Java AtomicLongArray addAndGet()用法及代碼示例

Java.util.concurrent.atomic.AtomicLongArray.addAndGet()是Java中的一種內置方法，該方法原子地將給定值添加到AtomicLongArray索引處的元素。此方法將索引值和要添加的值作為參數，並在該索引處返回更新後的值。

用法:

public long addAndGet(int i, long delta)

參數：該函數接受兩個參數：

i–要在其中添加值的索引。
delta – The value to be added.

返回值：函數返回的更新值過長。

以下示例程序旨在說明上述方法：
示例1:

// Java program that demonstrates 
// the addAndGet() function 
  
import java.util.concurrent.atomic.AtomicLongArray; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
        // Initializing an array 
        long a[] = { 10, 22, 33, 44, 55 }; 
  
        // Initializing an AtomicLongArray with array a 
        AtomicLongArray arr = new AtomicLongArray(a); 
  
        // Displaying the AtomicLongArray 
        System.out.println("The array : " + arr); 
  
        // Index where value is to be added 
        int idx = 0; 
  
        // Value to add with value at idx 
        long x = 16; 
  
        // Updating the value at 
        // idx applying addAndGet 
        arr.addAndGet(idx, x); 
  
        // Displaying the AtomicLongArray 
        System.out.println("The array after update : "
                           + arr); 
    } 
}

輸出：

The array : [10, 22, 33, 44, 55]
The array after update : [26, 22, 33, 44, 55]

示例2:

// Java program that demonstrates 
// the addAndGet() function 
  
import java.util.concurrent.atomic.AtomicLongArray; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
        // Initializing an array 
        long a[] = { 1, 2, 3, 4, 5 }; 
  
        // Initializing an AtomicLongArray with array a 
        AtomicLongArray arr = new AtomicLongArray(a); 
  
        // Displaying the AtomicLongArray 
        System.out.println("The array : " + arr); 
  
        // Index where value is to be added 
        int idx = 3; 
  
        // Value to add with value at idx 
        long x = 16; 
  
        // Updating the value at 
        // idx applying addAndGet 
        arr.addAndGet(idx, x); 
  
        // Displaying the AtomicLongArray 
        System.out.println("The array after update : "
                           + arr); 
    } 
}

輸出：

The array : [1, 2, 3, 4, 5]
The array after update : [1, 2, 3, 20, 5]

參考：
https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLongArray.html#addAndGet-int-long-

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注：本文由純淨天空篩選整理自rupesh_rao大神的英文原創作品 AtomicLongArray addAndGet() 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。