Java.util.concurrent.atomic.AtomicIntegerArray.getAndSet()是Java中的一種內置方法,該方法原子地在AtomicIntegerArray的任何給定位置設置給定值。該方法采用AtomicIntegerArray的索引值和要設置為參數的值。在給定索引處設置新值之前,它將返回給定索引處的值。函數getAndSet()與set()函數相似,但前者返回值,而後者不返回任何值。
用法:
public final int getAndSet(int i, int newValue)
參數:該函數接受兩個參數:
- i–要進行更新的索引。
- newValue–在索引i處設置的值
返回值:函數以整數形式返回更新前給定索引處的值。
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.AtomicIntegerArray;
public class GFG {
public static void main(String args[])
{
// Initializing an array
int a[] = { 11, 12, 13, 14, 15 };
// 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 = 0;
// New value to set at idx
int val = 100;
// Updating the value at
// idx applying getAndSet
// and store previous value
int prev = arr.getAndSet(idx, val);
// Previous value at idx before update
System.out.println("Value at index " + idx
+ " before the update is "
+ prev);
// Displaying the AtomicIntegerArray
System.out.println("The array after update : "
+ arr);
}
}
輸出:
The array : [11, 12, 13, 14, 15] Value at index 0 before the update is 11 The array after update : [100, 12, 13, 14, 15]
示例2:
// Java program that demonstrates
// the getAndSet() function
import java.util.concurrent.atomic.AtomicIntegerArray;
public class GFG {
public static void main(String args[])
{
// Initializing an array
int a[] = { 11, 12, 13, 14, 15 };
// 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;
// New value to set at idx
int val = 10;
// Updating the value at
// idx applying getAndSet
// and store previous value
int prev = arr.getAndSet(idx, val);
// Previous value at idx before update
System.out.println("Value at index " + idx
+ " before the update is "
+ prev);
// Displaying the AtomicIntegerArray
System.out.println("The array after update : "
+ arr);
}
}
輸出:
The array : [11, 12, 13, 14, 15] Value at index 3 before the update is 14 The array after update : [11, 12, 13, 10, 15]
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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 AtomicIntegerArray 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。