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// Java Iterator interface reference:// https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.htmlclass PeekingIterator implements Iterator
   
     {    private Integer cache;    private boolean hasCache=false;    Iterator
    
      originIterator;    public PeekingIterator(Iterator
     
       iterator) {        // initialize any member here.        originIterator=iterator;    }    // Returns the next element in the iteration without advancing the iterator.    public Integer peek() {        if(hasCache)        {            return cache;        }        else        {            hasCache=true;            cache=originIterator.next();            return cache;        }    }    // hasNext() and next() should behave the same as in the Iterator interface.    // Override them if needed.    @Override    public Integer next() {        if(hasCache)        {            hasCache=false;            return cache;        }        else        {            return originIterator.next();        }    }    @Override    public boolean hasNext() {        if(hasCache)        {            return true;        }        else        {            return originIterator.hasNext();        }    }}
     
    
   

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