public class TestQueue {  
    public static void main(String[] args) {  
    //關於使用佇列
        Queue<String> queue = new LinkedList<String>();  
        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());  
    }  
}