Java 中的 AtomicLong getAndIncrement()方法,带示例
原文:https://www . geesforgeks . org/atomiclong-getandincrement-method-in-Java-with-examples/
Java . util . concurrent . atomic . atomic clong . GetAnDicrement()是 Java 中的一个内置方法,它将给定值增加 1,并在更新前返回数据类型为 long 的值。
语法:
public final long getAndIncrement()
参数:函数不接受单个参数。
返回值:该函数将执行增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:
程序 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
程序二:
// 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
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