Java.util.concurrent.atomic.AtomicLong.getAndIncrement()是Java中的一种内置方法，该方法将给定值增加1并在更新之前返回该值，该值数据类型是long。
用法:
public final long getAndIncrement()
参数：该函数不接受单个参数。
返回值：函数将执行增量运算之前的值返回。
以下示例程序旨在说明上述方法：
示例1:
// Java program that demonstrates
// the getAndIncrement() 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.getAndIncrement();
System.out.println("Previous value: "
+ res);
// Prints the updated value
System.out.println("Current value: "
+ val);
}
}
输出：
Previous value: 0
Current value: 1
示例2:
// Java program that demonstrates
// the getAndIncrement() 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);
// Increases 1 and gets
// the previous value
long res = val.getAndIncrement();
System.out.println("Previous value: "
+ res);
// Prints the updated value
System.out.println("Current value: "
+ val);
}
}
输出：
Previous value: 18
Current value: 19