TreeSet

import java.util.Iterator;

import java.util.TreeSet;

public class TreeSetTest {

String list[] = {"Java", "자바", "홍길동", "Spring", "1234", "Java", "자바", "홍길동", "Spring", "1234"};

public TreeSetTest() {

//중복제거, 정렬

TreeSet<String> ts = new TreeSet<String>();

for(int i=0; i<list.length; i++){

ts.add(list[i]);

}

//출력

Iterator<String> ii = ts.iterator();

while(ii.hasNext()){

System.out.println(ii.next());

}

System.out.println("==========");

//역순으로 객첵루하기

Iterator<String> iii = ts.descendingIterator();

while(iii.hasNext()){

System.out.println(iii.next());

}

}

public static void main(String[] args) {

new TreeSetTest();

}

}