無法調用類型T []

迭代器我想遍歷結構的一個實例方法內我的數據結構的元素。這裏是我的數據結構和它的方法代碼：無法調用類型T []

import java.util.Iterator; 

public class DropOutStackArray<T> implements DropOutStack<T>{ 

    private static final int CAP = 10; 
    private int bottom, top, size; 
    private T[] cstack; 


    public static void main(String[] args){ 
     //System.out.println(2%10); 
     //int[] a = new int[10]; 
     //System.out.println(a.length); 
    } 

    private class MyIterator implements Iterator<T>{ 

     private int curr = 0; 

     @Override 
     public boolean hasNext() { 
      return this.curr != DropOutStackArray.this.size; 
     } 

     @Override 
     public T next() { 
      if(hasNext()){ 
       return cstack[curr++]; 
      } 
      return null; 
     } 

     public void remove(){ 
      if(curr == 0) 
       return; 
      cstack[--curr] = cstack[--size]; 
      cstack[curr] = null; 
     } 
    } 

    @Override 
    public Iterator<T> iterator() { 
     // TODO Auto-generated method stub 
     return new MyIterator(); 
    } 

    public DropOutStackArray(){ 
     this.cstack = (T[]) new Object[CAP]; 
     this.bottom = 0; this.top = 0; 
     this.size = 0; 

    } 

    public DropOutStackArray(final int INCAP){ 
     this.cstack = (T[]) new Object[INCAP]; 
     this.bottom = 0; this.top = 0; 
     this.size = 0; 
    } 

    @Override 
    public void push(T data) { 
     // TODO Auto-generated method stub 
     if(this.size == this.cstack.length){ 
      this.cstack[bottom] = data; 
      this.bottom = (this.bottom + 1) % this.cstack.length; 
      this.top = (this.top + 1) % this.cstack.length; 

     } 
     this.cstack[this.top] = data; 
     this.top = (this.top + 1) % this.cstack.length; 
     this.size++; 
    } 


    @Override 
    public T pop(){ 
     T popped; 
     if(!isEmpty()){ 
      int length = this.cstack.length; 
      this.top = (this.top + length - 1) % length; 
      popped = this.cstack[this.top]; 
      this.cstack[this.top] = null; 
      this.size--; 
     }else{ 
      throw new StackEmptyException(); 
     } 
     return popped; 
    } 


    @Override 
    public T peek() { 
     // TODO Auto-generated method stub 
     if(isEmpty()){ 
      throw new StackEmptyException(); 
     } 
     T peeked = this.cstack[this.top-1]; 
     return peeked; 
    } 


    @Override 
    public int size() { 
     return this.size; 
    } 


    @Override 
    public boolean isEmpty() { 
     if(this.size == 0){ 
      return true; 
     } 
     return false; 
    } 

    public String toString(){ 
     Iterator<T> itr = this.cstack.iterator(); 
    } 
}

我的問題是在最後的方法 - toString（）。當我嘗試創建itr時，會在標題中發佈錯誤。爲什麼我不能在堆棧上調用迭代器？

來源

2014-10-05 Jeremy Fisher

我假設數組不提供迭代器。這裏有一個類似的問題：http://stackoverflow.com/questions/3912765/iterator-for-array – 2014-10-05 22:43:55

不幸的是我不能使用任何集合接口。我寫了自己的迭代器類，我不得不使用它。 – 2014-10-05 22:45:05

您的兩個方法toString()和iterator()都是DropOutStackArray<T>類中的實例方法。

所以，你應該改變以下 -

Iterator<T> itr = this.cstack.iterator();

到

Iterator<T> itr = this.iterator();

來源

2014-10-05 22:49:57

無法調用類型T []

回答

相關問題