java去除聚集中反復元素示例分享 java去除反復

class ArrayListTest1 {
    public static void main(String[] args) {
        ArrayList al = new ArrayList();
        al.add("java03");
        al.add("java03");
        al.add("java01");
        al.add("java02");
        al.add("java01");
        al.add("java02");
        al.add("java01");
        System.out.println(al);

        al = singleElement(al);
        System.out.println(al);

    }

    //前往List適合些
    public static ArrayList singleElement(ArrayList al){
      //界說一個暫時容器
      ArrayList newAl = new ArrayList();
      //在迭代是輪回中next挪用一次，就要hasNext斷定一次
      Iterator it = al.iterator();

       while (it.hasNext()){
         Object obj = it.next();//next()最好挪用一次就hasNext()斷定一次不然輕易產生異常

         if (!newAl.contains(obj))
            newAl.add(obj);
        }
        return newAl;
    }
}