这个 大小() 方法 ConcurrentLinkedQueue 用于返回此ConcurrentLinkedQueue包含的元素数。
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语法:
public int size()
返回: 这种方法 元素数 在这个ConcurrentLinkedQueue中。
下面的程序演示了ConcurrentLinkedQueue的size()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" + "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/concurrent/ConcurrentLinkedQueue.html#size–
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