StringUtils.Join은 StringCharacterIterator를 수락 할 수없는 이유는 무엇입니까?

Question

join는 반복자를 인수로 받아들이므로 다음 코드가 작동해야합니다.

import static org.apache.commons.lang.StringUtils.join;
import java.text.StringCharacterIterator;

…

join(new StringCharacterIterator("A String"), " ");

.

alas, 그렇지 않습니다.누군가 나에게 왜 설명 할 수 있니?

Answer 1

According to the documentation, StringCharacterIterator inherits from and only from CharacterIterator. A CharacterIterator does not inherit from a generic Iterator, which is what join wants.

http://download.oracle.com/javase/1.4.2/docs/api/java/text/CharacterIterator.html

Answer 2

First of all, the join method takes two arguments : an iterator and a separator string or char.

And if you look at the javadoc of StringCharacterIterator, you'll see that this class does not implement java.util.Iterator.