java list 去重

java 可通过HashSet踢除重复元素,代码如下

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;

public class RemoveDuplicate {


    public static void main(String[] args) {
        List list = new ArrayList();
        list.add(1);
        list.add(2);
        list.add(3);
        list.add(4);
        list.add(1);
        list.add(1);
        List result = removeDuplicate(list);
        System.out.println(result);
    }
    public static List removeDuplicate(List list){

        HashSet h = new HashSet(list);
        list.clear();
        list.addAll(h);
        return list;
    }
}

执行结果如下:

[1, 2, 3, 4]