java.util.concurrent.atomic.AtomicBoolean.compareAndSet()是java中的一种内置方法,如果当前值等于参数给定的期望值,则将值设置为参数中的传递值。该函数返回一个布尔值,该布尔值使我们了解更新是否完成。
用法:
public final boolean compareAndSet(boolean expect, boolean val)
参数:该函数接受两个强制性参数,如下所述:
- expect:它指定原子对象应为的值。
- val:如果原子布尔等于期望值,它指定要更新的值。
返回值:该函数返回一个布尔值,成功则返回true,否则返回false。
以下示例程序旨在说明上述函数:
示例1:
// Java Program to demonstrates
// the compareAndSet() function
import java.util.concurrent.atomic.AtomicBoolean;
public class GFG {
public static void main(String args[])
{
// Initially value as false
AtomicBoolean val = new AtomicBoolean(false);
// Prints the updated value
System.out.println("Previous value: "
+ val);
// Checks if previous value was false
// and then updates it
boolean res = val.compareAndSet(false, true);
// Checks if the value was updated.
if (res)
System.out.println("The value was"
+ " updated and it is "
+ val);
else
System.out.println("The value was "
+ "not updated");
}
}
输出:
Previous value: false The value was updated and it is true
示例2:
// Java Program to demonstrates
// the compareAndSet() function
import java.util.concurrent.atomic.AtomicBoolean;
public class GFG {
public static void main(String args[])
{
// Initially value as true
AtomicBoolean val = new AtomicBoolean(true);
// Prints the updated value
System.out.println("Previous value: "
+ val);
// Checks if previous value was true
// and then updates it
boolean res = val.compareAndSet(true, false);
// Checks if the value was updated.
if (res)
System.out.println("The value was"
+ " updated and it is "
+ val);
else
System.out.println("The value was "
+ "not updated");
}
}
输出:
Previous value: true The value was updated and it is false
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注:本文由纯净天空筛选整理自gopaldave大神的英文原创作品 AtomicBoolean compareAndSet() method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。