Iteration loop inside another loop

问题

Is there any way I can use an Iterator inside another loop? I am asking this because I can't find a way to bring the iterator at the start of the list again after the first loop is done and therefore at a second loop the iter.hasNext() will give me false

Iterator iter = list.iterator();
for (int i=0;i<30;i++)
{
 while (iter.hasNext())
 {
  ...
 }

}

回答1:

Iterator iter;
for (int i=0;i<30;i++)
{
    iter = list.iterator();
    while (iter.hasNext())
     {
      ...
     }

}

回答2:

You could just reset the iterator in the outer loop:

for (int i=0;i<30;i++) {
    Iterator iter = list.iterator();
    while (iter.hasNext()) {
        Object obj = iter.next();
    }
}

回答3:

The iterator was consumed during first cycle of a loop (i==0). To fix the problem u need to reinitialise the item reference inside a loop. Best!

来源：https://stackoverflow.com/questions/29956245/iteration-loop-inside-another-loop