问有没有人能把我的deque代码快速看一遍？

EN

    public class ArrayBasedDeque<EltType> implements Deque<EltType> {

  private final int CAPACITY = 10;
  private int capacity;
  private int end;
  private EltType deque[];  

  public ArrayBasedDeque() {
    this.capacity = CAPACITY;
    deque = (EltType[]) (new Object[capacity]);  
  }
  public EltType first() {
    return  deque[0];
  }
  public EltType last() {
    return deque[end-1];
  }

  public boolean isEmpty() {
    return end == 0;
  }

  public int size() {
   return deque.length;
  }

  public boolean isFull() {
   return end == capacity;
  }
  public void insertFirst(EltType inserted) {
    if (!isEmpty()) {
    EltType[] tempArray;
    capacity+=1;
    tempArray = (EltType[]) new Object[capacity];
    for(int i=0;i<end;i++){
    tempArray[i+1] = deque[i]; 
    }
    deque=tempArray;
    }
    deque[0] = inserted;
    end++;
    }

  public void insertLast(EltType last) {
    if (isFull()){
          EltType[] tempArray;
          capacity+=1;
      tempArray = (EltType[]) new Object[capacity];
      for (int i=0;i<end;i++) {
        tempArray[i] = deque[i]; 
      }
//      System.out.print(deque[end]);
    }
    deque[end] = last;   
    end++;
  }

  public EltType removeFirst() {
    EltType[] tempArray;
    EltType returned = deque[0];
    tempArray = (EltType[]) new Object[capacity];
      for (int i=1;i<capacity;i++) {
        tempArray[i-1] = deque[i]; 
      }
      deque = tempArray;
      end--;
    return returned;
  }

  public EltType removeLast() {
    EltType[] tempArray;
    EltType returned = deque[end-1];

    tempArray = (EltType[]) new Object[capacity];
      for (int i=0;i<capacity;i++) {
        tempArray[i] = deque[i]; 
      }
      deque = tempArray;
      end--;
    return returned;
  }




}