);      // how update acl ???     // , how fetch public url ??         } 

i using:

 <dependency>       <groupid>com.google.apis</groupid>       <artifactid>google-api-services-storage</artifactid>       <version>v1-rev18-1.19.0</version>     </dependency> 

got it

public static storageobject uploadsimpleimageandmakeitpublic(             storage storage, string bucketname, string objectname,             inputstream imagedata) throws ioexception {         inputstreamcontent mediacontent = new inputstreamcontent("image/png", imagedata);         storage.objects.insert insertobject = storage.objects()                             .insert(bucketname, null, mediacontent).setname(objectname);         insertobject.getmediahttpuploader().setdisablegzipcontent(true);         storageobject uploadedimage = insertobject.execute();          // new acl make public         objectaccesscontrol publicaclitem = new objectaccesscontrol();         publicaclitem.setentity("allusers");         publicaclitem.setrole("reader");         insert insert = storage.objectaccesscontrols().insert(bucketname, objectname, publicaclitem);         insert.execute();         return uploadedimage;                    }