小编给大家分享一下Java多线程中原子性操作类怎么用，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
前言：
在java5以后，我们接触到了线程原子性操作，也就是在修改时我们只需要保证它的那个瞬间是安全的即可，经过相应的包装后可以再处理对象的并发修改，本文总结一下Atomic系列的类的使用方法，其中包含：
1. 基本类型的使用
public class AtomicTest { public static void main(String[] args) { final AtomicTicket ticket = new AtomicTicket(); for (int i = 0; i < 3; i++) { new Thread(new Runnable() { @Override public void run() { while (ticket.getCount() > 0) { System.out.println(Thread.currentThread().getName() + " count: " + ticket.decrement()); } } }).start(); } }}class AtomicTicket { public AtomicInteger count = new AtomicInteger(100); public int decrement() { return count.getAndDecrement(); } public int getCount() { return count.get(); }}Thread-0 count: 100
Thread-2 count: 98
Thread-1 count: 99
Thread-2 count: 96
Thread-0 count: 97
Thread-2 count: 94
Thread-2 count: 92
Thread-1 count: 95
中间省略...
Thread-1 count: 12
Thread-2 count: 7
Thread-0 count: 9
Thread-2 count: 5
Thread-1 count: 6
Thread-2 count: 3
Thread-0 count: 4
Thread-2 count: 1
Thread-1 count: 2
2. 数组类型的使用
public class AtomicIntegerArrayTest { private final static AtomicIntegerArray ATOMIC_INTEGER_ARRAY = new AtomicIntegerArray(new int[]{1,2,3,4,5,6,7,8,9,10}); public static void main(String []args) throws InterruptedException { Thread []threads = new Thread[10]; for(int i = 0 ; i < 10 ; i++) { final int index = i; threads[i] = new Thread() { public void run() { int original = ATOMIC_INTEGER_ARRAY.get(index); int result = ATOMIC_INTEGER_ARRAY.addAndGet(index, index + 1); System.out.println("currentThread：" + Thread.currentThread().getName() + " , 原始值为：" + original + "，增加后的结果为：" + result); } }; threads[i].start(); } for(Thread thread : threads) { thread.join(); } System.out.println("=========================>\n执行已经完成，结果列表："); for(int i = 0 ; i < ATOMIC_INTEGER_ARRAY.length() ; i++) { System.out.println(ATOMIC_INTEGER_ARRAY.get(i)); } }}currentThread：Thread-0 , 原始值为：1，增加后的结果为：2
currentThread：Thread-3 , 原始值为：4，增加后的结果为：8
currentThread：Thread-2 , 原始值为：3，增加后的结果为：6
currentThread：Thread-1 , 原始值为：2，增加后的结果为：4
currentThread：Thread-5 , 原始值为：6，增加后的结果为：12
currentThread：Thread-4 , 原始值为：5，增加后的结果为：10
currentThread：Thread-6 , 原始值为：7，增加后的结果为：14
currentThread：Thread-7 , 原始值为：8，增加后的结果为：16
currentThread：Thread-8 , 原始值为：9，增加后的结果为：18
currentThread：Thread-9 , 原始值为：10，增加后的结果为：20
=========================>执行已经完成，结果列表：
2
4
6
8
10
12
14
16
18
20
3. 引用类型的使用
public class AtomicReferenceTest { public static void main(String[] args) { People people1 =new People("Bom", 0); People people2 =new People("Tom",10); //先初始化一个值，如果不初始化则默认值为null AtomicReference<People> reference = new AtomicReference<>(people1); People people3 = reference.get(); if (people3.equals(people1)) { System.out.println("people3:" + people3); } else { System.out.println("else:" + people3); } boolean b = reference.compareAndSet(null, people2); System.out.println("myClass.main-"+b+"--"+reference.get()); boolean b1 = reference.compareAndSet(people1, people2); System.out.println("myClass.main-"+b1+"--"+reference.get()); new Thread(new Runnable() { @Override public void run() { System.out.println(Thread.currentThread().getName()); People people = reference.get(); people.setName("Tom"+Thread.currentThread().getName()); people.setAge(people.getAge()+1); reference.getAndSet(people); System.out.println(Thread.currentThread().getName()+reference.get().toString()); } }).start(); new Thread(new Runnable() { @Override public void run() { System.out.println(Thread.currentThread().getName()); People people = reference.get(); people.setName("Tom"+Thread.currentThread().getName()); people.setAge(people.getAge()+4); reference.getAndSet(people); System.out.println(Thread.currentThread().getName()+reference.get().toString()); } }).start(); }} class People { private String name; private int age; public People(String name, int age) { this.name = name; this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "People{" + "name='" + name + ''' + ", age=" + age + '}'; }}4.字段类型的使用
public class AtomicIntegerFieldUpdaterTest { public final static AtomicIntegerFieldUpdater<A> ATOMIC_INTEGER_UPDATER = AtomicIntegerFieldUpdater.newUpdater(A.class, "intValue"); public static void main(String[] args) { final A a = new A(); for (int i = 0; i < 10; i++) { new Thread() { public void run() { System.out.println( Thread.currentThread().getName() + " " + ATOMIC_INTEGER_UPDATER.get(a)); ATOMIC_INTEGER_UPDATER.addAndGet(a, 11); System.out.println( Thread.currentThread().getName() + " " + ATOMIC_INTEGER_UPDATER.get(a)); if (ATOMIC_INTEGER_UPDATER.compareAndSet(a, ATOMIC_INTEGER_UPDATER.get(a), 120)) { System.out.println(Thread.currentThread().getName() + " 对应的值做了修改！"); } System.out.println( Thread.currentThread().getName() + " " + ATOMIC_INTEGER_UPDATER.get(a)); } }.start(); } } static class A { volatile int intValue = 100; }}Thread-0 100
Thread-2 100
Thread-1 100
Thread-2 122
Thread-3 111
Thread-5 120
Thread-0 111
Thread-5 142
Thread-3 131
Thread-2 对应的值做了修改！
Thread-2 120
Thread-8 120
Thread-4 133
Thread-1 133
Thread-9 142
Thread-4 142
Thread-4 对应的值做了修改！
Thread-8 131
Thread-3 对应的值做了修改！
Thread-3 120
Thread-7 120
Thread-7 131
Thread-5 对应的值做了修改！
Thread-5 120
Thread-6 120
Thread-0 对应的值做了修改！
Thread-6 131
Thread-7 对应的值做了修改！
Thread-8 对应的值做了修改！
Thread-4 120
Thread-9 131
Thread-1 对应的值做了修改！
Thread-9 对应的值做了修改！
Thread-8 120
Thread-7 120
Thread-6 对应的值做了修改！
Thread-0 131
Thread-6 120
Thread-9 120
Thread-1 120
以上是“Java多线程中原子性操作类怎么用”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注编程网行业资讯频道！
