Question

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foreach loop a java creation?

I am learning a Java program. But something , I don’t understand. It is following:

for(Some obj : vc) {
  System.out.println(obj.getResult());

I tried to search “for-loop” in my book and google. They just had some basic method.

What means about “for(Some obj : vc)”?

Thanks a lot!

Answer 1

It’s a for-each loop, introduced in Java 1.5.

You can read it as “For each Some in vc“.

It’s effectively the same as using an iterator like so:

for(Iterator<Some> i = vc.iterator(); i.hasNext();) {
  Some obj = i.next();
  System.out.println(obj.getResult());
}

Only with less bloat.

Also, note that this syntax isn’t limited to things that are Iterable. This would also work if vc were an array of Some (i.e. Some[]).