Java AtomicLong get()用法及代碼示例

Java.util.concurrent.atomic.AtomicLong.get()是java中的內置方法，該方法返回long類型的當前值。

用法:

public final long get()

參數：該函數不接受任何參數。

返回值：該函數返回當前值

以下示例程序旨在說明上述方法：

示例1:

// Java program that demonstrates 
// the get() 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); 
  
        val.addAndGet(7); 
  
        // Prints the updated value 
        System.out.println("Previous value: "
                           + val); 
  
        // Gets the current value 
        long res = val.get(); 
  
        System.out.println("current value: "
                           + res); 
    } 
}

輸出：

Previous value: 7
current value: 7

示例2:

// Java program that demonstrates 
// the get() 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); 
  
        val.addAndGet(7); 
  
        // Prints the updated value 
        System.out.println("Previous value: "
                           + val); 
  
        // Gets the current value 
        long res = val.get(); 
  
        System.out.println("current value: "
                           + res); 
    } 
}

輸出：

Previous value: 25
current value: 25

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

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