Java AtomicLong getAndIncrement()用法及代碼示例

Java.util.concurrent.atomic.AtomicLong.getAndIncrement()是Java中的一種內置方法，該方法將給定值增加1並在更新之前返回該值，該值數據類型是long。

用法:

public final long getAndIncrement()

參數：該函數不接受單個參數。

返回值：函數將執行增量運算之前的值返回。

以下示例程序旨在說明上述方法：

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); 
    } 
}

輸出：

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); 
    } 
}

輸出：

Previous value: 18
Current value: 19

參考： https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLong.html#getAndIncrement–

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