如果AtomicReferenceArray對象的索引i處的當前值等于期望值，則使用AtomicReferenceArray類的compareAndSet()方法原子地將AtomicReferenceArray的索引i的值設置為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：此方法接受：

i這是執行操作的AtomicReferenceArray的索引，

expectedValue這是期望值，

newValue這是要設置的新值。

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

以下示例程序旨在說明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

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