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Java AtomicInteger getAndSet()用法及代碼示例


java.util.concurrent.atomic.AtomicInteger.getAndSet()是java中的一種內置方法,它將給定值設置為參數中傳遞的值,並在更新之前返回該值,該值是數據類型int。

用法:

public final int getAndSet(int val)

參數:該函數接受單個強製參數val,該參數指定要更新的值。


返回值:函數將執行更新操作之前的值返回到先前的值。

以下程序演示了該函數:

示例1:

// Java program that demonstrates 
// the getAndSet() function 
  
import java.util.concurrent.atomic.AtomicInteger; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
  
        // Initially value as 0 
        AtomicInteger val 
            = new AtomicInteger(0); 
  
        // Updates and sets 
        int res 
            = val.getAndSet(10); 
  
        System.out.println("Previous value: "
                           + res); 
  
        // Prints the updated value 
        System.out.println("Current value: "
                           + val); 
    } 
}
輸出:
Previous value: 0
Current value: 10

示例2:

// Java program that demonstrates 
// the getAndSet() function 
  
import java.util.concurrent.atomic.AtomicInteger; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
  
        // Initially value as 18 
        AtomicInteger val 
            = new AtomicInteger(18); 
  
        // Gets and updates 
        int res = val.getAndSet(12); 
  
        System.out.println("Previous value: "
                           + res); 
        // Prints the updated value 
        System.out.println("Current value: "
                           + val); 
    } 
}
輸出:
Previous value: 18
Current value: 12

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



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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 AtomicInteger getAndSet() 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。