Java.util.concurrent.atomic.AtomicIntegerArray.compareAndSet()是Java中的一种内置方法,如果当前值等于期望值,则该方法原子地将元素设置在给定的更新值。此方法将索引值,期望值和更新值作为参数,并返回一个布尔值,说明该值是否已更新。
用法:
public final boolean compareAndSet(int i, int expect, int update)
参数:该函数接受三个参数:
- i:要进行操作的索引。
- expect:要检查的期望值是否等于当前值。
- update:要更新的值。
返回值:该函数返回一个布尔值,说明该值是否已更新。如果成功,则返回true,否则返回false,指示当前值不等于期望值。
以下示例程序旨在说明上述方法:
示例1:
// Java program that demonstrates
// the compareAndSet() function
import java.util.concurrent.atomic.AtomicIntegerArray;
public class GFG {
public static void main(String args[])
{
// Initializing an array
int a[] = { 1, 2, 3, 4, 5 };
// Initializing an AtomicIntegerArray with array a
AtomicIntegerArray arr = new AtomicIntegerArray(a);
// Displaying the AtomicIntegerArray
System.out.println("The array : " + arr);
// Index where operation is performed
int idx = 3;
// Value to expect at idx
int expect = 4;
// Value to update if current value
// is equal to expected value
int update = 40;
// Updating the value at idx
// applying compareAndSet
arr.compareAndSet(idx, expect, update);
// Displaying the AtomicIntegerArray
System.out.println("The array after update : "
+ arr);
}
}
The array : [1, 2, 3, 4, 5] The array after update : [1, 2, 3, 40, 5]
示例2:
// Java program that demonstrates
// the compareAndSet() function
import java.util.concurrent.atomic.AtomicIntegerArray;
public class GFG {
public static void main(String args[])
{
// Initializing an array
int a[] = { 1, 2, 3, 4, 5 };
// Initializing an AtomicIntegerArray with array a
AtomicIntegerArray arr = new AtomicIntegerArray(a);
// Displaying the AtomicIntegerArray
System.out.println("The array : " + arr);
// Index where operation is performed
int idx = 3;
// Value to expect at idx
int expect = 40;
// Value to update if current value
// is equal to expected value
int update = 4;
// Updating the value at
// idx applying compareAndSet
arr.compareAndSet(idx, expect, update);
// Displaying the AtomicIntegerArray
System.out.println("The array after update : "
+ arr);
}
}
The array : [1, 2, 3, 4, 5] The array after update : [1, 2, 3, 4, 5]
参考:Java.util.concurrent.atomic.AtomicIntegerArray.compareAndSet()是Java中的一种内置方法,如果当前值等于预期值,则该方法原子地将元素设置在给定的更新值。此方法将索引值,期望值和更新值作为参数,并返回一个布尔值,说明该值是否已更新。
用法:
public final boolean compareAndSet(int i, Integer expect, Integer update)
参数:该函数接受三个参数:
- i:要进行操作的索引。
- expect:要检查的期望值是否等于当前值。
- update:要更新的值。
返回值:该函数返回一个布尔值,说明该值是否已更新。如果成功,则返回true,否则返回false,指示当前值不等于期望值。
以下示例程序旨在说明上述方法:
示例1:
// Java program that demonstrates
// the compareAndSet() function
import java.util.concurrent.atomic.AtomicIntegerArray;
public class GFG {
public static void main(String args[])
{
// Initializing an array
Integer a[] = { 1, 2, 3, 4, 5 };
// Initializing an AtomicIntegerArray with array a
AtomicIntegerArray arr = new AtomicIntegerArray(a);
// Displaying the AtomicIntegerArray
System.out.println("The array : " + arr);
// Index where operation is performed
int idx = 3;
// Value to expect at idx
Integer expect = 4;
// Value to update if current value
// is equal to expected value
Integer update = 40;
// Updating the value at idx
// applying compareAndSet
arr.compareAndSet(idx, expect, update);
// Displaying the AtomicIntegerArray
System.out.println("The array after update : "
+ arr);
}
}
The array : [1, 2, 3, 4, 5] The array after update : [1, 2, 3, 40, 5]
示例2:
// Java program that demonstrates
// the compareAndSet() function
import java.util.concurrent.atomic.AtomicIntegerArray;
public class GFG {
public static void main(String args[])
{
// Initializing an array
Integer a[] = { 1, 2, 3, 4, 5 };
// Initializing an AtomicIntegerArray with array a
AtomicIntegerArray arr = new AtomicIntegerArray(a);
// Displaying the AtomicIntegerArray
System.out.println("The array : " + arr);
// Index where operation is performed
int idx = 3;
// Value to expect at idx
Integer expect = 40;
// Value to update if current value
// is equal to expected value
Integer update = 4;
// Updating the value at
// idx applying compareAndSet
arr.compareAndSet(idx, expect, update);
// Displaying the AtomicIntegerArray
System.out.println("The array after update : "
+ arr);
}
}
The array : [1, 2, 3, 4, 5] The array after update : [1, 2, 3, 4, 5]
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