java 实现链表向集合转化使用toArray()

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import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

public class ArrayCollection {
    /*
    * 实现链表向集合转化使用toArray()
    */

    public static void main(String[] args) {
        List<Object> list=new ArrayList<Object>();
        Set<Object> set=new HashSet<Object>();
        list.add("aaa");
        list.add("bbb");
        list.add("ccc");
        list.add("ddd");

        Object[] obj=list.toArray();
        System.out.println(obj.length);

        String []strarr1=(String[])list.toArray(new String[0]);
        System.out.println("list exchange array1 is Length:"+strarr1.length);

        String []strarr2=(String[])list.toArray(new String[list.size()]);
        System.out.println("list exchange array2 is Length:"+strarr2.length);

        for (int i = 0; i < obj.length; i++) {
            set.add(list.get(i));
            System.out.println(set.size());
        }

        Iterator iterator=set.iterator();
        while (iterator.hasNext()) {
            System.out.println("set:"+iterator.next());

        }




//        for (int i = 0; i < list.size(); i++) {
//            set.add(obj[i]);
//        }




    }
}