Java中的队列poll()方法示例
使用poll()方法获取并删除Queue中的第一个元素。
创建一个队列-
Queue<String> q = new LinkedList<String>();
添加一些元素-
q.add("abc");
q.add("def");
q.add("ghi");
q.add("jkl");
q.add("mno");
q.add("pqr");
q.add("stu");
q.add("vwx");现在，删除第一个元素-
q.poll()
以下是实现poll()方法的示例-
示例
import java.util.LinkedList;
import java.util.Queue;
public class Demo {
public static void main(String[] args) {
Queue<String> q = new LinkedList<String>();
q.add("abc");
q.add("def");
q.add("ghi");
q.add("jkl");
q.add("mno");
q.add("pqr");
q.add("stu");
q.add("vwx");
System.out.println("Queue head = " + q.element());
System.out.println("Removing element from queue = " + q.poll());
System.out.println("Queue head now = " + q.element());
System.out.println("Removing element from queue = " + q.poll());
System.out.println("Queue head now = " + q.element());
System.out.println("\nRemaining Queue elements...");
Object ob;
while ((ob = q.poll()) != null) {
System.out.println(ob);
}
}
}输出结果
Queue head = abc Removing element from queue = abc Queue head now = def Removing element from queue = def Queue head now = ghi Remaining Queue elements... ghi jkl mno pqr stu vwx