list去重排序

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.TreeSet;

public class TestAnother {
    public static void main(String[] args) {
        List list = new ArrayList();
        list.add("1");
        list.add("2");
        list.add("2");
        list.add("3");
        list.add("3");
        list.add("4");
        TreeSet treeSet=new TreeSet(list);
        for (Iterator iterator = treeSet.iterator(); iterator.hasNext();) {
            System.out.println(iterator.next());
        }
    }
}