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Java AtomicBoolean getAndSet()用法及代码示例


Java.util.concurrent.atomic.AtomicBoolean.getAndSet()是Java中的一种内置方法,该方法将给定值设置为参数中传递的值,并在更新前返回该值,该值是布尔值类型。

用法:

public final boolean getAndSet(boolean val)

参数:该函数接受单个强制参数val,该参数指定要更新的值。


返回值:函数将执行更新操作之前的值返回到先前的值。

以下示例程序旨在说明上述方法:

示例1:

// Java program that demonstrates 
// the getAndSet() 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); 
  
        // Updates and sets 
        boolean res 
            = val.getAndSet(true); 
  
        System.out.println("Previous value: "
                           + res); 
  
        // Prints the updated value 
        System.out.println("Current value: "
                           + val); 
    } 
}
输出:
Previous value: false
Current value: true

示例2:

// Java program that demonstrates 
// the getAndSet() 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); 
  
        // Gets and updates 
        boolean res = val.getAndSet(false); 
  
        System.out.println("Previous value: "
                           + res); 
        // Prints the updated value 
        System.out.println("Current value: "
                           + val); 
    } 
}
输出:
Previous value: true
Current value: false

参考: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicBoolean.html#getAndSet-boolean-



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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 getAndSet() 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。