向foreach循环添加其他参数

Question

I have a foreach loop that goes

boolean doesWordMatch = false;
for(Character[] charArr : charSets)
{
  if(doesWordMatch)
    //dosomething
  else
    break;
}

I was wondering, is there anyway to put the condition into the for loop? eg

for(Character[] charArr : charSets && doesWordMatch == true)
{
  //dosomething
}

edit-- Right, so would this be possible in a while loop? :o

Answer 1

No, this cannot be done in an enhanced for-loop .

You could try the following:

for (Character[] charArr : charSets) {
    if (!doesWordMatch) {
        break;
    }
    //do interesting things
}

I believe this is also more concise than having everything in the looping declaration.

Answer 2

If you just want the "if" block out of the for loop, then you can do it the old-fasioned way.

Iterator<Character[]> i=charSets.iterator();
for(Character[] charArr=i.next(); i.hasNext() && doesWordMatch == true; charArr=i.next() ) {
        // do something
}

Answer 3

If what you want is to create a mapping between charArr and doesWordMatch :

Map<Character[], Boolean> map = new HashMap<>();
map.put(charArr, doesWordMatch);

for(Map.Entry<Character[], Boolean> myEntry : map.entrySet()) {
    if(myEntry.getValue()) {
        // do something with myEntry.getKey();
    } else {
        break;
    }
}

I'm not sure if that's what you're looking for, but I can't think of any other reason for wanting the doesWordMatch variable into the loop. In this case, doesWordMatch can be different for each charArr .

Answer 4

Use an iterator and a standard for-loop with a blank increment statement:

Character[] curr;
for(Iterator<Character[]> iter = charSets.iterator(); iter.hasNext() && doesWordMatch;) {
  curr = iter.next();
  // ...
}

Answer 5

Will the boolean variable doesWordMatch change in the for-loop?

If not, I would suggest:

if(doesWordMatch)
  for(Character[] charArr : charSets)
  {
    //dosomething
  }
}