List集合如何去重？

package com.xhy.xczx.test;
import java.util.*;
/**
 * 〈测试类〉
 *
 * @author Barrett
 * @version 1.0.0
 * @time 2020/1/21
 */
public class JavaTest1 {
    public static void main(String[] args) {
        /** List集合的去重 **/
        List<String> list = new ArrayList<String>();
        list.add("s1");
        list.add("s3");
        list.add("s5");
        list.add("s4");
        list.add("s4");
        list.add("s2");
        list.forEach(e -> System.out.print(e + " "));
        System.out.println();
        Set<String> linkedHashSet = new LinkedHashSet<>(list);
        List<String> list1 = new ArrayList<>();
        linkedHashSet.forEach(e -> list1.add(e));
        list1.forEach(e -> System.out.print(e + " "));
        //Java8新特性中去重方式
       list = list.stream().distinct().collect(Collectors.toList());
    }
}