Java多线程之原子操作类

淡淡的烟草味﹌ 2022-02-16 12:56 313阅读 0赞

## 一、原子操作类 ##

原子操作类有三大类：（1）基本类型，有AtomicInteger、AtomicLong、AtomicBoolean，（2）数组类型，AtomcixxxArray，（3）引用类型，AtomicReference

## 二、例子 ##

import java.util.concurrent.atomic.AtomicIntegerArray;
    import java.util.concurrent.atomic.AtomicLong;
    import java.util.concurrent.atomic.AtomicReference;
    
    public class AtomicTest {
    
        public static void main(String[] args) {
            System.out.println("=========AtomicLong==========");
            //原子基本类型 AtomicBoolean AtomicInteger AtomicLong
            AtomicLong aLong = new AtomicLong(3);
            System.out.println(aLong.incrementAndGet());
            System.out.println("========AtomicIntegerArray===========");
            //原子数组 AtomicIntegerArray
            int[] value = new int[]{1,2,3};
            AtomicIntegerArray ai = new AtomicIntegerArray(value);
            System.out.println(ai.getAndSet(0,10));
            System.out.println(ai.get(0));
            System.out.println("========AtomicReference===========");
            //原子引用类型
            AtomicReference<User> aUser = new AtomicReference<User>();
            User user = new User("luke",10);
            aUser.set(user);
            User updateUser = new User("luke2",20);
            User oldUser = aUser.getAndSet(updateUser);
            System.out.println("old user: "+oldUser);
            User newUser = aUser.get();
            System.out.println("new user: "+newUser);
        }
    
        static class User {
    
            private String name;
    
            private Integer age;
    
            public User(String name, Integer age) {
                this.name = name;
                this.age = age;
            }
    
            public String getName() {
                return name;
            }
    
            public void setName(String name) {
                this.name = name;
            }
    
            public Integer getAge() {
                return age;
            }
    
            public void setAge(Integer age) {
                this.age = age;
            }
    
            @Override
            public String toString() {
                return "User{" +
                        "name='" + name + '\'' +
                        ", age=" + age +
                        '}';
            }
    
        }
    
    }

## 三、结果 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA3Mzk1NTE_size_16_color_FFFFFF_t_70][]

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