使用LinkedHashSet给ArrayList去重并保持顺序

import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;

public class Distinct {

public static void main(String[] args) {
List<String> list = new ArrayList<String>();
list.add("1");
list.add("2");
list.add("3");
list.add("4");
list.add("1");
list.add("2");
list.add("7");

List<String> listWithoutDup = new ArrayList<String>(new LinkedHashSet<String>(list));

System.out.println("list: "+ list);
System.out.println("list without dup: "+ listWithoutDup);

}
}