java - 双面队列问题

Question

我正在尝试运行此方法以将通用值(EltType)插入双面队列(deque)中，但我不断收到我无法弄清楚的 outOfBoundsException 。有人可以帮我解决这个问题吗？这只是代码的摘录，但我认为可以从中拼凑出来!

  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 void insertFirst(EltType first) {
        if(!isEmpty()) {
        EltType[] tempArray;
        tempArray = (EltType[]) new Object[CAPACITY+1];
        for (int i=0;i<=deque.length;i++) {
          tempArray[i+1] = deque[i]; 
        }
        deque = tempArray; 
        }
       deque[0] = first;
      }

  public boolean isEmpty() {
    boolean returned;
    if (deque.length < 1) {
     returned = true; 
    }else {
     returned = false; 
    }
    return returned;
  }

错误:

java.lang.ArrayIndexOutOfBoundsException: 10
    at ArrayBasedDeque.insertFirst(ArrayBasedDeque.java:48)
    at TestABD.main(TestABD.java:5)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:271)

Answer 1

除了关于 <= 的其他答案，您将临时数组大小设置为 CAPACITY+1，它始终为 11。您的意思可能是:

tempArray = (EltType[]) new Object[capacity+1];