java list用法,去除字符串数组中重复值

import java.util.Arrays;
import java.util.List;
import java.util.LinkedList;

public class tests {

public static List printMap1(String[] s) {
List<String> list = new LinkedList<String>();
List<String> list2 = Arrays.asList(s);
list.addAll(list2);
return list;

}

public static String[] array_unique(String[] a) {
// array_unique
List<String> list = new LinkedList<String>();
for(int i = 0; i < a.length; i++) {
if(!list.contains(a[i])) {
list.add(a[i]);
}
}
return (String[])list.toArray(new String[list.size()]);
}

public static void main(String[] args) {
String[] ar = {"dd","cc","ee","ff","gg","cc","ee"};
String[] s = array_unique(ar);
for(String aa : s) {
System.out.println(aa);
}
List list3 = printMap1(ar);
for(Object o : list3) {
System.out.println(o);
}
}
}