List去除重复数据问题

Question

List存放了{1,2} {2,3} {3,2}
我只想输出{1,2} {2,3}

Answer 1

[code="java"]public class dropList {

public static void main(String[] args) {
    String[][] mylist = new String[][]{{"1","2"},{"3","2"},{"2","3"}};
    List<String[]> list = Arrays.asList(mylist); 
    TreeSet<String[]> ts  = new TreeSet<String[]>(new Comparator<String[]>(){

        @Override
        public int compare(String[] o1, String[] o2) {
            TreeSet<String> set1 = new TreeSet<String>(Arrays.asList(o1));
            TreeSet<String> set2 = new TreeSet<String>(Arrays.asList(o2));
            Collection<String> sub =  CollectionUtils.disjunction(set1, set2);
            if (sub.size()==0) {
                return 0;
            }
            String p = sub.iterator().next();
            if(set1.contains(p)){
                return 1;
            }
            return -1;
        }

    });

    ts.addAll(list);
    for(String[] temp : ts ){
        System.out.println(Arrays.toString(temp));
    }
}

}
[/code]