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Java AtomicBoolean getAndSet()用法及代碼示例


Java.util.concurrent.atomic.AtomicBoolean.getAndSet()是Java中的一種內置方法,該方法將給定值設置為參數中傳遞的值,並在更新前返回該值,該值是布爾值類型。

用法:

public final boolean getAndSet(boolean 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。

以下示例程序旨在說明上述方法:

示例1:

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

示例2:

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

參考: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicBoolean.html#getAndSet-boolean-



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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 AtomicBoolean 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。