Java AtomicLong weakCompareAndSet() 方法

2025 年 3 月 20 日 | 阅读 2 分钟

java AtomicLong 类的 weakCompareAndSet() 方法在当前值等于预期值的情况下，原子地将值设置为给定的更新值。它可能会出现虚假失败，并且不提供顺序保证，因此很少是 compareAndSet 的合适替代方案。

语法

@Deprecated(since="9")
	public final boolean weakCompareAndSet(long expectedValue,
                                       long newValue)

参数

expectedValue - 预期值

newValue - 新值

返回值

如果成功则返回 true

示例 1

import java.util.concurrent.atomic.AtomicLong;
public class AtomicLongWeakCompareAndSetExample1 {
	public static void main (String [] args) {
		AtomicLong atomiclong = new AtomicLong();
		long expectedValue = 0;
		long newValue = 111;
		atomiclong.weakCompareAndSet(expectedValue, newValue);
		//Since Initialized value and expected value are equal prints the new value
		System.out.println(atomiclong);
	}
}

输出

示例 2

import java.util.concurrent.atomic.AtomicLong;
public class AtomicLongWeakCompareAndSetExample2 {
public static void main (String [] args) {
		AtomicLong atomiclong = new AtomicLong();
		long expectedValue = 222;
		long newValue = 111;
		atomiclong.weakCompareAndSet(expectedValue, newValue);
		//Since Initialized value and expected value are not equal prints the Initialized value
		System.out.println(atomiclong);
	}
}

输出

示例 3

import java.util.concurrent.atomic.AtomicLong;
public class AtomicLongWeakCompareAndSetExample3 {
	public static void main (String [] args) {
		AtomicLong atomiclong = new AtomicLong(222);
		long expectedValue = 222;
		long newValue = -45;
		atomiclong.weakCompareAndSet(expectedValue, newValue);
		//Since Initialized value and expected value are equal prints the New value
		System.out.println(atomiclong);
	}
}

输出

-45

示例 4

import java.util.concurrent.atomic.AtomicLong;
public class AtomicLongWeakCompareAndSetExample4 {
	public static void main (String [] args) {
		AtomicLong atomiclong = new AtomicLong(-10);
		long expectedValue = 10;
		long newValue = -20;
		atomiclong.weakCompareAndSet(expectedValue, newValue);
		//Since Initialized value and expected value are not equal prints the Initialized value
		System.out.println(atomiclong);
	}
}

输出

-10

下一主题Java AtomicLong 类

Java AtomicLong weakCompareAndSet() 方法

语法

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示例 1

示例 2

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示例 4

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Java AtomicLong weakCompareAndSet() 方法

语法

参数

返回值

示例 1

示例 2

示例 3

示例 4

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