element()Java Queues中的方法用于返回容器前面的元素，并且不会删除它。
以下是一个示例。首先，创建一个队列并添加一些元素-
Queue<String> q = new LinkedList<String>();
q.offer("abc");
q.offer("def");
q.offer("ghi");
q.offer("jkl");
q.offer("mno");
q.offer("pqr");
q.offer("stu");
q.offer("vwx");现在使用element()如下所示的方法-
System.out.println("Queue head = " + q.element());以下是完整的示例-
import java.util.LinkedList;
import java.util.Queue;
public class Demo {
public static void main(String[] args) {
Queue<String> q = new LinkedList<String>();
q.offer("abc");
q.offer("def");
q.offer("ghi");
q.offer("jkl");
q.offer("mno");
q.offer("pqr");
q.offer("stu");
q.offer("vwx");
System.out.println("Queue head = " + q.element());
System.out.println("Removing element from queue = " + q.remove());
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 Remaining Queue elements... def ghi jkl mno pqr stu vwx