Java中的 ConcurrentLinkedQueue size() 方法
ConcurrentLinkedQueue的size()方法用于返回此 ConcurrentLinkedQueue 包含的元素数。
句法:
public int size()
返回:此方法此 ConcurrentLinkedQueue中的元素数。
下面的程序说明了 ConcurrentLinkedQueue 的 size() 方法:
示例 1:
// Java Program Demonstrate size()
// method of ConcurrentLinkedQueue
import java.util.concurrent.*;
public class GFG {
public static void main(String[] args)
{
// create an ConcurrentLinkedQueue
ConcurrentLinkedQueue
queue = new ConcurrentLinkedQueue();
// Add Numbers to queue
queue.add(4353);
queue.add(7824);
queue.add(78249);
queue.add(8724);
// Displaying the existing ConcurrentLinkedQueue
System.out.println("ConcurrentLinkedQueue: " + queue);
// apply size()
int size = queue.size();
// print after applying size method
System.out.println("Size of ConcurrentLinkedQueue: " + size);
}
}
输出:
ConcurrentLinkedQueue: [4353, 7824, 78249, 8724]
Size of ConcurrentLinkedQueue: 4
示例 2:
// Java Program Demonstrate size()
// method of ConcurrentLinkedQueue
import java.util.concurrent.*;
public class GFG {
public static void main(String[] args)
{
// create an ConcurrentLinkedQueue
ConcurrentLinkedQueue
queue = new ConcurrentLinkedQueue();
// Add String to queue
queue.add("Aman");
queue.add("Amar");
queue.add("Sanjeet");
queue.add("Rabi");
// Displaying the existing ConcurrentLinkedQueue
System.out.println("ConcurrentLinkedQueue: " + queue);
// apply size() on queue
int size = queue.size();
// print after applying size method
System.out.println("Size of ConcurrentLinkedQueue: "
+ size);
// removal of some elements
queue.poll();
queue.poll();
// get size of ConcurrentLinkedQueue again
size = queue.size();
// Displaying the existing ConcurrentLinkedQueue
System.out.println("After 2 removal of elements\n"
+ "ConcurrentLinkedQueue: " + queue);
// print after applying size method
System.out.println("Size of ConcurrentLinkedQueue: "
+ size);
}
}
输出:
ConcurrentLinkedQueue: [Aman, Amar, Sanjeet, Rabi]
Size of ConcurrentLinkedQueue: 4
After 2 removal of elements
ConcurrentLinkedQueue: [Sanjeet, Rabi]
Size of ConcurrentLinkedQueue: 2
参考: https: Java/util/concurrent/ConcurrentLinkedQueue.html#size–