When should I use Atomicreference?

When should I use Atomicreference?

An atomic reference is ideal to use when you need to share and change the state of an immutable object between multiple threads. That is a super dense statement, so I will break it down a bit. First, an immutable object is an object that is effectively not changed after construction.

When should I use AtomicBoolean?

An AtomicBoolean is used in applications such as atomically updated flags, and cannot be used as a replacement for a Boolean .

What is the purpose of AtomicBoolean?

AtomicBoolean class provides operations on underlying boolean value that can be read and written atomically, and also contains advanced atomic operations. AtomicBoolean supports atomic operations on underlying boolean variable. It have get and set methods that work like reads and writes on volatile variables.

Is volatile needed with synchronized?

If it is accessed only from synchronized blocks is not needed the volatile keyword. Synchronized guarantees that changes to variables accessed inside the synchronized block are visible to all threads entering a synchronized block.

Is AtomicReference volatile?

No, there is not. The additional power provided by AtomicReference is the compareAndSet() method and friends.

What is the difference between AtomicBoolean and boolean?

AtomicBoolean has methods that perform their compound operations atomically and without having to use a synchronized block. On the other hand, volatile boolean can only perform compound operations if done so within a synchronized block.

How does AtomicBoolean compare?

The method compareAndSet() allows you to compare the current value of the AtomicBoolean to an expected value, and if current value is equal to the expected value, a new value can be set on the AtomicBoolean . The compareAndSet() method is atomic, so only a single thread can execute it at the same time.

Can volatile replace synchronized?

We can solve this problem by using a volatile modifier. If a variable is declared as volatile as for every thread JVM will create a separate local copy….Java.

Is volatile expensive?

Generally speaking, on most modern processors a volatile load is comparable to a normal load. A volatile store is about 1/3 the time of a montior-enter/monitor-exit. This is seen on systems that are cache coherent. To answer the OP’s question, volatile writes are expensive while the reads usually are not.

What is the difference between volatile and synchronized?

We can solve this problem by using a volatile modifier. If a variable is declared as volatile as for every thread JVM will create a separate local copy….Output.