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Java AtomicLong incrementAndGet()用法及代碼示例


Java.util.concurrent.atomic.AtomicLong.incrementAndGet()是Java中的一種內置方法,該方法將先前值增加1,並在更新後返回long數據類型的值。

用法:

public final long incrementAndGet()

參數:該函數不接受單個參數。


返回值:該函數將執行增量運算之後的值返回。

以下示例程序旨在說明上述方法:

示例1:

// Java program that demonstrates 
// the 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); 
  
        // Incremenet and get 
        long res 
            = val.incrementAndGet(); 
  
        // Prints the updated value 
        System.out.println("Current value: "
                           + res); 
    } 
}
輸出:
Previous value: 0
Current value: 1

示例2:

// 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); 
  
        // Incremenet and get new value 
        long res = val.incrementAndGet(); 
  
        // Prints the updated value 
        System.out.println("Current value: "
                           + res); 
    } 
}
輸出:
Previous value: 18
Current value: 19

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



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