1 　　　　　ArrayList<String> al=new ArrayList<String>();
2         al.add("hello");
3         al.add("world");
4         Object[] obj=al.toArray();
5         for (Object object : obj) {
6             System.out.println(object);
7         }

1          ArrayList<String> al=new ArrayList<String>();
2          al.add("hello");
3          al.add("world");
4          String []strArray=new String[1];//new String[5];
5          strArray=al.toArray(strArray);
6          for (String str : strArray) {
7              System.out.println(str);
8          }
9         

1         int [] array={11,22,33};
2         List list=Arrays.asList(array);   //[[I@1540e19d]
3         System.out.println(list);
4 
5         Integer[] array2=new Integer[]{11,22,33};     //注意要转换成包装类
6         List<Integer> list2=Arrays.asList(array2);   //[11, 22, 33]
7         System.out.println(list2);