Java 中的 ConcurrentLinkedQueue size()方法
原文:https://www . geeksforgeeks . org/concurrentlinkedqueue-size-method-in-Java/
ConcurrentLinkedQueue 的 size() 方法用于返回该 ConcurrentLinkedQueue 包含的元素数量。
语法:
public int size()
返回:这个方法这个 ConcurrentLinkedQueue 中的元素数量。
下面的程序说明了并发链接队列的大小()方法:
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<Integer>
queue = new ConcurrentLinkedQueue<Integer>();
// 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
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<String>
queue = new ConcurrentLinkedQueue<String>();
// 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://docs . Oracle . com/javase/8/docs/API/Java/util/concurrentlinkedqueue . html # size–
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