Checking for an object being null in Java

I am writing my code in Java where I am creating an object and and accessing it in two different threads. My first thread1 thread calls some public methods on this object at runtime.

final Thread thread1 = new Thread(){
    @Override
    public void run() {
        myObj.pubFunc1();
        myObj.puFunc2();
        myObj.pubFunc3();
    }
};

I have another thread thread2 which might release this object and set it to nulllike:

final Thread thread2 = new Thread(){
    @Override
    public void run() {
        myObj.release();
        myObj = null;
    }
};

My question is if I should put check for null around each statement in my thread1 like this?

final Thread thread1 = new Thread(){
        @Override
        public void run() {
            if(myObj != null) {
                myObj.pubFunc1();
            }
            if(myObj != null) {
                myObj.pubFunc2();
            }
            if(myObj != null) {
                myObj.pubFunc3();
            }
        }
    };

OR only one check around all the statements is enough? The basic question that might originate from this is there is a lock around the object on which we have made a null check? How to handle this situation. What design pattern should I use to handle this situation.

NOTE: I do not want the three statements to be necessarily executed and I even do no want that the three statements form an atomic unit. I just want to perform an operation if the object I am performing the operation on is not null.