Is a class without fields thread safe

Question

If I make a class with only methods and no variables, with each method having its own local variable then, will that class be thread-safe? for eg.

   public class Client {

                public String xyz(final String inputXML) {
                      DataInputStream dis = null;
                      DataOutputStream dout = null;
                      Socket clientSocket = null;
                        //do some processing 
                    }

                public String abc(final String inputXML) {
                      DataInputStream dis = null;
                      DataOutputStream dout = null;
                      Socket clientSocket = null;
                        //do some processing 
                    }
        }

now if I launch multiple threads of this Client then, will the class be thread safe ?

Answer 1

Yes your class is thread safe.

A method is thread safe if:

• has no access to shared variables
• Access to shared immutable variables
• Access to variables which state can be modified only in a thread safe manner (for example via synchronized methods)
• Access to variables with a synchronized block using the same lock of other threads that use the same variable

Your methods haven't access to shared variables so are thread safe