DCL双检查锁机制实现的线程安全的单例模式

public class MyObject {

    private volatile static MyObject myObject;

    private MyObject(){}

    public static MyObject getInstance(){
        try {
            if(myObject != null){

            }else{
                Thread.sleep(3000);
                synchronized ( MyObject.class) {
                    if(myObject == null){
                        myObject = new MyObject();
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return myObject;
    }

}