When writing multi-threaded applications, it is very important to consider thread safety. Ensuring thread safety, enabling multiple threads to work together, and improving program running efficiency is an issue worthy of full consideration. Java provides many atomic operation functions, including the atomic integer operation function - AtomicInteger.

AtomicInteger is an atomic class in Java that can implement atomic operations on an integer variable. The so-called atomic operation means that only one thread can perform modification operations at the same time, so that data inconsistency will not be caused when multiple threads perform modifications concurrently.

In this article, we will introduce how to perform atomic operations using the AtomicInteger function in Java.

First, we need to introduce the AtomicInteger class in Java. The code is as follows:

import java.util.concurrent.atomic.AtomicInteger;

The AtomicInteger class has a constructor that can initialize an integer variable. The code is as follows:

AtomicInteger  atomicInt = new AtomicInteger(0);

Next, we introduce several commonly used methods in AtomicInteger:

1. addAndGet(int delta)

This method can Atomic integer variables are added and the new value is returned. The code is as follows:

atomicInt.addAndGet(2);

The above code can increase the atomic integer variable by 2 and return the new value. In a multi-threaded environment, each thread can execute the statement, but the final result is atomic.

2. compareAndSet(int expect, int update)

This method can compare whether the value of the current atomic integer variable is equal to expect. If equal, update the value to update, and Returns true; otherwise returns false. The code is as follows:

atomicInt.compareAndSet(0, 2);

The above code can update the value of the atomic integer variable from 0 to 2. In a multi-threaded environment, if multiple threads execute this statement at the same time, only one thread can successfully update, and the other threads will return false. This method can be used to implement concurrent CAS (Compare And Swap) operations.

3. getAndIncrement()

This method can increment the atomic integer variable by 1 and return the original value. The code is as follows:

int oldValue = atomicInt.getAndIncrement();

The above code can increment the atomic integer variable by 1 and return the value before the increment. In a multi-threaded environment, each thread can execute this statement, and operations on atomic integer variables are guaranteed to be atomic.

4. get()

This method can get the value of the current atomic integer variable. The code is as follows:

int value = atomicInt.get();

The above code can get the value of the current atomic integer variable. In a multi-threaded environment, each thread can execute this statement and the obtained value is guaranteed to be atomic.

To sum up, the AtomicInteger function in Java provides an efficient and thread-safe atomic operation method, which can effectively ensure the correctness and performance of the program. When developing multi-threaded applications, we need to make full use of the AtomicInteger function to perform atomic operations to ensure the correctness and efficiency of the code.

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