怎么用Java编入队

怎么用Java编入队

import java.util.Queue;
import java.util.LinkedList;
public class TestQueue {
public static void main(String[] args) {
Queue queue = new LinkedList();
queue.offer("Hello");
queue.offer("World!");
queue.offer("你好！");
System.out.println(queue.size());
String str;
while((str=queue.poll())!=null){
System.out.print(str);
}
System.out.println();
System.out.println(queue.size());
}
}