java - Does object state set in object constructor visible from all threads? -

for example -

public class request {     public string id; //is visible other threads after construction?     public request(string id){         this.id= id;     }    } 

as class not thread safe , thread observe null value id after constructor has finished.

to make sure id visible threads after construction, have several possibilities:

• make field final
• make field volatile
• safely publish request object.

safe publication idioms include:

• initialising instance static initialiser
• marking reference instance volatile
• marking reference instance final
• synchronizing accesses

see this other post explains importance of marking fields final guarantee thread safety of immutable objects.