Java AtomicLong compareAndSet() 方法

2025 年 3 月 20 日 | 阅读 2 分钟

Java AtomicLong 类的 compareAndSet() 方法会将 AtomicLong 实例的当前值与期望值进行比较，如果两个值相等，则为 AtomicLong 实例设置新值。

语法

参数

expectedValue - 期望值

newValue - 新值

示例 1

import java.util.concurrent.atomic.AtomicLong;

public class AtomicLongCompareAndSetExample1 {
	
	public static void main (String [] args) {
		AtomicLong atomiclong = new AtomicLong(111);
		long expectedValue = 11;
		long newValue      = 222;
		atomiclong.compareAndSet(expectedValue, newValue);
		//Since Initialized value and expected value are not equal prints the initialized value
		System.out.println(atomiclong);
	}

}

输出

示例 2

import java.util.concurrent.atomic.AtomicLong;

public class AtomicLongCompareAndSetExample2 {
	
	public static void main (String [] args) {
		AtomicLong atomiclong = new AtomicLong(111);
		long expectedValue = 111;
		long newValue      = 222;
		atomiclong.compareAndSet(expectedValue, newValue);
		//Since Initialized value and expected value are equal prints the new value
		System.out.println(atomiclong);
	}

}

输出

示例 3

import java.util.concurrent.atomic.AtomicLong;

public class AtomicLongCompareAndSetExample3 {
	
	public static void main (String [] args) {
		AtomicLong atomiclong = new AtomicLong();
		long expectedValue = 0;
		long newValue      = -1;
		atomiclong.compareAndSet(expectedValue, newValue);
		//Since Initialized value and expected value are equal prints the new value
		System.out.println(atomiclong);
	}

}

输出

-1

示例 4

import java.util.concurrent.atomic.AtomicLong;

public class AtomicLongCompareAndSetExample4 {
	
	public static void main (String [] args) {
		AtomicLong atomiclong = new AtomicLong(-10);
		long expectedValue = 10;
		long newValue      = -20;
		atomiclong.compareAndSet(expectedValue, newValue);
		//Since Initialized value and expected value are not equal prints the Initialized value
		System.out.println(atomiclong);
	}

}

输出

-10

下一个主题Java AtomicLong

Java AtomicLong compareAndSet() 方法

语法

参数

示例 1

示例 2

示例 3

示例 4

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Java AtomicLong compareAndSet() 方法

语法

参数

示例 1

示例 2

示例 3

示例 4

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