如果AtomicReferenceArray對(duì)象的索引i處的當(dāng)前值等于期望值，則使用AtomicReferenceArray類(lèi)的compareAndSet()方法原子地將AtomicReferenceArray的索引i的值設(shè)置為newValue。如果更新成功，則此方法將返回true。

用法:

public final boolean

compareAndSet(

int i, E expectedValue, E newValue)

參數(shù)：此方法接受：

i這是執(zhí)行操作的AtomicReferenceArray的索引，

expectedValue這是期望值，

newValue這是要設(shè)置的新值。

返回值：如果成功，則此方法返回true；如果返回false，則表明實(shí)際值不等于期望值。

以下示例程序旨在說(shuō)明compareAndSet()方法：

程序1:

// Java program to demonstrate

// compareAndSet() method

import java.util.concurrent.atomic.*;

public class GFG {

public static void main(String[] args)

{

// create an atomic reference object.

AtomicReferenceArray ref

= new AtomicReferenceArray(3);

// set some value

ref.set(0, 1234);

ref.set(1, 4322);

// apply compareAndSet()

boolean op1

= ref.compareAndSet(0, 5434, 8913);

boolean op2

= ref.compareAndSet(1, 3236, 6543);

// print

System.out.println("Operation at index 0:"

+ op1);

System.out.println("Operation at index 0:"

+ op2);

}

}

輸出：

Operation at index 0:false

Operation at index 0:false

程序2:

// Java program to demonstrate

// compareAndSet() method

import java.util.concurrent.atomic.*;

public class GFG {

public static void main(String[] args)

{

// create an atomic reference object.

AtomicReferenceArray ref

= new AtomicReferenceArray(3);

// set some value

ref.set(0, "GFG");

ref.set(1, "JS");

// apply compareAndSet()

boolean op1

= ref.compareAndSet(

0, "GFG",

"GEEKS FOR GEEKS");

boolean op2

= ref.compareAndSet(

1, "JS",

"JAVA SCRIPT");

// print

System.out.println("Operation at index 0:"

+ op1);

System.out.println("New value at index 0:"

+ ref.get(0));

System.out.println("Operation at index 1:"

+ op2);

System.out.println("New value at index 1:"

+ ref.get(1));

}

}

輸出：

Operation at index 0:true

New value at index 0:GEEKS FOR GEEKS

Operation at index 1:true

New value at index 1:JAVA SCRIPT

創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎(jiǎng)勵(lì)來(lái)咯，堅(jiān)持創(chuàng)作打卡瓜分現(xiàn)金大獎(jiǎng)

總結(jié)

以上是生活随笔為你收集整理的java compareandset 包_Java AtomicReferenceArray compareAndSet()用法及代码示例的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。

如果覺(jué)得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。