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import java.text.CharacterIterator;
import java.text.StringCharacterIterator;
public class Main {
public static void main(String[] argv) throws Exception {
CharacterIterator it = new StringCharacterIterator("abcd");
char ch = it.first();
ch = it.current();
ch = it.next();
ch = it.current();
ch = it.last();
int pos = it.getIndex();
ch = it.next();
pos = it.getIndex();
ch = it.previous();
ch = it.setIndex(1);
}
}
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