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Java AtomicLong decrementAndGet()用法及代碼示例


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

用法:

public final long decrementAndGet()

參數:該函數不接受單個參數。


返回值:執行減量運算後,該函數將值返回到先前的值。

以下示例程序旨在說明上述方法:

示例1:

// Java program that demonstrates 
// the decrementAndGet() 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); 
  
        // Decremenet and get 
        long res 
            = val.decrementAndGet(); 
  
        // 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 decrementAndGet() 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); 
  
        // Decremenet and get new value 
        long res = val.decrementAndGet(); 
  
        // Prints the updated value 
        System.out.println("Current value: "
                           + res); 
    } 
}
輸出:
Previous value: 18
Current value: 17

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



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注:本文由純淨天空篩選整理自gopaldave大神的英文原創作品 AtomicLong decrementAndGet() method in Java with examples。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。