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📜  Java中的 AtomicLong getAndDecrement() 方法及示例

📅  最后修改于: 2022-05-13 01:55:34.632000             🧑  作者: Mango

Java中的 AtomicLong getAndDecrement() 方法及示例

Java.util.concurrent.atomic.AtomicLong.getAndDecrement()是Java中的一种内置方法,它将给定值减一并返回更新前的值,该值是数据类型long

句法:

public final long getAndDecrement()

参数:该函数不接受单个参数。

返回值:函数将执行减量操作前的值返回到前一个值。

下面的程序说明了上述方法:

方案一:

// Java program that demonstrates
// the getAndDecrement() function
  
import java.util.concurrent.atomic.AtomicLong;
  
public class GFG {
    public static void main(String args[])
    {
  
        // Initially value as 0
        AtomicLong val
            = new AtomicLong(0);
  
        // Decreases and gets
        // the previous value
        long res
            = val.getAndDecrement();
  
        // Prints the updated value
        System.out.println("Previous value: "
                           + res);
  
        System.out.println("Current value: "
                           + val);
    }
}
输出:
Previous value: 0
Current value: -1

方案二:

// Java program that demonstrates
// the getAndDecrement() function
  
import java.util.concurrent.atomic.AtomicLong;
  
public class GFG {
    public static void main(String args[])
    {
  
        // Initially value as 18
        AtomicLong val
            = new AtomicLong(18);
  
        // Decreases 1 and gets
        // the previous value
        long res = val.getAndDecrement();
  
        // Prints the updated value
        System.out.println("Previous value: "
                           + res);
  
        System.out.println("Current value: "
                           + val);
    }
}
输出:
Previous value: 18
Current value: 17

参考: https: Java/util/concurrent/atomic/AtomicLong.html#getAndDecrement–