Java中的 AtomicLong incrementAndGet() 方法及示例

Java.util.concurrent.atomic.AtomicLong.incrementAndGet()是Java中的一种内置方法，它将先前的值加一，并在更新后返回数据类型为long的值。

句法：

public final long incrementAndGet()

参数：该函数不接受单个参数。
返回值：函数将递增操作后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

// Java program that demonstrates
// the incrementAndGet() 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);
 
        System.out.println("Previous value: "
                           + val);
 
        // Increment and get
        long res
            = val.incrementAndGet();
 
        // Prints the updated value
        System.out.println("Current value: "
                           + res);
    }
}

输出：

Previous value: 0
Current value: 1

方案二：

Java

// Java program that demonstrates
// the incrementAndGet() 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);
 
        System.out.println("Previous value: "
                           + val);
 
        // Increment and get new value
        long res = val.incrementAndGet();
 
        // Prints the updated value
        System.out.println("Current value: "
                           + res);
    }
}

输出：

Previous value: 18
Current value: 19

参考： https: Java/util/concurrent/atomic/AtomicLong.html#incrementAndGet-