java去除重复字符串

如何去除重复的字符串? 可以考虑考虑集合是如何保证元素不重复的。作为参考! package  www.wlkankan.cn public class Test {     private static final Object object = new Object();     public static void main(String[] args) {         //利用map的key不能重复         Map<Object, Object> map = Maps.newLinkedHashMap();         //将字符串进行肢解         char[] str = "abcdefgabcdefgoop".toCharArray();         //将直接后的内容用作map的key         for (int i = 0; i < str.length; i++)             map.put(str[i], object);         //最终的字符串         StringBuilder builder = new StringBuilder();         //便利最后获得到的map,重新组装到字符串         for (Map.Entry<Object, Object> entry : map.entrySet())         builder.append(entry.getKey());         System.out.println(builder.toString());     } }