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import java.util.LinkedList;  
//µ¥Ïò¶ÓÁР 
public class Queue {  
    public Queue() {  
    }  
    private LinkedList list = new LinkedList();  
    public void put(Object v) {  
        list.addFirst(v);  
    }  
    public Object get() {  
        return list.removeLast();  
    }  
    public boolean isEmpty() {  
        return list.isEmpty();  
    }  
}
import java.util.Collection;  
import java.util.Iterator;  
import java.util.LinkedList;  
// Ë«Ïò¶ÓÁР 
public class DQueue implements Collection {  
    private LinkedList lists;  
    public DQueue() {  
        lists = new LinkedList();  
    }  
    public void put_front(Object v) {  
        lists.addFirst(v);  
    }  
    public void put_back(Object v) {  
        lists.addLast(v);  
    }  
    public Object get_front() {  
        return lists.removeFirst();  
    }  
    public Object get_Back() {  
        return lists.removeLast();  
    }  
    public boolean isEmpty() {  


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class FileTest
{
 public static void main(String[] args) throws Exception
 {
  //File f=new File("1.txt");
  //f.createNewFile();
  //f.mkdir();
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